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AC INVERTER VF 8Z Instruction Manual Read this manual carefully before attempting to operate the inverter and store it for future reference.

Nais vf 8 z manual

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Page 1: Nais vf 8 z manual

AC INVERTER

VF 8ZInstruction Manual

Read this manual carefully beforeattempting to operate the inverterand store it for future reference.

Page 2: Nais vf 8 z manual

1

The variety of uses for this equipment and difference between this solid stateequipment and electromechanical equipment, means that the user of and thoseresponsible for the applying of this equipment must ensure that the applicationand use of this product is acceptable and safe. Under no circumstances willMatsushita Electric Works, Ltd. (MEW) be responsible or liable for indirect orconsequential damages resulting from the use of application of this equipment.

The diagrams and illustrations within this manual are solely intended to illustratethe text of this document. Such are the variables associated with the applicationof this product to any given installation, that the MEW can not assumeresponsi-bility or liability for actual use based on the illustrated uses andapplications shown herein.

No patent liability is assumed by MEW with concern to the use of information,equipment or circuits outlined in this text.

Reproduction of this manual in whole/part or otherwise is prohibited without theexpress permission of MEW.

Please follow the information and instructions as laid out in this manual carefullyto avoid damage to equipment or risk to personal injury.

ATTENTION ;Indicate situations that could lead to personal injury or death,property damage or financial loss.

Attention will help the user to :Identify hazard.Avoid hazard.Realize the consequences of ignoring the warnings given.

Handle all warning indications 危険 CAUTION to the equipment

in the same manner as ATTENTION.

Important User Information

Page 3: Nais vf 8 z manual

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1. PREFACE

Important information relative to this manual# Manufactures and their respective engineering departments responsible fordesign and specification of electrical control equipment must refer to applicableindustry standards and codes for specific safety guidelines and interface re-quirements.# The installer/user of this product is responsible to assume compliance withappropriate machine and operator safety codes or regulations within the factoryenvironment which are beyond the scope and purpose of this documents.

General precautions.Added to the precautions listed within this document.The following statements common to the system must be read and understood.

ATTENTION ; Only qualified personnel familiar with the VF-8Z and itsapplication should plan, install, start up or maintain the system.Failure to comply may result in personal injury and/or equipment damage.

ATTENTION ; This assembly contains parts that may be sensitive to staticdischarge. Static control precautions will be required if performing repairs,tests or servicing of this equipment, otherwise component damage mayresult.

ATTENTION ; A product that has been incorrectly applied or installed couldresult in component damage and a reduction in product life. Malfunction ofsystem may be as a result of wiring or application errors, such as incorrector inadequate AC supply, excessive temperature or an undersized motor.

Page 4: Nais vf 8 z manual

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Read this manual and related documents before attempting to install, operate,service or inspect this inverter.Make sure that you have an understanding of the device, the safety informationand all precautions before starting use.

1. INSTALLATION

ATTENTION

(See page 10)

Install the unit on a non-combustible material such as metal.Installing it on other material could lead to fires.

Do not place the unit near flammable materials.Doing so could lead to fires.

Do not hold by the cover during transportation.Doing so could cause the unit to drop and lead to injuries.

Do not allow foreign matter such as metal swarf enter the unit.Entry of this type of matter could lead to fires.

Install the unit according to the instruction manual on a place where theweight can be withstood.Failure to do so could lead to dropping of the unit and to injuries.

Do not install or operate an inverter that is damaged or missing parts.Doing so could lead to injuries.

Safety Precautions

Page 5: Nais vf 8 z manual

4

2. WIRING

ATTENTION

(See page 17)

Always confirm that the input power is OFF before starting wiring.Failure to do so could lead to electric shocks or fires.

Always connect the earth.Failure to do so could lead to electric shocks or fires.

Wiring work must be carried out by a qualified technician.Failure to do so could lead to electric shocks or fires.

Always install the unit before wiring.Failure to do so could lead to electric shocks or fire.

ATTENTION

(See page 17)

Do not connect an AC power supply to the output terminals(U/T1, V/T2, W/T3).Doing so could lead to injuries or fire.

Confirm that the product's rated voltage and the AC power supply voltagematch.Failure to do so could lead to injuries or fire.

Do not connect a braking resistor other than the braking resistordesignated by MEW (exclusive option) to the braking resistor terminals(DB+. DB–).Doing so could lead to fires.

Tighten the terminal screws to the designated tightening torque.Failure to do so could lead to fire.

Page 6: Nais vf 8 z manual

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3. OPERATION

ATTENTION

Always fit the cover before turning the input power ON. Do not remove thecover while the power is ON.Doing so could lead to electric shock. (See page 22)

Do not operate the push-buttons with wet hands.Doing so could lead to electric shock. (See page 22)

Do not touch the inverter terminals when the inverter power is ON or evenwhen the inverter is stopped.Doing so could lead to electric shock. (See page 22)

The STOP button is not designed for emergency stop purposes. Preparea separate emergency stop button.Failure to do so could lead to injury. (See page 22)

Depending on the start mode and ride-through function settings, if the runsignal is on and the power is turned ON or the power is restored after apower failure, the unit may start (restart) suddenly. Bear this in mindbefore conducting maintenance.(Design the machine so that personel safety can be ensured even if theunit starts suddenly.)Failure to do so could lead to injury. (See pages 44 and 45)

Depending on the start mode function setting, if the fault trip is reset withthe run signal present, the unit may restart suddenly.(Reset the trip after ensuring personel safety.)Failure to do so could lead to injury. (See page 44)

The heat sink fins can reach high temperatures, so allow to cool beforetouching.Doing so could lead to burns. (See page 22)

The inverter can be easily set to run from low speeds to high speeds.Confirm the tolerable range of the motor and machine before startingoperation.Failure to do so could lead to injury. (See page 22)

Prepare holding brakes when required.Failure to do so could lead to injury. (See page 22)

Page 7: Nais vf 8 z manual

6

4. MAINTENANCE, INSPECTION AND PART REPLACEMENT ATTENTION

(See pages 70 and 72) Wait at least five minutes after turning the input power OFF before starting

inspection.(Also confirm that the CHARGE lamp has gone out.)Failure to do so could lead to electric shock.

Maintenance, inspection and part replacement must be done by qualifiedpersons.[Remove all metal personal belongings (watches, bracelets, etc.) beforestarting the work.] (Use tools treated with insulation.)Failure to do so could lead to electric shocks or injury.

Have an electrician periodically tighten the terminal screws.Loosening of the terminal screws could lead to overheating or fire.

5. OTHERS

ATTENTION

(See page 72)

Never modify the unit.Doing so could lead to electric shock or injury.

General Precautions

All diagrams in this instruction manual show the state with the cover orsafety partitions removed to explain the details. Before operating theproduct, replace the covers and partitions to the positions specified, andoperate the unit according to the instruction manual.

Page 8: Nais vf 8 z manual

7

Special Precautions ........................................................................ 8

Installation ...................................................................................... 10

Outline Dimensions ........................................................................ 11

Parts Identification .......................................................................... 13

Main Circuit Wiring ......................................................................... 17

Control Circuit Wiring ..................................................................... 20

Basic Operation .............................................................................. 22

Monitoring ....................................................................................... 24

Setting and Changing Functions .................................................... 25

Functional Descriptions (Parameter Table) .................................... 28

Functional Descriptions (By Parameter No.) .................................. 31

To Effectively Use the Inverter ....................................................... 53

Troubleshooting ① ......................................................................... 69

Troubleshooting ② ......................................................................... 71

Maintenance and Inspection (Precautions) .................................... 72

Maintenance and Inspection (Inspection Table) ............................ 74

Specifications ................................................................................. 76

Contents

Page 9: Nais vf 8 z manual

8

Use your inverter only within ambient temperature variations. –10°C to +40°C

Because the life of the inverter is greatly affected by ambient temperature, do notuse it outside the specification. Also, pay attention to the installation direction'sand conditions. (See page 10.)

Do not attempt insulation testing between the inverter cables.

To measure the insulation resistance of the power supply cables or the motorcables, disconnect them from the inverter. Never conduct insulation testing onthe control circuits. (However, insulation testing can be performed between thecharging unit and the ground.)

Never touch the inside of the inverter during operation.

This is extremely dangerous the inverter contains high-voltage circuitry. Be sureto wait at least 5 minutes after the inverter has been turned off, before making aninternal check.Do not touch the aluminum diecast heat fins as they become hot duringoperation.

Radio interference

The main circuit of the inverter contains a harmonic component and mayinterfere with communications equipment such as AM radios if these are usednearby. The amount of radio interference depends on the field strength in thearea where the inverter is used. While it is difficult to completely eliminate radiointerference, it may be reduced by changing the angle of your radio antenna,using a noise filter with the inverter, housing the inverter in a metallic shield box,or routing inverter cables in metal conduit.

If a magnetic contactor is connected to the power supply side of theinverter, never use it to start or stop the motor (inverter).

Switching the inverter on and off frequently by a magnetic contactor in theprimary side, can cause the inverter to malfunction. Do not turn the inverter loadon and off during operation as this causes inverter fault trips. Turn the inverter onand off only by means of its operation signals.

Special Precautions

Page 10: Nais vf 8 z manual

9

The inverter will be damaged if the power supply voltage is applied toits output terminals.

Applying power to the U, V or W output terminalwill damage the inverter. Check for miswiring ofpower and control circuit of the application system.Never apply a voltage that exceeds the voltagelimitations of the inverter.

Do not connect a power factor correction capacitor or suppressor tothe output terminal of the inverter.

Such devices can damage theinverter, its capacitors and otherparts. Remove the device if one isconnected.

Do not use the inverter to drive any load (voltage regulator,electromagnet, etc.) other than a motor.

Single-phase motors cannot be used with the inverter.

Precautions regarding inverter's protection function

Various protection functions, such as stall prevention, current limiting andovercurrent protection, are incorporated in the inverter.These protection functions are used to protect the inverter from unexpectedfaults that could occur during use of the inverter, and are not the controlfunctions normally used.Thus, during normal usage, avoid applications that activate these protectionfunctions.Depending on the state, the inverter life could drop, or damage could occur.Before using the inverter, measure the output current, etc., with a measuringinstrument, and check the details of the fault trip memory. Make sure that thereare no problems in respect to the all precautions listed in the instruction manualand in respect to the product specifications.

Power supply voltage

Inverter Phase advance capacitor

Induction motor

Page 11: Nais vf 8 z manual

10

ACInverter

5cmor more

10cm or more

5cmor more

10cm or more

ATTENTION Install the unit on a non-combustible material such as metal.

Installing it on other material could lead to fire. Do not place the unit near flammable materials. Doing so could lead to fire. Do not hold the cover during transportation. Doing so could cause the unit to

drop and lead to injuries. Do not allow foreign matter such as metal swarf enter the unit. Entry of this

type of matter could lead to damage and/or fire. Mount the unit according to the instruction manual in a place where the

weight can be withstood. Failure to do so could lead to dropping of the unitand to injuries.

Do not install or operate an inverter that is damaged or with parts missing.Doing so could lead to injury.

Install the inverter vertically.Installing it in any other way decreases itsradiative effect and results in malfunction.

Make sure the ambient temperaturestays within the specification.The ambient temperature surrounding theinverter will increase when it is installednear a heating unit or housed inside a panel.This may reduce the life of the inverter. Ifyou want to house the inverter inside a panel,give careful consideration to the coolingmethod and panel size. Ambient temperature variations

–10°C to +40°C

Note: Ambient temperatures shouldbe measured at a point 5 cmfrom the inverter.

Space around the inverter

Installation

Avoid installing the inverter in thefollowing locations.

Areas subject to direct sunlight. Areas subject to high relative humidity. Areas with large amounts of oil mist,dust or fiber dust.

Areas where corrosive gases arepresent.

Areas where explosive gas is present. Near flammable materials such aswood.

Areas subject to vibration such aspresses.

Vertical Horizontal Sideways

Page 12: Nais vf 8 z manual

11

400V 5.5, 7.5kW 400V 11, 15kW

Unit: mm Unit: mm

4-ø5 (Mounting hole) 4-ø7 (Mounting hole)

ø22

2-ø35

188

200

33 33 37

90

3-ø22

22

156 19

0

165 21

0

204220

284

300

138

150

Outline Dimensions

Page 13: Nais vf 8 z manual

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400V 19, 22kW 400V 30, 37kW

Unit: mm Unit: mm

210

162

5

255

130 3-ø43

270

450

410

4-ø7 (Mounting hole)

4-ø7 (Mounting hole)

230

174

5

3-ø43 10260

400

360

380365

60

Page 14: Nais vf 8 z manual

13

400V 5.5, 7.5kW

Front cover removed

* Do not remove the frame cover.

Type nameplate

Rating label

Front cover

Ratingnameplate

Operation panel

Mounting hole

Charge LED

Main circuitterminal(see page 18)

Conduit entry plate(Remove this plate for wiring)

Control circuitterminal(see page 20)

Ground terminal

Operation panel

Warning label

Frame cover

Parts Identification

Conduit plate mounting screw

Page 15: Nais vf 8 z manual

14

400V 11, 15kW

Mountinghole

Charge LED

Main circuitterminal(see page 18)

Control circuitterminal(see page 20)

Ground terminals

Warning label

Conduit entry plate

Operation panel

Typenameplate

Frontcover

Ratingnameplate

400V 19~37kW

Mountinghole

ChargeLED

Main circuitterminal(see page 18)

Control circuitterminal(see page 20)

Ground terminals

Warning label

Front cover removed

Operation panel

Frontcover

Ratingnameplate

Typenameplate

Front cover removed

Page 16: Nais vf 8 z manual

15

Fitting/removing the operation panel

<Removal> 1.Remove the cover of

INVERTER. 2.Hold both sides of the operation

panel. 3. Pull the panel toward you.

<Fitting> 1.Remove the cover of

INVERTER. 2.Align the connecting position of

INVERTER and operation panel. 3.Press operation panel in

INVERTER.

Caution

When fitting or removing, turn inverter power off and check that thecharge LED is off, or the inverter may be damaged.If the operation panel is removed when the inverter is operating inlocal mode, the inverter will automatically shut off.

Mode displayIn operation mode, the modedisplay shows local/externalcontrol operation signals andfrequency signals.In frequency setting or monitormode, it displays the symbol forthe selected mode.Frequency setting mode: F1Monitor mode : A0~A6Set value monitor,data setting : Parameter No.

Main displayShows the frequency,current, line speed(speed), fault messagesand data for functionsettings

LOCK switchUsed to prohibit anychange or reset in thepreset data.

(up), (down) andSHIFT push buttonsUsed to change the dataand output frequency.

STOP push buttonStops the motor.

Forward/reversepush buttonsUsed to operate theinverter.

SELECT push buttonUsed to select operation,frequency setting andmonitor modes.

SET push buttonUsed to store data in memory.

SETSELECT

SHIFT

FWD. REV.

LOCK

MODE

Hz

STOP

Operation panel

Page 17: Nais vf 8 z manual

16

Using the operation panel mounted remotely from the inverter unit The operation panel can be removed from the inverter and mounted in a

panel door, etc. (The optional extension cord and panel holder are required.)

<Connection> Connect one end of the extension lead to the inverter (at the point where

the operation panel was removed) and the other end to the now remoteoperation panel. See diagram.

Caution:Incorrect connector orientation may result in damage to theinverter.

Extension cable Panel holder (Product No.: BFV9060)Options

L Product No.1 m BFV90613 m BFV90635 m BFV9065

Operation panel

Panel holder

Cable band

Inverter

Mounting screw

Extension cable

L

Mountingholedimensions

Page 18: Nais vf 8 z manual

17

ATTENTION

Always confirm that the input power is OFF before starting wiring.Failure to do so could lead to electric shock or fire.

Always connect the earth lead.Failure to do so could lead to electric shock or fire.

Wiring work must be carried out by a qualified technician.Failure to do so could lead to electric shock or fire.

Always install the unit before wiring.Failure to do so could lead to electric shock or fire.

ATTENTION Do not connect an AC power supply to the output terminals (U/T1, V/T2,

W/T3). Doing so could lead to injury or fire. Confirm that the product's rated voltage and the AC power supply voltage

match.Failure to do so could lead to injury or fire.

Do not connect a braking resistor other than the braking resistor designatedby MEW (exclusive option) to the braking resistor terminals (DB+. DB–).Doing so could lead to fire.

Tighten the terminal screws to the designated tightening torque.Failure to do so could lead to overheating or fire.

PrecautionsNote the following points carefully to prevent miswiring and misuse of theinverter.1. Connect the power supply to input terminals (R/L1, S/L2, T/L3) and the

motor to output terminals (U/T1, V/T2, W/T3).2. Do not connect anything other than the optional brake resistor across

terminals DB+ and DB– (5.5, 7.5, 11kW). Never short these terminals toeach other as this will damage the internal electronics of the inverter.

3. Use sleeved crimp terminal lugs for power supply and motorconnections.

4. After terminating power cables double check for tightness as access willbe limited once control circuit wiring is in place.

5. When connecting the inverter directly to a large-capacity transformer(500 kVA or more), be sure to use the optional power factor correctingreactor in the input circuit of the inverter.

6. Select peripheral devices and wire size according to the table on page19.

Main Circuit Wiring

Page 19: Nais vf 8 z manual

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Wiring

400V Three phase series (5.5~11kW)

400V Three phase series (15~37kW)

Brake resistor (optional) When the brake resistor is to be used, parameter No. 18 must be set to "0"

for correct operation. (5.5, 7.5, 11kW)The brake circuit will not function when a value other than "0" is set.

Brake resistor (optional)

IM

AC inverterMain circuit terminal block

MotorGround

Powersupply

Ground marking

MCCB

Note:

IM

AC inverterMain circuit terminal block

MotorGround

Powersupply

Ground marking

Note:

MCCB

Page 20: Nais vf 8 z manual

19

400V Three phase series

Min wire sizeInvertercapacity

Circuit breaker(MCCB) Input Output Tightening torque

Crimpconnectors

5.5kW 20A 3.5mm2 2mm2 1.2N·m (12.2kgf·cm)7.5kW 30A 5.5mm2 3.5mm2 1.2N·m (12.2kgf·cm)11kW 50A 8mm2 5.5mm2 1.6N·m (16.3kgf·cm)15kW 60A 14mm2 8mm2 1.6N·m (16.3kgf·cm)19kW 100A 14mm2 14mm2 2.5N·m (25.5kgf·cm)22kW 100A 22mm2 14mm2 2.5N·m (25.5kgf·cm)30kW 125A 22mm2 22mm2 2.5N·m (25.5kgf·cm)37kW 150A 38mm2 38mm2 2.5N·m (25.5kgf·cm)

Note 3

Notes)1. MCCB's whose overcurrent trip is electro magnetic and thermal trip by

harmonic current must have o/load factor off less than 50%.2. Do not use standard motor type circuit breakers, replace with suitably

rated MCCB.3. Crimp connectors must be used ring terminals.

Page 21: Nais vf 8 z manual

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Forward/reverse

StopStart

Relay outputSpeed pot(10kΩ, 1/4 watt. min.)

0~5VOutput4~20mAInput

0~5V0~10VInput

COM NCCOM

NO

SW4 SW1 SW2 SW3

C E

Wiring

Terminal Nos. 1 to 4 are used to set the frequency with remote operation.(Set parameter No. 09 to external)Terminal Nos. 3 and 5 are the output frequency value voltage signal output terminals.(See parameter Nos. 59 and 60)

The relay outputs are the faultwarning output and multifunctionoutput. These are set to the faultwarning output as the default.(See parameter No. 24.)The contact state shown is thenormal state for when parameterNo. 24 is set to 5. (Relay output:no-voltage contact AC250V, 0.5Aresistance load)

Operation status output.(Set with parameter No. 23.)

Terminal Nos. 10 to 12 are tocontrol the operation/stop, etc.(Set parameter No. 08 to external touse).

Terminal Nos. 14 to 16 are multifunctioncontrol input terminals for multi-speedoperation, jog, reset, etc.Set the functions with parameter Nos. 19, 20.

• SW4When SW4 is ON, the inverter will run with the 2nd BASE FREQUENCY (parameterNo.43), 2nd DC BOOST LEVEL (parameter No.44) andACCELERATION/DECELERATION TIME 2 (parameter Nos. 37 and 38) set data.Note that there will be no change when the acceleration/deceleration time is fixed withSW1, 2 and 3.

Note : Terminal No. 3 and 6 (COM) are not connected to each other and should be keptseparate as one is analogue and one is digital.

Control Circuit Wiring

Operation status outputsopen-collector outputs with50V DC, 50mA max. ratings

[Control circuit wiring]• Wire size : 16 AWG or 18 AWG• Tightening torque : 0.8N·m (8kgf·cm)• Screw size : M3.5

Operation status output.(Set with parameter No. 23.)

Page 22: Nais vf 8 z manual

21

Cautions 1. Use shielded cables for all control signal

wiring and keep them more than 20 cmfrom power wiring.

2. Maximum allowable signal line length is30 meters.

3. Drive control inputs are high impedence,low voltage and as such the use of goodquality relay/push-buttons is recommend-ed as current drawn by these terminals islow.

4. No-voltage contact signal or open-collector outputs signal should be usedwith control terminals. 10 to 16. (If avoltage signal is applied across theseterminals, the internal electronics may bedamaged.)* Input circuit schematics are shown on

right. Take special care to avoid loopor leakage current.

5. When an inductive load is to be driven byan open-collector output, be sure to use afreewheel diode.

Freewheel diode

e.g. 24Vpowersupply

4.7kΩ

COM

24V

Page 23: Nais vf 8 z manual

22

ATTENTION Always fit the cover before turning the input power ON. Do not remove the

cover while the power is ON.Doing so could lead to electric shock.

Do not operate the switches with wet hands.Doing so could lead to electric shock.

Do not touch the inverter terminals when the inverter power is ON or evenwhen the inverter is stopped.Doing so could lead to electric shock.

The STOP button is not designed for emergency stop purposes. Prepare aseparate emergency stop button.Failure to do so could lead to injury.

ATTENTION The heat sink fins and brake resistor (exclusive option) can reach high

temperatures, do not touch them. Doing so could lead to burns. The inverter can be easily set to run from low speeds to high speeds.

Confirm the tolerable speed range of the motor and machine before startingoperation. Failure to do so could lead to injury.

Prepare holding brakes when required.Failure to do so could lead to injury.

Before turning on power, check the following points again.①Check that all wiring is correct. Reversed wiring between the power supply

and the load, in particular, can result in damage to the inverter.②Make sure the inverter rating and power supply voltages match each

other.③Make sure no power capacitor is connected to the motor, as it can

damage the inverter.④Before starting a trial run, check the set frequency.

Operating with the operation panel

The drive can be started and stopped and the frequency set using theoperation panel.The jog feature is also available from the operation panel.Operate using the following procedure.

Basic Operation

Page 24: Nais vf 8 z manual

23

Basic operation procedure

Main display on.

<Example: Set the frequency to 30Hz.>

Press the SELECT pushbutton and themain display will flash.

Press to enter 3.

Press the SHIFT button to move theflashing digit to the right.

Press to enter 0.

Press to set the data.

Press the or button.

The motor will start rotating.(Check that the motor is rotating in the directioncorresponding to the button pressed.)The frequency will automatically increase to 30 Hzin about 2.5 seconds.<Example: Changing the frequency to 60 Hz.>

Press the SELECT pushbutton and themain display will flash.

Press to enter 6.

Press to set the data.

Press the button.

The motor will stop.(The frequency will decrease from 60 Hz to 0 Hz in about 5 seconds.)

* Operation frequency can be adjusted with the up button and down button .

Use the up button to increase frequency.

Use the down button to decrease frequency.(Once the UP or DOWN button is pressed, the mode display will change to .)

Note) When the desired operation frequency is obtained on the display, press the SET button tostore it in the internal memory.Otherwise, the set frequency data will be lost.*The main display of the operation panel can be changed with the monitor selection

(parameter No. 60).The operation speed can be set with the frequency or line speed display.

*Refer to the section [Functional Descriptions (By parameter No.)] for details on jogoperation.

Stopcommand

Mode display Main display

(The factory setting is "0.5Hz".)

The display code temporarilygoes off, then returns to theoutput frequency again.

The display data temporarilygoes off, then returns to theoutput frequency again.

Operatingfrequency

setting

Frequencychangeduring

operation

SELECT

up

down

SET

SHIFT

SELECT

up

SHIFT

Operationcommand

Power ON

Page 25: Nais vf 8 z manual

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Monitoring with the operation panelThe monitor items include operation monitor, frequency setting, output andfault monitoring and setting data monitoring.The monitor item can be changed by pressing the SELECT push button.

button and button.

The operation and control state aredisplayed.

The main display on the operation panelcan be changed with monitor selection(parameter No. 60).Refer to operation signal (parameter No.08) and frequency setting signal(parameter No. 09) for details on the modedisplays.

The frequency can be set with the operationpanel.

The main display on the operation panelcan be changed with monitor selection(parameter No. 60).The monitor will change to the operationmonitor when the SET button is pressed.

The output current, output voltage, setfrequency and fault details are displayed.

The display details can be changed with the

Up button and Down button .

Refer to the section "Fault Trip Details andRemedies" for details on the faults. (Seepages 65 and 66.)

The function setting data is displayed.The display details can be changed withthe Up button , Down button andSHIFT button.The password (parameter No. 71) datacannot be monitored.

Monitoring

Main display Mode display

Output frequency

Operation monitor

Pres

s th

e SE

LEC

T pu

sh b

utto

n.

Main display Mode display

Function setting data

Setting data monitor

Main display Mode display

Set frequency

Frequency setting

Main display

Output frequency (A0)Output voltage (A1)Set frequency (A2)Fault details (A3~A6)

Output/fault monitor

Press the SELECT pushbutton

Press the SELECT pushbutton

Press the SELECT pushbutton

* The rotation direction can be confirmed with the lamps (red LEDs) on the

Mode display

Page 26: Nais vf 8 z manual

25

The various function data can be changed and set when the operation isstopped. Note that some functions can be changed during operation.(See page 26)

Setting functions when operation is stopped [Setting example: Change the maximum frequency from 60Hz to 50Hz]

Press the stop button to stop the inverter.

LOCK

Press the Lock button to turn off thelock indicator on the mode display.When a password is set, it must beentered at this point (see page 51.)

up Press twice to select parameter 03.

SELECT Press to select the main display.

down Press to enter the new data (50)

SET Press to set the data.

LOCK

Press to turn on the lock indicator onthe mode display. (The mode displaywill change to alphabetic characters.)

Operation preparationcompleted.

....... The normal stop state will be enteredand the inverter can be run.

Setting and Changing Functions

Mode display Main display

The display code will turnoff and on again once.(The mode display flashes.)

Lock indicator (on)

Lock indicator (off)

Page 27: Nais vf 8 z manual

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Setting precautions 1. No data can be changed if the lock indicator is on. 2. The inverter cannot be operated unless the lock indicator is on. 3. If the function setting returns to the "operation preparation completed" state

during data changing while a start signal is being applied through externalcontrol, an "OP" error will be displayed, causing the inverter to remaininoperative.(Reset the fault indication using the instructions under "Resetting FaultTrips" on pages 67 and 68.)(If this occurs, complete data changing first by disabling the start signal, thenapply the start signal again.)

4. The lock button resets the parameter No. to operation preparationcompleted state. Press the button using the tip of ball-point pen orsomething similar.

5. Set data will be stored in memory even after the power supply has beenturned off.

Setting functions during operation

ATTENTIONThe motor speed/torque characteristics could change significantly and themotor may suddenly start or stop when data is being changed duringoperation.(before making changes please be sure of the cause and effect that thesemay have on the drive/machine, ensure personal safety at all times.)Failure to do so could lead to injury.

[Parameters that can be changed during operation]Parameter No. 1/2 : 1st acceleration/deceleration timeParameter No. 5/44 : DC boost level/2nd DC Boost levelParameter No. 27 ~ 29 : Jog frequency, acceleration/deceleration timeParameter No. 30 ~ 36 : Preset frequency 2 ~ 8 (Note 3)Parameter No. 37 ~ 42 : Acceleration/deceleration time 2 ~ 4Parameter No. 57/58 : Bias/Gain frequency (Note 3)Parameter No. 59 : 0 – 5V output voltage compensationParameter No. 61 : Line speed multiplierParameter No. 64 : Carrier frequencyDrive output may go "0 volt" output and the rotation of the motor shaft maystop if "0000" is set in any of the pre-set speed settings 2 ~ 8, "0 Hz or lessis set for the bias frequency" or "0000 is set for the gain frequency".When making changes to the above data be aware of the possible causeand effect it may have on the motor and machine with personnel safety inmind.

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[Setting example: To change DC boost level from 5(%) to 15 (%)]

Operation state (for 60Hz operation)LOCK

Press the LOCK button to turn off the lock indicator on the mode display. When a password is set, it must be entered at this point (see page 51).

Press to display the parameter No. to be changed. Note)

The data value will not display forparameters that cannot be changedduring operation. (See FunctionalDescriptions list).

Press to flash the main display.

Press to display the data (15) to be changed.

Press to set the data. Control with the new data will start simultaneously with the pressing of this button.

LOCK

Press to turn on the lock indicator on the mode display. (The mode display will change to alphabetic characters.)

* The data digit can be moved with the SHIFT switch.

Setting precautions

1. No data can be changed if the lock indicator is on.2. If a stop signal is input while changing the data, the "operation preparation

completed" state will be returned to.3. If "preset frequency 2 ~ 8" or "bias/gain frequency" is set during operation or

during 0(V) stop, when the motor starts 0(V) stopping from operation or operationfrom 0(V) stopping causing the inverter stop state to change, the display willchange from the "normal operation state" to the "0(V) stop state".

up

SELECT

up

SET

The display code will turnoff and on again once.(The mode display flashes.)

Mode display Main display

Lock indicator (off)

Lock indicator (on)

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28

Para-meterNo.

Parameter name Setting valueor code

Factorysetting data

01 1st ACCELERATION TIME (sec) 0 • 0.1~1600 **005.0

02 1st DECELERATION TIME (sec) 0 • 0.1~1600 **005.0

03 FREQUENCY RANGE (V/F PATTERN) 50 • 60 • FF 6004 V/F CURVE 0 • 1 005 DC BOOST LEVEL (%) 0~40 02

06 OVERLOAD FUNCTION 0 • 1 • 2 • 3 207 OVERLOAD CURRENT (A) 0.1~300.0 *

08 LOCAL/EXTERNAL CONTROL 0~6 009 LOCAL/EXTERNAL FREQUENCY 0•1•2•3•4 010 REVERSE LOCKOUT 0 • 1 011 STOP MODE SELECT 0 • 1 012 STOP FREQUENCY (Hz) 0.2~60 00.5013 DC BRAKE TIME (sec) 0 • 0.1~30.0 00014 DC BRAKE LEVEL 0~100 0015 MAX. FREQUENCY (Hz) 50~400 60.0016 BASE FREQUENCY (Hz) 45~400 60.0017 ACCELERATION FREQUENCY HOLD 0 • 1 118 DECELERATION FREQUENCY HOLD 0 • 1 119 PRESET FUNCTION SELECT 0 • 1 • 2 020 MULTIFUNCTION INPUT SELECT 0~10 021 For manufacturers use only. — —22 AUXILIARY INTERLOCK 0 • 1 023 OPERATION STATUS OUTPUT SELECT 0•1•2•3•4 024 OUTPUT RELAY FUNCTION SELECT 0~6 525 DETECT FREQUENCY(OPERATION STATUS) (Hz) 0 • 0.2~400 00.5026 DETECT FREQUENCY(OUTPUT RELAY) (Hz) 0 • 0.2~400 00.5027 JOG FREQUENCY (Hz) 0.2~20 10.00

28 JOG ACCELERATION TIME (sec) 0 • 0.1~1600 **005.0

29 JOG DECELERATION TIME (sec) 0 • 0.1~1600 **005.0

30 PRESET FREQUENCY 2 (Hz) 0 • 0.2~400 20.00

31 PRESET FREQUENCY 3 (Hz) 0 • 0.2~400 30.00

32 PRESET FREQUENCY 4 (Hz) 0 • 0.2~400 40.00

Functional Descriptions (Parameter Table)

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Para-meterNo.

Parameter name Setting valueor code

Factorysetting data

33 PRESET FREQUENCY 5 (Hz) 0 • 0.2~400 15.00

34 PRESET FREQUENCY 6 (Hz) 0 • 0.2~400 25.00

35 PRESET FREQUENCY 7 (Hz) 0 • 0.2~400 35.00

36 PRESET FREQUENCY 8 (Hz) 0 • 0.2~400 45.00

37 ACCELERATION TIME 2 (sec) 0.1~1600 **005.0

38 DECELERATION TIME 2 (sec) 0.1~1600 **005.0

39 ACCELERATION TIME 3 (sec) 0.1~1600 **005.0

40 DECELERATION TIME 3 (sec) 0.1~1600 **005.0

41 ACCELERATION TIME 4 (sec) 0.1~1600 **005.0

42 DECELERATION TIME 4 (sec) 0.1~1600 **005.0

43 2nd BASE FREQUENCY (Hz) 45~400 60.0044 2nd DC BOOST LEVEL (%) 0~40 05

45 SKIP FREQUENCY 1 (Hz) 0 • 0.2~400 000046 SKIP FREQUENCY 2 (Hz) 0 • 0.2~400 000047 SKIP FREQUENCY 3 (Hz) 0 • 0.2~400 000048 SKIP FREQUENCY BAND WIDTH (Hz) 0 • 1~10 049 CURRENT LIMIT FUNCTION 0 • 0.1~9.9 0050 POWER LOSS START MODE 0 • 1 • 2 • 3 1

51 RIDE-THROUGH RESTART 0 • 1 • 2 0 52 WAIT TIME (sec) 0.1~100 000.1 53 ACCELERATION/DECELERATION PATTERN 0 • 1 054 LOWER FREQUENCY CLAMP (Hz) 0.2~400 00.5055 UPPER FREQUENCY CLAMP (Hz) 0.2~400 400.056 BIAS/GAIN FUNCTION SELECT 0 · 1 0

57 BIAS/FREQUENCY (Hz) –99.9~400 000.0

58 GAIN FREQUENCY (Hz) 0 • 0.2~400 60.00

59 0–5V OUTPUT VOLTAGE COMPENSATION (%) 75~125 100

60 MONITOR SELECT 0 • 1 • 2 • 3 0 61 LINE SPEED MULTIPLIER 000.1~100 030.0

62 MAX. OUTPUT VOLTAGE (V) 0 • 1~500 000 63 OCS LEVEL (%) 1~200 140

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Para-meterNo.

Parameter name Setting valueor code

Factorysetting data

64 CARRIER FREQUENCY (kHz)

0.8/1.1/1.6• 2.5/5.0/7.5/10.0/12.5/15.0

0.8

65 For manufacturers use only. — — 66 For manufacturers use only. — — 67 For manufacturers use only. — — 68 For manufacturers use only. — — 69 For manufacturers use only. — — 70 For manufacturers use only. — — 71 PASSWORD 0 • 1~999 000 72 SETTING DATA CLEAR 0 • 1 • 2 0

73 BAUD RATE (bit/s)300/600/

1200/2400/4800/9600

9600

74 STOP BIT LENGTH 1/2 1 75 PARITY CHECK 0/1/2 0 76 NO. OF COMMUNICATION RETRIES 0~10 0 77 CR/LF SELECT VALIDITY 0/1/2/3 0

* The same current value as the inverter's rated current. ** 5.5 ~ 15kW : 005.0, 19 ~ 37kW : 015.0.

The run frequency (speed 1) is factory set to 0.5Hz.

Note) Parameters marked with a can be changed while the inverter is running.

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1st ACCELERATION TIME (Parameter No.01)Used to set the time to accelerate to the maximum outputfrequency from 0.2Hz.

Data setting range (sec) 0.04 · 0.1 to 1600Setting unit (sec) 0.1 (0.1~1000) 1 (1000~1600)

The display code for 0.04 sec. is “0000”. The maximum output frequency is set with parameter No.

03 and 15.

1st DECELERATION TIME (sec) (Parameter No.02)Used to set the time to decelerate from the maximum outputfrequency to 0.2Hz.

Data setting range (sec) 0.04 · 0.1~1600Setting unit (sec) 0.1 (0.1~1000) 1 (1000~1600)

The display code for 0.04 sec. is "0000". The maximum output frequency is set with parameter No.

03 and 15.

FREQUENCY RANGE (V/F PATTERN) (Parameter No.03)A frequency range of 50/60Hz or 50 to 400Hz can be set independently from themaximum output frequency (50 to 400Hz).

Data settingvalue Name Remarks

50 50Hz mode60 60Hz mode

The frequency range is set regardless of the parameter No.15and 16 settings.

FF Free mode

The frequency range is set according to the parameter No.15and 16 settings.The maximum output frequency is set in parameter No. 15and the base frequency is set in parameter No.16.

[50Hz mode] [60Hz mode] [Free mode]

Functional Descriptions (By Parameter No.)

Output frequency (Hz)

Out

put v

olta

ge (%

)

Out

put v

olta

ge (%

)

Out

put v

olta

ge (%

)

Max. output frequency =60HzBase frequency = 60Hz

Max. output frequency =50HzBase frequency = 50Hz

Output frequency (Hz) Output frequency (Hz)

Base frequency(Mode No. 16)

Max. output frequency(Mode No. 15)

Accelerationtime

Max. outputfrequency

Out

put

frequ

ency

(Hz)

0

Decelerationtime

Out

put

frequ

ency

(Hz)

Max. outputfrequency

0

Page 33: Nais vf 8 z manual

32

Notes) 1. Both the maximum output frequency and base frequency are set to 60Hz asthe factory setting data.

2. Take note of the UPPER FREQUENCY CLAMP (parameter No.55) whenchanging the maximum output frequency setting.

V/F CURVE (Parameter No.04)

Used to select either the constant orsquare torque mode.

Data sett-ing value Name Remarks

0 Constanttorque mode

For machineapplications

1 Squaretorque mode

For fan and pumpapplications

DC BOOST LEVEL (Parameter No.05)Used to select a DC boost that best fits the load characteristics.

Data settingrange

0 to 40(A larger value causes a higher output voltage and stronger boost.)

[Constant torque mode] [Reduced torque mode]

[Constant torque mode]

[Square torque mode]

Out

put v

olta

ge (%

)Basefrequency

Outputfrequency(Hz)

Out

put v

olta

ge (%

)

Out

put v

olta

ge (%

)

Outputfrequency(Hz)

Basefrequency

Basefrequency

Boostlevel

Boostlevel

Outputfrequency(Hz)

Out

put v

olta

ge (%

)

Basefrequency

Outputfrequency(Hz)

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OVERLOAD FUNCTION and OVERLOAD CURRENT(Parameter Nos.06 and 07)

Used to set the operation level of the electronic thermal relay when the motor overload isdetected and the inverter output is to be stopped.

[Parameter No.06: Setting of electronic thermal relay function details]

Datasettingvalue

Validityof

functionDetails of function

0 Invalid

Note that the OL trip willoccur if a current that is150% of the rated invertercurrent flows for one minute

1 Valid Without inverter outputfrequency derating

2 Valid With inverter outputfrequency derating

3 Valid Forced ventilation motorspecifications

[Parameter No.06 = 1]

[Parameter No.06 = 2]

[Parameter No.06 = 3]

Note) When the electronic thermal relay is tripped, "OL" will display and the motor willcoast-to-stop.

[Parameter No.07:Setting of thermal relay current]

Data setting range (A) 0.1 ~ 300.0

*What is derating?When a motor is driven at lowspeeds, the cooling effect drops.This derating functionautomatically compensates byadjusting the operating levelspecified by the thermal setting.

* Set current and thermal relay function Set current×100%

⇒ Does not trip Set current×125% ⇒ Trips

Der

atin

g (%

)

Outputfrequency (Hz)

Der

atin

g (%

)

Outputfrequency (Hz)

Outputfrequency (Hz)

Der

atin

g (%

)

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LOCAL/EXTERNAL CONTROL (Parameter No.08)Used to select whether to operate the inverter with the operation panel push-buttons (local) orwith input signals (external).Data

settingvalue

Modedisplay

Local/External

Panelreset

function

Signal format andbutton operation

Control terminal connectiondiagrams

0

Local Provided ———— ——————————

1 Not provided

4

External

Provided

2-wire signalStart/stop andForward/reverse

3-wire signalStart, Forward/reverse and Stop

2 Not provided

5

External

Provided

2-wire signalForward start/stopReverse start/stop

3 Not provided

6

External

Provided

3-wire signalForward startReverse startStop

*Panel reset functionWhen a fault trip occurs, the state cannot be reset with the external stop signal. Instead usethis function to reset with the stop SW signal on the operation panel. Note that if the reset lockout function is used, that function will have the priority. Resetting with the terminals is also valid.

LOCAL/EXTERNAL FREQUENCY (Parameter No.09)Used to select whether the frequency signal is to be set from the operation panel (local) or withan input signal (external).

Datasettingvalue

Modedisplay

Local/External

Frequency setting signaldetails

Applicable control circuit terminalNo.

0 Local Set frequency fromoperation panel ——————————

1 Potentiometer signal Terminal Nos.1, 2 and 3 (Connectwiper of potentiometer to 2)

2 0–5(V) voltage signal Terminals Nos.2 and 3 (2:+,3:–)3 0–10(V) voltage signal Terminals Nos.2 and 3 (2:+,3:–)4

External

4–20(mA) current signal Terminals Nos.4 and 3 (4:+,3:–)

Note) If an analog signal is input from an external source when the data setting is 1 to 4, theinverter output will start and stop at a boundary of approx. 1/100 of the input signal's fullscale. (Zero volt stop function)

START STOP

FWD./REV.

FWD./REV

Forwardstart

Reversestart Stop

Forwardstart/stop

Reversestart/stop

STARTSTOP

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REVERSE LOCKOUT (Parameter No.10)Used to prevent reverse operation when the motor is to be used only in the forward operation.

Data settingvalue Details

0 Reverse operation enabled (both forward/reverse operation enabled)1 Reverse operation prohibited (only forward operation enabled)

Note) When the reverse operation prohibit setting is made, reverse operation will beimpossible in both the local and external modes.

STOP MODE SELECT (Parameter No.11)Used to select whether to ramp-to-stop or coast-to-stop when stopping the inverter.

Data settingvalue Details Explanation of operation

0 Ramp-to-stop The frequency is decelerated by the stop signal accordingto the deceleration time, and then the motor stops.

1 Coast-to-stopThe inverter output is shut off immediately by the stopsignal.(The motor naturally stops due to inertia)

STOP FREQUENCY (Parameter No.12)Used to select the frequency at which DC injection braking starts when stopping with ramp-to-stop.

Data setting range (Hz) 0.2 to 60 (set in 0.01Hz increments)

DC INJECTION BRAKE TIME and DC INJECTION BRAKE LEVEL(Parameter Nos.13 and 14)

The DC injection can be applied when the inverter output frequency drops below the stopfrequency during ramp-to-stop or when switching between forward and reverse operation.When used with jogging operation, positioning control can be carried out.

[Parameter No.13: The DC injection brake time is set.]Data setting range (sec) 0.1 to 30.0 (The brakes are not applied when 000 is set.)

[Parameter No.14: The DC injection brake level is set]

Data setting range 0 to 100 (Set in increments of five. The braking force willincrease when a larger value is set.)

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36

*The frequency for applyingthe DC injection braking isset by parameter No.12STOP FREQUENCY.

*The DC braking time whenswitching between forwardand reverse operations isfixed to 0.1 sec.

MAX FREQUENCY and BASE FREQUENCY(Parameter Nos.15 and 16)

Used to set the maximum output frequency and base frequency.(These parameters are valid only when "FF" is set in parameter No.3)

[Parameter No.15:The maximum output frequency is set.]

Data setting range (Hz) 50.00 ~ 400.0

[Parameter No.16:The base frequency is set.]

Data setting range (Hz) 45.00 ~ 400.0

Notes) 1. A frequency higher than the upper frequency clamp (parameter No.55) cannot beoutput.

2. Read the precautions given on page 56 when setting a value other than 50Hz or60Hz.

ACCELERATION FREQUENCY HOLD (Parameter No.17)When the set acceleration time is too short for the inertial load, this parameter can be used totemporarily reduce the acceleration rate to prevent an overcurrent trip.

Data setting value Function details0 Stall prevention function disabled1 Stall prevention function enabled

Note)The level that the stallprevention functions atcan be set with parameterNo.63 OCS LEVEL.

[Ramp-to-stop] [Forward/reverse]

DC brake timefixed to 0.1 sec.

(Stop frequency)ParameterNo.12

(Forward)

Operationfrequency

(Reverse)

DC brake timeParameter No.13

Output frequency (Hz)

Max. output frequency(Parameter No.15)

Out

put v

olta

ge (%

) Base frequency(Parameter No.16)

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DECELERATION FREQUENCY HOLD (Parameter No.18)When the set deceleration time is too short for the inertial load, this parameter can be used totemporarily reduce the deceleration rate to prevent an overvoltage trip.

Data setting value Function details0 Stall prevention function disabled1 Stall prevention function enabled

Note) Set this parameter to "0" when using the brake resistor (optional).The brake circuit will not function if set to 1.

PRESET FUNCTION SELECT (Parameter No.19)Used to set the control functions of SW1, SW2 and SW3 (control circuit terminal Nos.14, 15and 16) when set as the multi-step speed with parameter No.20.

Data setting value Function details0 Set to multi-step speed frequency operation function1 Set to 2nd, 3rd and 4th acceleration/deceleration operation function

2 Set to acceleration/deceleration linked multi-step speed frequencyoperation function

[When parameter No.20 is set to "0" multi-step speed frequency operation]

Control circuitterminal Parameter No.19 data setting value

14 15 16SW1 SW2 SW3 0 1 2OFF OFF OFF Speed 1 1st accel./decel. Speed 1, 1st accel./decel.ON OFF OFF Speed 2 2nd accel./decel. Speed 2, 2nd accel./decel.OFF ON OFF Speed 3 3rd accel./decel. Speed 3, 3rd accel./decel.ON ON OFF Speed 4 4th accel./decel. Speed 4, 4th accel./decel.OFF OFF ON Speed 5 1st accel./decel. Speed 5, 1st accel./decel.ON OFF ON Speed 6 1st accel./decel. Speed 6, 1st accel./decel.OFF ON ON Speed 7 1st accel./decel. Speed 7, 1st accel./decel.ON ON ON Speed 8 1st accel./decel. Speed 8, 1st accel./decel.

Notes) 1. Speed 1 will be the command value of the frequency setting signal, set withparameter No.09.

2. The speed 2 to 8 frequencies are set with parameter Nos.30 to 36, and the 2nd to4th acceleration/deceleration times are set with parameter Nos.37 to 42.

3. See pages 59 and 60 for the application examples.

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MULTIFUNCTION INPUT SELECT (Parameter No.20)Used to set the control functions of SW1, SW2 and SW3 (control terminal Nos.14, 15 and 16).

Control circuit terminalSW1 (No.14) SW2 (No.15) SW3 (No.16)

0 Multi-step speed SW31 Reset input2 Multi-step speed SW2 Reset lockout3 Jogging function4

Multi-step speed SW1Auxiliary stop input

5 Reset input6 Reset lockout7 Jogging function8

Auxiliary stop input(See parameter No.22) Reset input

9 Reset lockout10

Frequency setting signal switching

Jogging function

[Reset input]The fault trip state can be reset when the SW signal is changed from "closed" to "open".

[Reset lockout]Resetting of the fault trip state by the stop signal can be prohibited. In that case, afterthe details of the trip are confirmed and measures are taken, resetting can be done withthis SW signal.• Always input the SW signal at "closed".• Even if the stop signal is input during a fault trip, the trip state will be held.• Confirm the details of the trip and take measures, and then reset the state by

"opening" this SW signal.[Jogging function]

The signal input terminal is set for executing jog function from external connection.[Auxiliary stop input]

The signal input terminal is set for fault stop or coast-to-stop from source other than theinverter.

[Frequency setting signal switching]The signal input terminal is set to select between the potentiometer signal andvoltage/current signal, to be switched when the frequency setting signal is input from anexternal source. (Parameter No.09 must be set to 1 to 4.)

Data settingvalue

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AUXILIARY INTERLOCK (parameter No.22)

Used to select the auxiliary interlock fault orauxiliary interlock stop mode. This is valid whenthe terminal function for auxiliary stop input isselected in parameter No.20.(Control circuit terminal Nos.15 or 16)

Datasettingvalue

Function Faultdisplay

Faultalarm

Fault tripmemory

0Auxiliaryinterlockfault

AU Provided

1Auxiliaryinterlockstop

AS Notprovided

Stored inmemory

OUTPUT TERMINAL FUNCTION SELECT (Parameter No.23)

Used to set the functions of the operation status output (open collector output). The run signal,arrival signal, overload prealarm, frequency detection signal or reverse operation signal can beselected.

Data settingvalue Function Conditions for open collector output to turn ON

0 Run signal ON when run signal is on or during inverter output

1 Arrival signal On when the output frequency is within the setfrequency ±2Hz

2 Overload prealarm On when the output current is 140% of the rated currentor higher or when the electronic thermal level is reached

3 Frequencydetection signal

On when the output frequency exceeds the detectedfrequency (set in parameter No.25)

4 Reverse run signal On when the inverter is running in reverse

Time

Operationrelay

Auxil

iary

sto

p in

put (

b co

ntac

t)

Coast-to-stop

(Closed)(Open)

Outputfrequency

(Operation frequency)

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OUTPUT RY FUNCTION SELECT (Parameter No.24)Used to set the function of the operation status relay. The run signal, arrival signal, overloadprealarm, frequency detection signal, reverse operation signal, fault warning signal (operation1) or fault warning signal (operation 2) can be selected.

Data settingvalue Function Conditions for operation status relay to turn ON

(terminal No.7-8: ON, terminal No.9-8: OFF)0 Run signal ON when run signal is on or during inverter output

1 Arrival signal On when the output frequency is within the setfrequency ±2Hz

2 Overload prealarm On when the output current is 140% of the rated currentor higher or when the electronic thermal level is reached

3 Frequencydetection signal

On when the output frequency exceeds the detectedfrequency (set in parameter No.25)

4 Reverse run signal On when the inverter is running in reverse

5 Fault warning signal(Operation 1)

Relay operation is OFF during normal state and ONduring fault state.

6 Fault warning signal(Operation 2)

Relay operation is ON during normal state and OFFduring fault state.

DETECT FREQUENCY [OUTPUT TERMINAL, OUTPUT RY](Parameter Nos.25 and 26)

Used to set the detection frequency for when the operation status output (open collectoroutput) and operation status relay output function, when setting is the frequency detectionsignal.

[Parameter No.25:Set the operation status output (open collector output) detection frequency]

[Parameter No.26: Set the operation status relay output detection frequency]

Data setting range (Hz) 0000 · 0.2 ~ 400 Setting unit’s (Hz) 0.01 (0.2 ~ 100Hz) 0.1 (100 ~ 400Hz)

(ON) (ON)

(ON)

(ON)

Detection frequencyParameter No.25 Parameter No.26

Arrival signal (OFF)

Run signal (OFF)

Set frequency (±2Hz)

Output frequency

Frequency detection signal (OFF)

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JOG FREQUENCY, JOG ACCELERATION TIME, JOG DECELERATIONTIME (Parameter Nos.27, 28 and 29)A range of 0.2Hz to 20Hz can be set in 0.01Hz increments.This function is handy for positioning.

[Parameter No.27: Jog frequency setting] Data setting range (Hz) 0.2 ~ 20 (0.01Hz increments)

[Parameter No.28: Jog acceleration time setting][Parameter No.29: Jog deceleration time setting] Data setting range (sec.) 0.04 · 0.1 ~ 1600 (The indication for 0.04 sec. is “0000”)

[Local jog operation] Parameter No.08 must be set to 0. Press the SHIFT button until “LJ.” Is indicated on the Mode Display. The motor will jog while the forward start or reverse start button is held down.

[External jog operation] Parameter No.08 must be set to 1 to 6. The jog function must be selected in parameter No.20. Close the control circuit terminals Nos. 6 to 16, and "EJ." will display on the Mode

Display. Use control terminals 10, 11 and 12 to start or stop jogging and to run in the forward or

reverse directions.

PRESET FREQUENCIES 2 to 8 (Parameter Nos.30 to 36)Used to program the speed 2 to 8 frequencies for multi-step speed operation.

[Parameter No.30: Speed 2 frequency setting][Parameter No.31: Speed 3 frequency setting][Parameter No.32: Speed 4 frequency setting][Parameter No.33: Speed 5 frequency setting][Parameter No.34: Speed 6 frequency setting][Parameter No.35: Speed 7 frequency setting][Parameter No.36: Speed 8 frequency setting]

Data setting range (Hz) 0000 · 0.2 ~ 400 (“0000” sets 0V stop) Setting unit (Hz) 0.01 (0.2 ~ 100Hz) 0.1 (100 ~ 400Hz)

Note) Frequencies that exceed the maximum output frequency and the upper frequencyclamp will not be output.

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ACCELERATION TIME 2 to 4 (Parameter Nos.37, 39 and 41)DECELERATION TIME 2 to 4 (Parameter Nos.38, 40 and 42)Used to set the acceleration times 2 to 4 and deceleration times 2 to 4 for 4-speedacceleration/deceleration control operation.

[Parameter No.37: Acceleration time 2 setting][Parameter No.38: Deceleration time 2 setting][Parameter No.39: Acceleration time 3 setting][Parameter No.40: Deceleration time 3 setting][Parameter No.41: Acceleration time 4 setting][Parameter No.42: Deceleration time 4 setting]

Data setting range (sec) 0.1 ~ 1600

2nd BASE FREQUENCY (HZ) (Parameter No.43)Used to set the base frequency of the 2ndcharacteristics selected with SW4 function.

Data setting range (Hz) 45.0 ~ 400.0

Note) The maximum output frequency will be thevalue set in parameter No.03 (frequencyrange) or parameter No. 15 (max. outputfrequency).

2nd DC BOOST LEVEL (Parameter No.44)Used to select a DC boost for the 2nd characteristics selected with SW4 function.

Datasettingrange

Details

0 ~ 40

A larger valuecauses a higherouput voltageand strongerboost.

[Constant torque mode] [Reduced torque mode] (Parameter No.04:0) (Parameter No.04:1)

Max. output frequency(parameter No.15)

2nd base frequency

Out

put v

olta

ge (%

)

Out

put v

olta

ge (%

)

Boostlevel

Outputfrequency(Hz)

Basefrequency

Out

put v

olta

ge (%

)

Boostlevel

Outputfrequency(Hz)

Basefrequency

Output frequency (Hz)

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SKIP FREQUENCIES 1 to 3 (Parameter Nos.45 to 47) andSKIP FREQUENCY BAND WIDTH (Parameter No.48)If the load mechanism resonates at a specific inverter output frequency, a continuousoperation in that frequency band can be avoided by setting the skip frequency and the skipfrequency band.

*Up to three skip frequencies can be set, and the skip frequency band can be set between 1 and 10Hz.

[Parameter No.45: Skip frequency 1 setting][Parameter No.46: Skip frequency 2 setting][Parameter No.47: Skip frequency 3 setting]

Data setting range (Hz)

0000 · 0.2 ~ 400(“0000” is set when the skip frequency is to be disabled)

[Parameter No.48: Skip frequency band setting Data setting range (Hz)

0 · 1 ~ 10(“0” is set when the skip frequency is to be disabled)

CURRENT LIMIT FUNCTION (Parameter No.49)Frequency Fold Back Rate

If the output current reaches the overcurrent stall level due to an overload operation, thefrequency is automatically reduced. When the load returns to the correct level, the frequency isautomatically returned to the original setting, and the operation is continued.This function is effective for preventing overcurrent trips in machines that knead glutinousmaterials, etc.

*The deceleration time to automatically reduce the frequency when the overcurrent stalllevel is reached is set with this parameter.

*The operation level (overcurrent stall level) can be set with parameter No.63 (OCS level).

Data setting range (sec.) 00 · 0.1 ~ 9.9 (“00” s set when the current limit function is disabled.)

Skip frequency(parameter Nos.45, 46, 47)Set frequency

(Note)The skip frequencyrange is passed duringacceleration anddeceleration.

Out

put f

requ

ency

(Hz)

Skip frequency band(parameter No.48)

Does not decelerate to below 10Hz.

Normal acceleration/deceleration time

Deceleration time according toparameter No.49 setting value

Outputfrequency

Outputcurrent

OCS level (parameter No.63)

Page 45: Nais vf 8 z manual

44

Power supply

Run signal

Data 0 Output frequencyData 1 Output frequencyData 2 Output frequencyData 3 Output frequency

Powersupply

Run signal

OutputfrequencyOutputfrequencyOutputfrequencyOutputfrequency

POWER LOSS START MODE (Parameter No.50)

ATTENTION: Depending on the start mode function setting, if the run signal is on and the power is turned

ON or the power is restored after a power failure, the unit may start (restart) suddenly.(Design the machine so that personal safety can be ensured even if the unit startssuddenly.) Failure to do so could lead to injury.

Depending on the start mode function setting, if the fault trip is reset with the run signalpresent, the unit may restart suddenly. (Reset the trip after ensuring personal safety.)Failure to do so could lead to injury.

* The factory setting is 1: OP stop.When set to 0: Operation starts immediately when the power is turned on.When set to 2: Operation starts after the wait time is passed after the power is turned on.

Used to select the start mode when the power supply is turned ON and the run signal is input.Data sett-ing value

Outlineoperation Details of operation

0 Run Operation starts immediately when the power is turned ON and the lowvoltage level (LU level) is exceeded.

1 "OP" stop

The inverter OP trips when the power is turned ON and the low voltage level(UL level) is exceeded.Turn the run signal OFF once, reset the inverter and then turn the run signalOn again to resume operation.

2Operateafter waittime

The inverter starts when the power is turned ON, the low voltage level (LUlevel) is exceeded and the wait time is passed.(The wait time is set with parameter No.52.)

3 "OP" stop

The inverter OP trips when the power is turned ON and the low voltage level(UL level) is exceeded. Turn the run signal OFF once, reset the inverter andthen turn the run signal On again to resume operation. When this data is set, the same operation as data setting value "1" willoccur when the run signal is input after the power is turned ON, however,the wait time will be waited for during normal starting.

[When power is turned ON with run signal ON]

[When run signal is turned ON after power is turned ON]

LU level

“OP” tripWait time(Parameter No.52)

LU level

Wait time(Parameter No.52)

Wait time(Parameter No.52)“OP” trip

Page 46: Nais vf 8 z manual

45

RIDE-THROUGH RESTART (Parameter No.51)

ATTENTION:

Depending on the RIDE-THROUGH RESTART function settings, the motor may restartsuddenly after the power is restored.(Ensure personal safety before restarting.)Failure to do so could lead to injury.

Used to select the restart mode after an instantaneous power failure occurs, according to theload conditions and system. A wait timer function is built-in.

Inverter operation in regard to instantaneous power failure timeDatasettingvalue

Min. 15msec orless (Note 1)

Min. 15msec isexceeded (Note 1)

Min. 100msec orless (Note 2)

Min. 100msec isexceeded (Note 2)

0• LU trip occurs, and the operation takes place according to the details set in

the start mode.• "LU" is saved in the fault memory.

1 Operation continues

• Restarts from 0Hz after the wait time has elapsed.• "LU" is saved in the fault memory.

2• Motor speed is detected after the wait time has

elapsed, and the inverter restarts at a frequencycorresponding to the speed.

• "LU" is saved in the fault memory.

• Operation takesplace according tothe details set in thestart mode.

• "LU" is saved in thefault memory.

Notes) 1. This is the min. time for operation at the rated output current. (This time may be longerdepending on the model.)

2. This is the min. time. (This time may be longer if the rated capacity is larger.)Even if the power failure time is relatively long (approx. 1 min.), the inverter may restart afterthe power is restored. Thus, wait at least four min. (wait time + 2 min.) after the power isrestored before handling the inverter, motor or load facility.

3. The wait time can be set between 0.1 to 100 sec. with parameter No.52.

[When voltage drop time is more than 15msec but less than 100msec.]

LU trip

Voltage drop time

Current limitfunction

Speedsearch time

Wait time(Parameter No.52)

Operates according to thestart mode setting details

LU level

LU trip

LU trip

Power supply

Output frequency

Output frequency

Output frequency

Normal acceleration

• Data setting value "0"(No restart)

• Data setting value "1" (0Hz restart)

• Data setting value "2" (Pick up restart)

Page 47: Nais vf 8 z manual

46

WAIT TIME (Parameter No.52)Used to specify the wait time for the start mode and the ride-through restart function.

Data setting range (sec) 0.1 ~ 100

ACCELERATION/DECELERATION PATTERN (Parameter No.53)Used to select an acceleration/deceleration pattern suited to the application.

Datasettingvalue

Details

0 Linear acceleration/deceleration

1 S-character accel-eration/deceleration

Note)If the acceleration/decel-eration time setting is 0.04sec., linear acceleration/deceleration will be usedeven if S-characteracceleration/deceleration isset.

LOWER and UPPER FREQUENCY CLAMP(Parameter Nos.54 and 55)

Used to set the lower and upper limits of the output frequency.

[Parameter No.54: LOWER FREQUENCY CLAMP setting][Parameter No.55: UPPER FREQUENCY CLAMP setting]

Data setting range (Hz) 0.2~400 (0.2~100Hz: 0.01 units/100~400Hz: 0.1 units)

Notes) 1. If the upper frequency clamp is lowerthan the maximum output frequency(parameter No. 15), the upperfrequency clamp will have thepriority.

2. If the lower frequency clamp ishigher than the upper frequencyclamp (reverse operation setting),the upper frequency clamp will havethe priority.

[Data 0: Linear acceleration/deceleration setting]

Currentfrequency

Set frequencyO

utpu

tfre

quen

cy

Time

Currentfrequency

Set frequency

Out

put

frequ

ency

Time

Set frequency signal

MAX. FREQUENCY(Parameter No.15)

Out

put

frequ

ency

(Hz)

LOWER FREQUENCY CLAMP(Parameter No.54)

UPPERFREQUENCYCLAMP(Parameter No.55)

[Data 1: S-character acceeleration/deceleration setting]

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47

BIAS/GAIN FUNCTION SELECT, BIAS FREQUENCY,GAIN FREQUENCY (Parameter Nos.56, 57 and 58)The relation with the output frequency and frequency setting signal (potentiometer, 0 to 5V, 0 to10V, 4 to 20mA), can be changed randomly. Use this function according to the application.

[Parameter No.56: BIAS/GAIN FUNCTION SELECT]Data setting range Function details

0 Bias/gain function disabled1 Bias/gain function enabled

[Parameter No.57: BIAS FREQUENCY setting] Data setting range (Hz) –99.9 to 400 (0.1 units)

[Parameter No.58: GAIN FREQUENCY setting]

Data setting range (Hz) 0000 and 0.2 to 400 (0.1 units) (When "0000" is set, 0V stop will function.)

Notes) 1. A frequency exceeding the maximum output frequency or upper frequency clampcannot be output. The frequency will not drop below the lower frequency clamp.

2. Even if a minus frequency setting signal is input, the inverter will not run in reverse.

[When bias frequency setting is positive] [When bias frequency setting is negative]

Out

put

frequ

ency

(Hz)

MAX. FREQUENCY(Parameter No.15)

BIAS

FR

EQU

ENC

Y(P

aram

eter

No.

57)

Frequency settingsignal

Out

put f

requ

ency

(Hz) MAX. FREQUENCY

(Parameter No.15)

GAINFREQUENCY(Parameter No.58)

Frequency settingsignal

BIAS

FR

EQU

ENC

Y(P

aram

eter

No.

57)

GAINFREQUENCY(Parameter No.58)

Page 49: Nais vf 8 z manual

48

0 – 5V OUTPUT VOLTAGE COMPENSATION (Parameter No.59)The voltage signal that is proportional to the "output frequency" output from control circuitterminal No. 5 is output linearly from the stop 0(V) to the 5V MAX. FREQUENCY setting value(parameter No.15) when it is the default value.The 5V value for the above MAX. FREQUENCYsetting value (parameter No.15) can beadjusted with this mode.

3.75V(75% setting)

5.00V(100% setting)

6.25V(125% setting)

Data setting range(%)(Adjustment range)

75 to 125(can be set in 1% units) Output frequency (Hz)

MAX. FREQUENCYsetting value(Parameter No.15)

125% setting

100% setting

75% setting

Adjustment range

Volta

ge s

igna

l out

put (

V)

Page 50: Nais vf 8 z manual

49

MONITOR SELECT and LINE SPEED MULTIPLIER(Parameter Nos.60 and 61)

Used to select the details of the operation panel's main display.

[Parameter No.60: Monitor details selection]

Data setting value Operation panel main display value0 Frequency1 Frequency2 Line speed (speed)3 Line speed (speed)

[Parameter No.61: LINE SPEED MULTIPLIER setting]Used to set the multiplier in regard to the frequency when the line speed is displayed on themain display of the operation panel.

Data setting range 0.1 ~ 100 (can be set in 0.1 units)

[Example 1] When displaying the line speed:

Line speed (m/min) = f (Hz) × → sets the multiplierSet 0.5 when the line speed is 30m/min at f = 60Hz.

[Example 2] When displaying the speed:

Speed (rpm) = f (Hz) × → Sets the multiplier (Set 30 for a 4-pole motor)

Note) A line speed exceeding "10000" cannot be displayed.

120P

(No. of poles)

K

Page 51: Nais vf 8 z manual

50

MAX OUTPUT VOLTAGE (Parameter No.62)Used to set the max. output voltage.

Data setting range (V) 0 · 1 ~ 500 (can be set in 1 units) When “0” is set, the power voltage value will be output.

Notes)1. A voltage exceeding the power

voltage cannot be output.2. This setting does not affect the DC

braking level.

OCS LEVEL (Parameter No.63)The OCS level (overcurrent stall prevention operation level) and current clamp function levelcan be set with a percent (%) to the inverter's rated current.

Data setting range (%) 1 ~ 200 (can be set in 1 units)

Notes) 1. The OCS level and current clamp levels are the same.2. This setting is not related to the electronic thermal relay level and overload detection

level.

CARRIER FREQUENCY (Parameter No.64)The PWM control carrier frequency is set to 0.8kHz before shipment from the factory. However,this carrier frequency can be changed to "reduce motor noise during motor drive" and to "avoidmechanical resonance".

Data setting range (kHz) 0.8 · 1.1 · 1.6 · 2.5 · 5.0 · 7.5 · 10.0 · 12.5 · 15.0 (Nine types of settings are possible.)

Notes) 1. This setting can be changed during operation, but the following groups [lowfrequency group] and [high frequency group] can be set only when the operation isstopped. (1) Low frequency group: 0.8, 1.1, 1.6 (kHz) (2) High frequency group: 2.5, 5.0, 7.5, 10.0, 12.5, 15.0 (kHz)

2. Decrease the output current when 12.5kHz or 15kHz is selected.(Refer to Note on page 76.)

Out

put v

olta

ge

Max. output voltage(Parameter No.62)

Base frequency

Power voltage

Output frequency

Page 52: Nais vf 8 z manual

51

PASSWORD (Parameter No.71)

Used to prevent accidental data setting after correct data has been set.

Notes)1. When "000" is set, the password will be disabled.2. The password cannot be monitored with the mode monitor operation.

(Always write down the password so that you do not forget it.)

[The data setting procedure when the password has been set.]

Press the Lock button.

Password set.

Use Up, Down, or Shift button to display the password.

Press the Set button.

Display the parameter number you want, set or change data.

Mode Maindisplay display

[Example] When password is 777

Parameter No.1To move to 1st accelerationtime setting

No password set.

Page 53: Nais vf 8 z manual

52

SETTING DATA CLEAR (Initialization) (Parameter No.72)Used to change the set data to the factory settings.

Setting data Details0 Data value that indicates normal state.1 Changes all data to the factory settings.2 Changes all data to the factory settings.

Note) Set the display value to "1" or "2", and press the SET button. The data will be changed,the display value will automatically be set to "0", and the initialization will be completed.

COMMUNICATION PARAMETERS (Parameter Nos.73 to 77)Used to set the communication parameters required for controlling the inverter with acommunication unit (option).

ParameterNo. Setting time Data setting value and details

73 BAUD RATE (bit/s) 300/600/1200/2400/4800/960074 STOP BIT LENGTH 1: 1 bit / 2: 2 bit75 PARITY CHECK 0: No parity 1: Odd parity 2: Even parity

76 NO. OF COMMUNICATIONRETRIES 0 to 10 times (can be set in 1 units)

77 CR/LF SELECT VALIDITY 0: None 1: CR provided 2: LF provided3: CR + LF

Page 54: Nais vf 8 z manual

53

The inverter has various functions as shown in the Parameter Table (seepage 28, 29 and 30).Make the settings according to the procedures given on pages 54 andfollowing to match your application.

Contents

Changing from Local Control to External Control .................... 54 Switching between Manual and Automatic Frequency Setting

Signal ........................................................................................ 55 Setting Maximum Output Frequency ....................................... 56 Setting Maximum Output Voltage ............................................ 57 Boosting Torque at Low Speeds .............................................. 58 To Set the Multi-step Speed Operation Frequency ................. 59 Setting Accel. and Decel. Times According to Application ...... 60 Jog Operation for Positioning ................................................... 61 Countermeasures Against Inverter Malfunctioning (Tripping) . 62 Application of Fans and Pumps ............................................... 63 Operation at Proportional Frequencies

(Master and Slave Operation) ................................................... 64 Fault Trip Details and Remedies .............................................. 65 Resetting Fault Trips ................................................................ 67

To Effectively Use the Inverter

Page 55: Nais vf 8 z manual

54

To enable external control by an external switch or sequencer, follow the procedure below.(1) Enabling external control for start/stop and forward/reverse operation (Parameter No. 08)Press theLock buttonto turn off thelockindicator.

Press the Upbutton toselectParameter08.

Press the Selectbutton (maindisplay startsflashing).

Press the Upbutton to set thedisplay code from 0to 1.

⇒Pressthe Setbutton.

Press the Lockbuton to turnon the lockindicator.

Terminal Connection <Controlling start/stop with single switch>

(2) Enabling external control for frequency setting signals (0–10V), Parameter No. 09Press theLock buttonto turn off thelockindicator.

Press the Upbutton toselectParameter09.

Press the Selectbutton (maindisplay startsflashing).

Press the Upbutton to set thedisplay code from 0to 3.

⇒Pressthe Setbutton.

Press the Lockbutton to turnon the lockindicator.

Terminal Connection

Note) If the frequency setting signal is 0, the output frequency will be 0%, and the output will be stopped. (0V stop)

Speed pot.(10kΩ and 1/4W minimum)

Changing from Local Control toExternal Control

Mode display Mode display Main display Main display

Display will→ turn off and

on again. Left side of modedisplay will changeto E (external).

Mode display Mode display Main display Main display

Display will→ turn off and

on again. Right side of modedisplay will changeto E (external).

*Parameter No.08 allowsterminalfunction to selectbetween forwardstart/stopand reverse start/stopmodes.(Refer to page 34).

<Display code>0:Local1:Speed pot.2:External (0–5V)3:External (0–10V)4:External (4–20mA)

Stop

Forward/Reverse open: Forward close: ReverseStart

Start/Stop open: Stop close: Start

Forward/Reverse open: Forward close: Reverse

0 10V → Voltage signal0 5V → Voltage signal4 20mA → Current signalMin. Max. → Speed pot.

COMCOM

COM

4~20mA

0~10V(0~5V)

Out

put f

requ

ency

Page 56: Nais vf 8 z manual

55

When inputting the frequency setting signal from an external source, it canbe switched easily between a "potentiometer signal (manual)" and "voltage/current signal (automatic)" by using a switch.

This is effective for feeding back the frequency setting signal as a voltage/current signal from a sensor (temperature, pressure) and switching to themanual frequency setting potentiometer signal and automatic controlsignal required for the "adjustment, inspection and forced control" requiredwhen automatically controlling the inverter such as for fan and pumpapplications.

[Functions and control circuit terminals used] 1. Function: Frequency setting signal switching function

• Set parameter No.20 to 8, 9 or 10. 2. Control circuit terminal: Terminals 6-14 (SW1 OFF → Potentiometer)

[Switching of potentiometer signal and voltage signal]

[Switching of potentiometer signal and current signal]

Note)The frequency setting signal mustbe set to external.• Set parameter No.09 to 2 (0 to 5V) or 3 (0 to 10V)

Note)The frequency setting signal mustbe set to external.• Set parameter No.09 to 4

Switching between Manual and Automatic Frequency Setting Signal

Potentiometer10kΩ1/4Wor morePotentiometer

10kΩ1/4Wor more

Page 57: Nais vf 8 z manual

56

The maximum output frequency is preset to 60Hz as a factory setting.When changing the maximum output frequency, set the V/F pattern (parameter No.03) to FF,and then change the maximum output frequency setting (parameter No.15).

Function setting procedure (Example to change maximum output frequency from 60Hz to 120Hz.)Press theLock buttonto turn off theLockindicator.

Press the Upbutton toselectParameter03.

Press the Selectbutton (maindisplay startsflashing).

Use Up, Down andShift buttons to setdisplay code to"FF" (free).

⇒Pressthe Setbutton.

Use Up, Downand Shiftbuttons to selectParameter 15.

Press the Selectbutton (maindisplay startsflashing).

Use Up, Down andShift buttons to setdisplay value to"120.0".

⇒Pressthe Setbutton.

Press the Lockbutton to turnon the lockindicator.

Before changing dataV/F pattern (parameter No.03) = 60

After changing dataV/F pattern (parameter No.03) = FF

If the V/F pattern is set to 50 or 60, the modewill be fixed regardless of the maximumoutput frequency and base frequency.

If the V/F pattern is set to FF, the V/F patternwill be determined according to the maximumoutput frequency and base frequency.

Notes) 1. A frequency exceeding the upper frequency clamp (parameter No.55) cannot be

output. 2. If a general purpose motor with a rated frequency of 50 or 60Hz is run at a higher

frequency, the motor may be damaged. Always set the frequency to match the motorcharacteristics.

3. If the base frequency must be changed together with the maximum output frequencyfor a high-speed exclusive motor, etc., change parameter No.16 with the proceduregiven above.

4. If the general purpose motor is to be run with a frequency higher than the commercialfrequency, set the base frequency to the normal motor rated frequency (50 or 60Hz).

5. The motor will enter the rated output characteristics, and the generated torque will dropin inverse proportion to the frequency when above the base frequency (normally 50 or60Hz).

Setting Maximum Output FrequencyO

utpu

t vol

tage

(%) BASE FREQUENCY

(Parameter No.16)

MAX FREQUENCY(Parameter No.15)

Output frequency (Hz)Output frequency (Hz)

Out

put v

olta

ge (%

)

6060

Display will→ turn off and

on again.

Mode display Mode display Main display Main display

Mode display Main display Main display Mode display

Page 58: Nais vf 8 z manual

57

Maximum output voltage at the base frequency can be programmed with Parameter 62.When the power supply voltage fluctuation is too large or the power supply voltage exceedsthe motor's rated voltage, set maximum output voltage below the power supply voltage tostabilize the output voltage.(This function is disabled (000) by factory setting, so maximum output voltage equals supplyvoltage).

Example: Set maximum output voltage to 200V.Press theLock buttonto turn off thelockindicator.

Press the Up,Down and Shiftbuttons to selectparameter 62.

Press the Selectbutton (maindisplay startsflashing)

⇒Use Up button toset display valueto "200."

⇒Pressthe Setbutton

Press the Lockbutton to turnon the lockindicator.

Before changing data After changing data

Setting Maximum Output Voltage

SHIFT

Out

put v

olta

ge (V

)

Powersupplyvoltage

Power supply voltage

Base frequencyOutput frequency (Hz)

Out

put v

olta

ge (V

)

Base frequencyOutput frequency (Hz)

Mode display Mode display Main display Main display Mode display

Display will→ turn off and

on again.

Page 59: Nais vf 8 z manual

58

SHIFT

DC BOOST LEVEL (voltage/frequency characteristics) (Parameter No.05)Input voltage percent display : 0 to 40%

The appropriate torque boost for the load can be selected. The larger the data display value,the higher the torque boost. Note that if the torque boost is too strong, OC (overcurrent) trips,motor overheating or an increase in noise may occur.

Press theLock buttonto turn off thelockindicator.

Press the Upbutton toselectParameter05.

Press the Selectbutton (maindisplay startsflashing).

Use the Up,Down and Shiftbuttons to setdisplay value to"10" (ex.).

⇒Pressthe Setbutton.

Press the Lockbutton to turnon the lockindicator.

Boosting Torque at Low Speeds

Output frequency (Hz) Base frequency

Out

put v

olta

ge (%

)

DC

Boo

st le

vel

Display will→ turn off and

on again.Mode display Mode display Main display Main display Mode display

Page 60: Nais vf 8 z manual

59

Outputfrequency

Run signal

Speed 1 60Hz

Speed 2 30Hz

Speed 1 60Hz

Speed 7 30Hz

Speed 8 40Hz

Speed 6 20Hz

Speed 5 10Hz

Speed 4 50Hz

Speed 3 40Hz

Time

SHIFT

Factory setting for this unit is Multi-step speed operation mode.(Parameter Nos. 19 and 20 are both set to "0".) Preset frequency settings Example: Preset frequency 1→ Setting frequency on the operation panel or control circuit terminals

Preset frequency 2 → 30Hz Preset frequency 6 → 20HzPreset frequency 3 → 40Hz Preset frequency 7 → 30HzPreset frequency 4 → 50Hz Preset frequency 8 → 40HzPreset frequency 5 → 10Hz ..... (Parameter Nos. 30, 31, 32, 33, 34, 35 and 36)

Press the Lockbutton to turnoff the lockindicator.

Press the Up,Down and Shiftbuttons toselectParameter 30.

Press the Selectbutton (maindisplay startsflashing).

Use Up, Down andShift buttons to setdisplay value to"30.00"

⇒ Press the Setbutton

Press the Upbutton to selectParameter 31.

Press the Selectbutton (maindisplay startsflashing).

⇒Press the Upbutton to set thevalue to 40.00.

⇒Pressthe Setbutton

Similarly, set Parameter 32 to 50Hz, Parameter 33to 10Hz, Parameter 34 to 20Hz, Parameter 35 to30Hz and Parameter 36 to 40Hz.

⇒Press the Lockbutton to turn onthe lock indicator.

Terminal connection

Mode display will change to E. for preset frequencies 2 to 8.

To Set the Multi-step Speed OperationFrequency

Display will→ turn off and

on again.

Display will→ turn off and

on again. Mode display Main display Main display

Mode display

Example: Setting preset frequency 1 to 60Hz

Mode display Mode display Main display Main display

Out

put

frequ

enc y

SW 1

SW 3

SW

Runsignal

Speed 1 60Hz

Speed 8 40Hz

Speed 7 30Hz

Speed 6 20Hz

Speed 4 50Hz

Speed 3 40HzSpeed 2

30Hz

Speed 1 60Hz

Tim e

Spe

ed 5

10H

z

Example: Setting preset frequency 1 to 60Hz

Page 61: Nais vf 8 z manual

60

(1) Setting Accel. and Decel. Times 2, 3 and 4 (Set to "1" in Parameter 19)(2) Accel. and Decel. Time Settings (Parameter Nos. 37, 38, 39, 40, 41 and 42)

Example: Acceleration Time 2 (Parameter No.37) → 10 sec.Acceleration Time 3 (Parameter No.39) → 20 sec.Acceleration Time 4 (Parameter No.41) → 30 sec.Deceleration Time 2 (Parameter No.38) → 10 sec.Deceleration Time 3 (Parameter No.40) → 20 sec.Deceleration Time 4 (Parameter No.42) → 30 sec.

[In the following example, the acceleration/deceleration times at starting and ramp-to-stop are controlled in four steps.]

Terminal connection

Preset Frequencies 2, 3 and 4 can be linked with Accel. and Decel. Times 2, 3 and 4.(1) Parameter setting to Link Preset Frequencies and Accel. and Decel. Times (Set to "2" in Parameter 19)[In the following example, speed 1 is set to 60Hz, speeds 2 to 4 are set to the factory settings, and the acceleration/deceleration times are set to the above values.]

Terminal connection

Setting Accel. and Decel. TimesAccording to Application

Time

Decel.Time 1

Accel.Time 1

Out

put f

requ

ency

Runsignal

Accel.Time 4

Accel.Time 3

Accel.Time 2

Decel.Time 2

Decel.Time 3

Decel.Time 4

Speed 2 20Hz

Speed 1 60Hz

Speed 4 40Hz

Speed 3 30Hz

Speed 2 20Hz

Decel.Time 2

Decel.Time 2

Decel.Time 2

Decel.Time 3

Accel.Time 1

Accel.Time 3

Accel.Time 4

Time

Speed 3 30Hz

Out

put f

requ

ency

Startsignal

Page 62: Nais vf 8 z manual

61

Jog operationenable switch

ReverseStart switch

* **

SHIFT

Jog operation can be used for fine positioning of conveyor, press and similar machines. Jog Frequency .......................... Parameter No. 27 Jog Acceleration Time .............. Parameter No. 28 Jog Deceleration Time ............. Parameter No. 29 Example: Setting Jog Frequency to 15Hz, Jog Acceleration Time to 3 sec. and Jog Deceleration Time to 10 sec.

Press the Lockbutton to turnoff the lockindicator

Press the Up,Down and Shiftbuttons toselectParameter 27.

Press the Selectbutton (maindisplay startsflashing).

Press the Up,Down and Shiftbutton to setdisplay value to"15".

⇒ Press the Setbutton.

Press the Upbutton to selectParameter 28.

Press the Selectbutton. (maindisplay startsflashing).

Press the Up, Downand Shift button to setthe display value to"003.0".

⇒ Press theSet button.

Press the Upbutton to selectParameter 29.

Press the Selectbutton (maindisplay startsflashing).

Press the Up, Downand Shift button to setthe display value to"010.0".

⇒Pressthe Setbutton

Press the Lockbutton to turn onthe lockindicator.

Locally controlled Jog operation using the operation panelPress the Shift button on the operation panel while the inverter is stopped, the mode displayshows . (*Parameter No.08 must be set to "0".)

(Pressing the Shift button again will return the inverter to normal operation.)

Pressing the or button will enable Jog operation.

Jog operation via an auxiliary switchIf terminal 6 is shorted to terminal 16 when the inverter is not operating, the mode display shows

to indicate that jog operation is enabled.(To restore normal operation, disconnect terminal 6 from terminal 16.)External start/stop switches are used for jog operation.

* In the example at left, Parameter 8 (local/external control) is set to "2" or "5".

**Parameter 20 (Multifunction Input Select) must be set to "3", "7" or "10".

Jog Operation for Positioning

*Forward Start switch

Display will→ turn off and

on again.

Display will→ turn off and

on again. Mode display Main display Main display

Display willturn off andon again.

Mode display Mode display Main display Main display

Mode display Main display Main display Main display

Page 63: Nais vf 8 z manual

62

The inverter has the following functions to avoid malfunctioning (tripping) due to differences inloads or conditions.

(1) ACCELERATION FREQUENCY HOLD and DECELERATION FREQUENCY HOLD(Parameter Nos. 17 and 18)

• When the Accel. and Decel. Times settings do not match the load inertia, these functionstemporarily minimize the change in frequencies and wait for a load to follow them to preventtripping.The operation current level of this function can be set and changed with parameter No.63.

Press theLock button toturn off thelock indicator.

Press the Up,Down and Shiftbuttons toselectParameter 17.

Press the Selectbutton (maindisplay startsflashing).

Press the Upbutton to set thedisplay code to"1".

⇒Pressthe Setbutton.

Press the Lockbutton to turnon the lockindicator.

* Parameter No.18 can be set in the same manner.*The factory setting is “1” (stall enabled)

Set the function to 0 (stall prevention disabled) for loads that cause trouble when the motor speed accel. and decel. times are inconsistent.

(2) CURRENT LIMIT FUNCTION (Parameter No.49) (Frequency Fold Back Rate)[function enable/disable, deceleration time setting]• If the output current increases, the output frequency is

automatically lowered to prevent overcurrent (OC)tripping for applications that involve kneading andmixing of glutinous material (ex., bread kneader).(When the output current decreases, the frequency willautomatically return to its preset value.)The operation current level of this function can be setand changed with parameter No. 63.

[The following example shows when the CURRENT LIMIT FUNCTION is enabled and theresponse time is set to 1.5 sec.]

Press theLock button toturn off thelock indicator.

Press the Up,Down and Shiftbuttons toselectParameter 49.

Press the Selectbutton (maindisplay startsflashing).

Press the Upbutton to set thedisplay value to"1.5".

⇒Pressthe Setbutton.

Press the Lockbutton to turnon the lockindicator.

* Factory setting is "0" (means CURRENT LIMIT FUNCTION is off).

Countermeasures Against InverterMalfunctioning (Tripping)

Mode display Mode display Main display Main display Mode display

Mode display Mode display Main display Main display Mode display

Time

Mot

orcu

rrent

Out

put

frequ

ency

Time

Decrease frequency to preventan overcurrent fault.

Display will→ turn off and

on again.

Display will→ turn off and

on again.

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63

The inverter is equipped with V/F Curve (Square Low Speed Torque), Wait timer and Ride-Thru Restart functions for use with fans and pumps.

(1) V/F CURVE setting (Parameter 04)Press theLock buttonto turn off thelockindicator.

Press the Upbutton toselectParameter04.

Press the Selectbutton (maindisplay startsflashing).

⇒Press the Upbutton to set thedisplay code to "1".

⇒Pressthe Setbutton.

Press the Lockbutton to turnon the lockindicator.

*Factory setting is "0" (constant torque).

(2) POWER LOSS START MODE and WAIT TIME settings (Parameter Nos. 50 and 52)To enable automatic restart after power failure when the inverter is being used with a fan orpump, or when a timer for preventing stop during coasting rotation is not installed on thecontrol panel side, set the data code to 2. *Factory settings are "1" for Parameter 50 and "0.1 sec." for Parameter 52.

Datacode

Condition onpower supply

0 Run1 OP stop

2 Start after waittime has passed.

3 OP stop

Set the WAIT TIME function (Parameter No. 52).(Select the time from 0.1 to 100 seconds depending on requirements.)*Set longer than the motor coasting rotation (coast-to-stop) time.

(3) RIDE-THROUGH RESTART (Parameter No. 51)To enable restart after power failure when the inverter is being used for a fan or pump, setthe parameter to "1" or "2".* Factory setting is "0" for Parameter 51 and "0.1 sec." for Parameter 52.* If the RIDE-THROUGH RESTART function is set, the fault relay will not activate

when an undervoltage "LU" trip occurs.Datacode RIDE-THROUGH RESTART status

0 Ride-Thru Restart disabled("LU" trip)

1 Restart from 0Hz after set wait time

2 Restart at the frequency before powerfailure occurred after set wait time

Set the WAIT TIME function(Parameter No.52).(Select the time from 0.1 to 100 secondsdepending on requirements.)

Application of Fans and Pumps

Display will→ turn off and

on again.

Out

put v

olta

ge (%

)

Output frequency (Hz) Base frequency

Mode display Mode display Main display Main display Mode display

Page 65: Nais vf 8 z manual

64

The 0-5V output function, and the Bias and Gain functions can be set for proportional operation of up to five inverters.

Example: Set up two inverters to operate at proportional frequencies.Inverter 2 is to be operated at 50% of the output frequency of inverter 1, withthe maximum output frequency of both inverters set to 60Hz.

(1) Inverters 1 and 2 are connected as shown below.

(2) Set the Gain Frequency of inverter 2.(No bias frequency setting is required for proportional-frequency operation).

① Setting the Bias and Gain Functions (Setting Parameter No. 56 to "1").Press the Lockbutton to turnoff the lockindicator.

Press the Up,Down and Shiftbuttons toselectParameter 56.

Press the Selectbutton (Maindisplay startsflashing).

⇒Press the Upbutton to set thedisplay code to "1".

⇒Pressthe Setbutton.

② Set the GAIN FREQUENCY (Parameter No. 58).

Press the Upbutton to selectParameter 58.

Press the Selectbutton (maindisplay startsflashing).

Press the Downbutton to set thedisplay value to30.00.

⇒Pressthe Setbutton.

⇒Press the Lock button toturn on the lockindicator.

Inverter 1 (Master) Inverter 2 (Slave)Operated at 60Hz Operated at 50% of the output frequency of Inverter 1.

Operation at Proportional Frequencies(Master and Slave Operation)

Mode display Mode display Main display Main display

Display will→ turn off and

on again. Mode display Main display Main display Mode display

(0-5 V input) (0-5 V output)

Inverter 2 (Slave)Inverter 1 (Master)

Frequency setting signal

Operation at propor-tional frequencies

Maximum output frequency Maximum output frequency

Frequency setting signal

Gain frequency(Parameter No.58)O

utpu

t fre

quen

cy

Display will→ turn off and

on again.

Out

put f

requ

ency

Page 66: Nais vf 8 z manual

65

Fault trip memory ..... Output/Fault monitor A3 (latest), A4 (second to latest),A5 (third to latest), A6 (fourth to latest)

The details from the latest to the fourth of latest trip causes will be saved even when the poweris turned off. The details can be confirmed with the "output/fault monitor A3 to A6" described inMonitoring on page 24. (The delivery inspection details are saved in the memory when the unitis shipped.)

Display Fault details and cause Remedy• Instantaneous overcurrent

during acceleration orabnormal heating of heatsink

• Check for output short circuits andground faults

• Check ambient temperature and fanoperation

• Increase the acceleration time• Instantaneous overcurrent

during constant speed orabnormal heating of heatsink

• Check for output short circuits andground faults

• Check ambient temperature and fanoperation

• Eliminate excessive changes in load• Instantaneous overcurrent

during deceleration orabnormal heating of heatsink

• Check for output short circuits andground faults

• Check ambient temperature and fanoperation

• Increase the deceleration time• Overcurrent during

accleration• Check for open output phases• Increase the acceleration time• Adjust the boost level

• Overcurrent during constantspeed

• Check for open output phases• Eliminate excessive changes in load

• Overcurrent duringdeceleration

• Check for open output phases• Increase the deceleration time

• Excessive internal DCvoltage during acceleration(overvoltage)

• Increase the acceleration time• Connect a brake resistor

• Excessive internal DCvoltage during constantspeed (overvoltage)

• Eliminate excessive changes in load• Connect a brake resistor

• Excessive internal DCvoltage during deceleration(overvoltage)

• Increase the deceleration time• Connect a brake resistor

• Supply voltage drops to 85%or less of rating(undervoltage)

• Measure the supply voltage• Consider the ride-through restart

functionContinued on following page.

Fault Trip Details and Remedies

Page 67: Nais vf 8 z manual

66

Display Fault details and cause Remedy• An output current that is

125% or more of theelectronic thermal settingcurrent or 150% or more ofthe inverter's rated currentcontinued for one minuteor more. (Overload)

• Check the electronic thermal settingcurrent

• Reduce the load

• An auxiliary fault stopsignal was input fromcontrol circuit terminalNo.16 (auxiliary fault)

• Inspect the sequence circuit to confirmthat the auxiliary signal is correct.

• An auxiliary stop signalwas input from controlcircuit terminal No.16(auxiliary stop)

• Inspect the sequence circuit to confirmthat the auxiliary signal is correct.

• The operation panel wasdisconnected/connectedduring operation

• A run signal was inputwhile setting data in thestopped state, or the modewas returned to theoperation mode with theLOCK button

• The power was turned ONwhile the run signal wasON

• Take care with the handling of theoperation panel

• Check the run signal when the data isbeing set

• Check the POWER LOSS STARTMODE (parameter No.50)

• The inverter was subjectedto abnormal levels ofinterference.

• Reduce the noise around the inverter

• Communication faultbetween inverter andcommunication U/T

• Check connection between inverterand communication U/T

• Communication faultbetween communicationU/T and computer

• Check the connection of thecommunication wire

Note) Refer to "Troubleshooting ① and ② " on pages 69 to 71.

Page 68: Nais vf 8 z manual

67

If a fault is shown on the main display and the inverter stops, take the necessary action to discover the cause of the fault and then reset the inverter.

To reset the inverter, follow one of the procedures below.

Resetting by power supply

Turn off the power once, then turn it on again.(Operation is possible when the power is turned ON again.)

Resetting by stop input signal

For local setting (When parameter No.08 is set to 0)

Press the STOP button on the operation panel and the fault will be reset.(Operation is possible when the operation command button is set to START.)

For external setting (When parameter No.08 is set to 1, 2 or 3)

Turn the external operation command switch off once and the fault will be reset.(Operation is possible when the operation command button is set to START.)

Resetting by panel

For external setting (When parameter No.08 is set to 4, 5 or 6)

Press the STOP button on the operation panel and the fault will be reset.(Operation is possible when the operation command button is set to START.)

ATTENTION

Depending on the POWER LOSS START MODE function setting, the unit may restart suddenlyif the fault trip is reset while the operation signal is input.(Ensure personal safety before resetting.) Failure to do so could lead to injury.

* Read "POWER LOSS START MODE (parameter No.50)" on page 44.

Note) If the reset lockout function is used, the reset lockout function will have the priority.

Resetting Fault Trips

Page 69: Nais vf 8 z manual

68

Resetting by control terminals

Set parameter No.20 (MULTIFUNCTION INPUTSELECT) to 1, 5 or 8, and the fault can be reset withcontrol terminals 6 ~ 16.

If SW3 is closed and then opened, the fault will bereset.

ATTENTION

Depending on the POWER LOSS START MODE function setting, the unit may restart suddenlyif the fault trip is reset while the operation signal is input.(Ensure personal safety before resetting.) Failure to do so could lead to injury. * Read "POWER LOSS START MODE (parameter No.50)" on page 44.

[Reset lockout function] The resetting with control terminals 6-16 can be locked

out when 2, 6 or 9 is set in parameter No.20.

<When control terminals 6-16 are closed>Resetting is possible only with the power supply.

<When control terminals 6-16 are opened>Resetting with the power supply and by stop resetare possible.

*See "MULTIFUNCTION INPUT SELECT (parameter No.20)" on page 38.

Page 70: Nais vf 8 z manual

69

The motor does not rotate (when fault display is not lit)

Troubleshooting ①①①①

Check the operationpanel display.

Is the power voltage correct?

Check the frequencysetting value.

Set the frequency settingvalue to 0.2Hz or higher.

YES

The voltage is beingsupplied to the motor.

The motor is defective.

The output frequency is not displayed. The output voltage is not being supplied.

The inverter is defective.(Contact your supplier)

YES

Check the local/externaloperation setting.

Turn the local or externalSTART button ON.

Is the lock display (•) on? Press the lock button.

YES

YES

NO

Page 71: Nais vf 8 z manual

70

ATTENTION

Wait at least five minutes after turning the input power OFF before starting inspections.(Also confirm that the CHARGE lamp has gone out.)Failure to do so could lead to electric shocks.

Maintenance, inspection and part replacement must be done by qualified persons.(Remove all metal personal belongings (watches, bracelets, etc.) before starting the work.)(Use tools treated with insulation.)Failure to do so could lead to electric shocks or injuries.

The motor does not rotate (when fault display is lit)

When one of the faults on pages 65 and 66 is displayed but the motor has not rotate, check thefollowing:

(1) Is this the first time (or immediately after installation) power has been applied to theinverter? Check whether it has been in use.

(2) Check if this is an inverter malfunction (failure), or a wiring or motor malfunction.

If the phenomenon occurs for the first time or immediately after installation (pages 65 and 66 display such as OC1)

OC1, etc., on pages 65 and 66.

YES Inverter malfunction (Contactyour supplier for assistance).

After this procedure, make checks and remedies according to each fault displayed(refer to pages 65 and 66.)

Remove inverter load wiringfrom terminals U, V and W.

Press the START button.

Page 72: Nais vf 8 z manual

71

MCCB trips.

Is MCCB of suitable rating? YES

Is input/output terminal wiring correct? YES

Does a ground fault exist in main circuit wiring? YES

MCCB failure or inverter malfunction (Contact your supplier for assistance).

Motor has over temperature

Troubleshooting ②②②②

Does an open phase exist inthe output of the inverter?

Are V/F characteristic correct?

Is the load factor reductioncorrect for continuousoperation at low frequency?

Is the motor overloaded?

Inverter malfunction (Contact your supplier for assistance).

NO

NO

YES Reduce the load factor. Increase the motor capacity.(If the motor capacity exceedsthe inverter capacity, increasethe latter as well).

Reduce V/F characteristic.

Reduce the load factor or applyforced cooling.

Increase the motor capacity.(If the motor capacity exceedsthe inverter capacity, increasethe latter as well.)

Check if output frequency canbe increased for use.

YES

YES

YES

NO

Page 73: Nais vf 8 z manual

72

ATTENTION

Wait at least five minutes after turning the input power OFF before starting inspection.(Also confirm that the CHARGE lamp has gone out.)Failure to do so could lead to electric shocks.

Maintenance, inspection and part replacement must be done by qualified persons.(Remove all metal personal belongings (watches, bracelets, etc.) before starting the work.)(Use tools treated with insulation.)Failure to do so could lead to electric shocks or injuries.

Never modify the unit. Doing so could lead to electric shocks or injuries.(It would also invalidate the warranty).

ATTENTION

Have an electrician periodically tighten the terminal screws.Loosening of the terminal screws could lead to overheating or fire.

Precautions for inspectionsWhen measuring the insulation between the power supply line and motor line, alwaysdisconnect the wires connected to the inverter first. Do not perform a megger test on thecontrol circuit.

The inverter is mainly configured of semiconductor elements. Thus, daily inspections must becarried out to prevent the effect of the working environment such as the temperature, humidity,dust and vibration, and to prevent other trouble that occurs due to the passage of part usage andpart life.The standard replacement years that apply when the inverter is used a general environment(ambient average annual temperature 30°C, load rate of 80% or less, and 12 working hours orless a day) are given on the next page.

Maintenance and Inspection (Precautions)

Page 74: Nais vf 8 z manual

73

Inspection items(1) Daily inspection

Check that the inverter is operating as intended.Check the input and output voltages of the inverter during operation using a voltmeter.

(2) Periodic inspectionCheck all locations where inspection can only be performed when the inverter is stopped.

Parts replacementThe lifetime is greatly dependent on the installation conditions.

For example: a) The lifetime of a relay depends on the wear condition of its contact surfaces. The contact

current and load inductance are major factors. b) The capacitor inside the inverter is used mainly as a smoothing filter and its lifetime varies

greatly with temperature as internal chemical reactions take place.An aluminum electrolytic capacitor has Arrhenius law characteristics (10°C doubling law);the lifetime is 50% when the temperature rises 10°C, or the lifetime is 200% when thetemperature is reduced 10°C. The lifetime of the inverter is therefore determined bytemperature.If the inverter is used at high temperatures, the aluminum electrolytic capacitor may wearout even though other parts remain normal. In this case, the aluminum electrolyticcapacitor must be replaced to keep the inverter working.

Part name Standardreplacement Replacement procedure

Cooling fan 2 or 3 years Replace with a new partSmoothingcapacitor 5 years Investigate and replace

with new part if necessary.

Relays Investigate and replacewith new part if necessary.

Life

tim

e

"Arrhenius law"

Temperature

Page 75: Nais vf 8 z manual

74

Checkfrequency

Installationcondtion

Ambient temperature,relative humidity, dust,etc.

See page 10 forinstallationprecautions.

Ambient temp.:See page 10 forinstallationprecautions.

Relative humidity:90% max.

Thermo meter

Hygrometer

Wholesystem

Abnormal vibration andnoise. Visual inspection and

audible checkNormal appearanceand noise

Powersupplyvoltage

Is the main circuitvoltage normal? Measure the input

voltage 342 – 506V (400V) Voltmeter

General

(1) Check if allfastenings aretight.

(2) Any indication ofoverheating on anypart?

(3) Clean

(1) Tighten fastenings

(2) Visual inspection (1) (2) Normal

Connectedelectricalconductorsand wires

(1) Are electricalconductorscrooked?

(2) Is the coverbroken?

Visual inspection Normal

Transfor-mer reactor Strange smells? By smell (inverter

control panel) Normal

Terminalblocks Is there any damage? Visual inspection Normal

Transistorand diodemodules

Check the resistancebetween terminals.

Remove the wires fromthe main circuitterminal block andmeasure theresistance.

Ohm meter

Smoothingcapacitor

(1) Are there any liquidleaks?

(2) Is the safety valveexposed ordistorted?

(3) Measureelectrostaticcapacity.

(1) Visual inspection

(2) Visual inspection

(3) Using acapacitance meter

(1) Normal

(2) Normal

(3) Minimum 85% ofrated capacity

Capacitancemeter

Relays andcontactors

(1) Is there anyvibration duringoperation?

(2) Check the timeroperation.

(3) Are the contactsdamaged?

(1) Audible check

(2) Measure time(inverter controlpanel)

(3) Visual inspection

Normal (For (2), referto the specificationsmanual)(inverter control panel)

Stopwatchand universalcounter

Continued on following page.

Maintenance and Inspection(Inspection Table)

Loca

tion

Ever

y 2

year

s

Year

ly

Dai

ly

Mai

n ci

rcui

tW

hole

sys

tem

Component Check Check method Test criteria Instrument

Page 76: Nais vf 8 z manual

75

Checkfrequency

Resistor

(1) Check for cracks inthe insulation.

(2) Check fordisconnection.

Visual inspection Normal

Operationchecks

(1) Check output linevoltage balancebetween phasesduring inverteroperation withoutapplication.

(2) Test the sequenceprotectionoperations, checkprotection anddisplay circuits arenormal.

(1) Measure voltagebetween outputterminals.

(2) Short-circuit faultalarm outputterminals on test.

(1) Line outputbalance is 4V max.

(2) Sequenceprotection circuit isoperating normally.

Rectifier typevoltmeter

All parts

(1) Any strange smellsor discoloration?

(2) Is there heavyrusting?

Visual inspection andsmell Normal

Capaci-tor

Any trace of liquidleaks or deformation? Visual inspection

Cooling fan

(1) Check forabnormalvibrations or noise.

(2) Check allconnectors aretight.

(1) Audible check

(2) Tighten fastenings Normal

Display unit(1) Are any LEDs not

working?(2) Clean

Visual inspection Normal

Meter Are all readingscorrect? Check the meter

indicating value.

Must conform tospecified and setvalues.

VoltmeterAmmeter

General

(1) Check forabnormalvibrations or noise.

(2) Strange smells?

(1) Audible check andvisual inspection

(2) Smell motor andtouch motor

Normal

Ever

y 2

year

s

Year

ly

Dai

ly

Loca

tion

Coo

ling

syst

emM

otor

Dis

play

Parts

Con

trol a

nd p

rote

ctio

n ci

rcui

ts

Component Check Check method Test criteria Instrument

Page 77: Nais vf 8 z manual

76

Rated specifications

400V Three Phase Series

Product No. Applied motoroutput (kW)

Rated outputcurrent (A)

Rated outputcapacity(kVA)****

Power supplycapacity(kVA)****

Mass(kg)

BFV80554Z 5.5 12 9.6 13.6 4.0

BFV80754Z 7.5 17 13.5 17.6 4.2

BFV81104Z 11 22 17.5 21.1 10.0

BFV81504Z 15 31 24.7 27.7 10.0

BFV81904Z 19 38 30.3 32.7 13.0

BFV82204Z 22 43 34.3 36.7 13.0

BFV83004Z 30 61 48.6 52.6 20.0

BFV83704Z 37 70 55.8 59.8 24.0

*Rated output capacity is specified for output voltage of 460V.*Power supply capacity depends on power supply impedance.

It should equal or exceed the capacity specified above.

Note) The rated output current is for a carrier frequency of 10kHz or less.When using at 12.5kHz or 15kHz, decrease the rated current to the following valuesand use.

1) 5.5~22kW• 12.5kHz : (rated current) × 0.9• 15.0kHz : (rated current) × 0.8

2) 30, 37kW• 12.5kHz : (rated current) × 0.7• 15.0kHz : (rated current) × 0.6

Specifications

Page 78: Nais vf 8 z manual

77

Standard specifications

400V Three Phase SeriesApplied motor output 5.5 to 37kW

Rated output voltage 3-phase, 380 to 460V (proportional to power supply voltage)Overload capacity 150% of rated output current for 1 minute (※)

Number of phases,voltage, frequency Three phase, 380 to 460V: 50/60Hz

Voltage variations ±10% of rated AC input voltageFrequency variations ±5% of rated input frequencyInstantaneousvoltage dropresistance

Continuous operation at 330V or more, or at less than 330Vfor 15 ms.

(※ Also equivalent to class 20 overload protection)

Rat

edou

tput

Inpu

t pow

er s

uppl

y

Page 79: Nais vf 8 z manual

78

Common specifications

Output frequencyrange 0.2 to 400Hz

Frequency display Digital displayOutput frequencyaccuracy

±0.5% of selected maximum output frequency (25±10°C) foranalog setting

Out

put f

requ

ency

Frequency settingresolution

Digital setting : 0.01Hz (0.1Hz over 100Hz)Analog setting: 0.1Hz (50/60Hz by parameter setting)

Inverter control High carrier frequency sinusoidal PWM controlCarrier frequency Variable from 0.8 to 15kHz

Start/Stop Select with operation panel buttons, 1a contact signal (either1a, 1b contact signal) or wait time setting (0.1 to 100sec.)

Forward/Reverse Select with operation panel buttons, or 1a contact signal(reverse operation prohibit setting possible)

Jog operation Optional setting for 0.2 to 20HzOptional Accel./Decel Time settings for 0.04 to 1600 seconds

Stop select Select from: ramp-to-stop or coast-to-stop

Reset Select from: reset by power supply or by inputting stop signal.External reset setting is also possible.

Stop frequency Setting from 0.2 to 60Hz

Ope

ratio

n

Instantaneous powerfailure restart

Select from: function OFF, restart at 0 Hz, or restart at thesetting frequency

Frequency settingsignal

Digital setting: Operation panelAnalog setting: 0-5V DC, 0-10V DC, 4-20mA DC, 10kΩpotentiometer, input impedance at 50kΩ(0-5V DC), 20kΩ(0-10V DC), and approx. 350Ω(4-20mA DC)

Voltage/frequencycharacteristic

Select from: 50Hz, 60Hz, optional base frequency setting for 45 to400Hz, constant torque, or square low torque pattern

2nd voltage/ frequencycharacteristics Optional base frequency setting for 45 to 400Hz

Torque boost Optional setting for 0 to 40%

Con

trol

2nd torque boost level Optional setting for 0 to 40%

Page 80: Nais vf 8 z manual

79

Accel./Decel. time 0.04 to 1600 sec. (individual accel. and decel. time setting)Accel./Decel.characteristics Linear/S-character characteristics (selection switchover)

Accel./Decel. time 2, 3,and 4

0.1 to 1600 sec. (individual accel. and decel. time setting) Can belinked with multispeed setting.

Multispeed frequencysettings

Up to 8 preset frequency settings (programmable)Can be linked with accel. and decel. time setting.

Skip frequency settings Up to 3 place settings (skip frequency band setting from 1 to10Hz)

Upper frequency setting Setting for 0.2 to 400HzLower frequency setting Setting for 0.2 to 400HzBias and gainfrequency settings

Bias: set for –99.9 to 400HzGain: set for 0 to 400Hz

External fault trip Select from: auxiliary interlock fault or auxiliary stop (coast-to-stop)

Regenerativebraking 20% min.Brak-

ingtorque DC dynamic

brakingWorking at less than setting stop frequency (braking torque andbraking time settings)

Operation frequencysignal 0 ~ 5V DC

Output signal

Open collector output (50V, 50mA max.)Run signal, arrival signal, frequency detection signal, overloadalarm signal, reverse operation signal (selectable)1c contact output (contact capacity at 250V AC, resistance load at0.5A)Fault alarm signal, run signal, arrival signal, frequency detectionsignal, overload alarm signal, reverse operation signal(selectable)

Operating conditionsOutput frequency, setting frequency (F1) (A2) Line speed display(selection switchover)Output current (A0), output voltage (A1), rotation direction

Fault trip buffers Display when protective functions are activated (last 4 faults arestored).

Current limit Current limit can be set to 1 to 200% of rated output current

Shut-off (stop)Instantaneous overcurrent, over temperature (SC), overcurrent(OC), low voltage (LV), overvoltage (OV), auxiliary interlock (AU),overload/electronic thermal overload (OL), operation error (OP)

Stall prevention Overcurrent stall prevention, regenerative overvoltage stallprevention

Exte

rnal

out

put s

igna

lsD

ispl

ayPr

otec

tion

Brak

ing

Con

trol

Page 81: Nais vf 8 z manual

80

Ambient temperatureand relative humidity

–10°C to +40°C (non-freezing)90% RH max. (non-condensing)

Storage and transporttemperature, relativehumidity

–25°C to +65°C, 95% RH max.

Vibration 5.9 m/s2 (0.6G) max.

Installation condition Altitude of 1000 m or less, indoors, free of corrosive gases anddust

Enclosure IP20 screen-protected typeCooling method Forced air cooling

Envi

ronm

ent

Page 82: Nais vf 8 z manual

ATTENTION

This general purpose inverter has not been designed ormanufactured to be used in machines used in situations involvedwith human lives. Please contact Matsushita Electric when usingthis inverter for special applications such as for movable body,medical purposes, aerospace purposes, nuclear energy control,or sea floor relay devices or systems.

This product has manufactured under tight quality control.However, when using the inverter in important facilities in whichtrouble could cause hazards to human lives, or when a major losscould occur due to trouble, install safety devices to prevent majoraccidents.

When using this product for a load other than a 3-phase ACmotor, please contact Matsushita Electric.

Matsushita Electric Works, Ltd.AUTOMATION CONTROLS GROUP

Head Office : 1048, Kadoma, Kadoma-shi, Osaka 571-8686, JapanTelephone : Japan (81) Osaka (06) 6908-1050Facsimile : Japan (81) Osaka (06) 6908-5781

Matsushita Electric Works (Europe) AG,Rudolf-Diesel-Ring 2, D-83607 Holzkirchen, GermanyTelephone : 49-8024-648-0Facsimile : 49-8024-648-111

AROMAT Corporation,629 Central Avenue, New Providence, New Jersey 07974, U.S.A.Telephone : 1-908-464-3550Facsimile : 1-908-771-5658

Matsushita Electric Works (Asia Pacific) Pte. Ltd.101 Thomson Road, #25-03/05, United Square, Singapore 307591Telephone : 65-255-5473

Matsushita Electric Works (China) Co., Ltd.Suite 201Level 2, Tower W3, The Towers, Oriental Plaza, No.1, East ChangAn Avenue, Dong Cheng District, Beijing, 100005, ChinaTelephone : 86-10-6590-8646

COPYRIGHT C 2004 All Rights Reserved

Page 83: Nais vf 8 z manual

8A2 C71 0000 1               Specifications are subject to change without notice. Printed in China