1

™ Digital Multifunction Meter

Manual for Installation and Use

Measurement of Energies Maximum Demand measurement Programmable features Separate models for Unidirectional and bidirectional measurement Suitable for 50Hz & 60Hz supply RS485 MODBUS communication Freeze mode feature

Doc. No. 4D060193 Rev. F L&T Electrical & Automation

2

Sl. No. Descriptions Page No.

1 General Details 2

2 Front Panel Details 2

3 Mechanical Dimensions 4

4 Installations 4

5 Programming the meter 5

6 Warranty & Disclaimer 6

Appendix 1: Technical Specifications 7

Appendix 2: Modbus communication details 8

Appendix 3: Addressing in Modbus 9

Appendix 4: Display Parameters 12

Appendix 5: Wiring Diagrams 15

™ is a digital panel meter for measuring electrical parameters with multiple displays in

size 96 x 96 mm. The meter is designed with high performance processor to combine measurements of

both instantaneous and cumulative values in an electrical system. The device is built with bright 7

segment displays and provides high-resolution value of various parameters. The parameters can be

scrolled up & down by front panel push buttons. The parameters like CT / PT ratings, baud rates, port

address, demand parameters etc, can set by push buttons on the front panel as well through as modbus

protocol (RS485). The programming parameters are password protected. Meter is provided with

measurement energies, MDs with programmable integration period. The unique feature of multifunction

meters, it is provided with two relays which are used to trip circuits/isolate circuits in case of predefined

fault/threshold conditions. Relays are available for specific models only.

2.1 Display & LED indications

™ Digital Multifunction Meter features with 7

segment display and LEDs for multipurpose indications.

1. Bright 7 segment Displays for displaying the

Parameters.

2. LEDs for indicating units (kilo, Mega & Giga values.)

3. LEDs for indicating Reverse of individual phases. If

any of the phases are reversed, the reversed phase is

indicated through LEDs.

4. LEDs for indicating Lead, export and communication.

2.2 Front panel push buttons:

Three push buttons Up , Down & Mode to do following functions:

1. Scrolling through display parameters

2. Programming of parameters 3. Increase /Decrease the numeric values during programming

Figure 1 Front view of Digital Multifunction Meter

2. Front Panel Details:

1. General Details:

Table of Contents

™ Digital Multifunction Meter

2.3 Programming using push buttons

Sl. No

1 Press up key and down key

mode. Meter displays PASS

2

Enter the password for user authentication (Default password is

0000). Press mode key.

programming mode once meter displays “PASS” (Password).

3 If password is correct, meter displays

programming parameter.

4 If entered password is incorrect, meter displays

return to display parameters.

5 Press up key to scroll the main menu programming pages.

6 Press mode key to select the page. Parameter default / Previous

value with first digit blinking

7 Press up key to increment the cursor position value

8 Press down key to shift cursor position to right

9

i) Press mode key to update the values. “

ii) Press up key to accept the entered value/

entered value.

10 Press up & down key to exit programming mode, meter will display

‘ESCP’ & ‘rSEt’ then followed by restart

11

For manual reset press up key and mode key simultaneously

manual scroll mode. Meter displays “rSt” and continued by display

parameter.

12

In Freeze mode, ‘Desired parameter can be monitored continuously’.

1) To enter Freeze mode:

Press ‘MODE’ key

parameter. The meter displays “

show display parameter on which it

2) To exit Freeze mode

Press ‘MODE’ key for 3sec

and continues to display scroll m

3) In case of power fail and

If the freeze mode is activated,

Displays “diSP StAY On” and then continue to show display

parameter on which it was freezed

Time out for programming mode is 1minute.After

2.4 Display Features:

On Power ON, following will be displayed sequentially: 1) All the segments of 7 segment dis 2) The firmware version 3) Display parameters The meter has a provision to scroll the display parameters automatically after ~3 seconds. The meter

enters into the manual mode by up/down key

every up & down key press respectively. If key is not pressed for ~5 minutes, it returns to auto scroll

mode. Any display parameter can be monitored continuously using

3

2.3 Programming using push buttons

Action with keys

down key simultaneously to enter to programming

PASS & 0000 with first digit blinking.

Enter the password for user authentication (Default password is

Password can be changed in the

once meter displays “PASS” (Password).

If password is correct, meter displays ACPt followed by first

programming parameter.

If entered password is incorrect, meter displays PErr & meter will

return to display parameters.

to scroll the main menu programming pages.

to select the page. Parameter default / Previous

value with first digit blinking

to increment the cursor position value

to shift cursor position to right

to update the values. “UUPd” will be displayed.

to accept the entered value/down key to skip the

to exit programming mode, meter will display

then followed by restart

For manual reset press up key and mode key simultaneously in

. Meter displays “rSt” and continued by display

Freeze mode, ‘Desired parameter can be monitored continuously’.

mode:

key continuously for 3sec to Freeze the

meter displays “diSP StAY On” and then continues to

show display parameter on which it has been freezed.

mode (To Unfreeze):

for 3sec, the meter displays “diSP StAY OFF”

display scroll mode.

case of power fail and resume:

f the freeze mode is activated, on power resume, Meter

AY On” and then continue to show display

parameter on which it was freezed.

Time out for programming mode is 1minute.After time out, meter will exit programming mode.

will be displayed sequentially: 1) All the segments of 7 segment display and all the LEDs will glow

The meter has a provision to scroll the display parameters automatically after ~3 seconds. The meter

up/down key press. In manual mode, display shall scroll up & down by

espectively. If key is not pressed for ~5 minutes, it returns to auto scroll

Any display parameter can be monitored continuously using ‘freeze mode

Display Status simultaneously to enter to programming

Pages scrolling

0/1/2/3/4/5/6/7/8/9

- - - -

” will be displayed. Step i

step ii

to exit programming mode, meter will display

Freeze mode, ‘Desired parameter can be monitored continuously’.

to Freeze the

and then continues to

AY OFF”

, Meter

AY On” and then continue to show display

time out, meter will exit programming mode.

The meter has a provision to scroll the display parameters automatically after ~3 seconds. The meter

press. In manual mode, display shall scroll up & down by

espectively. If key is not pressed for ~5 minutes, it returns to auto scroll

freeze mode’ feature.

4

Figure 2 Mechanical Dimensions

1. Dimensions of panel cut-out (92mm x 92mm) for mounting multifunction is shown in Figure 3. The connection diagram for multifunction meter is shown in figure 8, 9 &10. Care to be taken for proper connection.

2. Auxiliary voltage: Multifunction meter will power ON with

auxiliary voltage (Range from 80V to 300V AC). 3. ™ Multifunction meter is suitable for

operating in star connected system and delta connected system. For connection refer Figure 4 / Figure 5. The meter should be programmed appropriately for the type of system. The default setting is for 3P4W system. To change the settings to 3P3W configuration mode, change “cnfg” setting from “0000” to “0001” in programming mode. Refer section 5.2 for details.

4. The rating of input measurement current is 5A/1A (maximum current rating is 6A/1.2A respectively).In case of higher current measurement, external Current Transformers (CT) to be used. The CT ratios need to be programmed appropriately. Refer section 5.2 for programming details. The ‘terminal S1’->’terminal S2’ is forward direction and ‘terminal S2’->’terminal S1’ is reverse direction. In case of reverse connection the meter is capable of detecting the reverse connection & will indicate through reverse LEDs. In case of Model C the forward direction is based on majority current lines. The reverse current detection logic is applicable for 3P4W connection only.

5. Maximum measuring input voltage is 300V phase to neutral. External potential transformers are to be used for high voltage measurement (HV/MV systems). The PT ratios need to be programmed in the meter suitably. Refer section 5.2 for programming details.

6. The meter is provided with two relays, to trip circuits in case of fault\threshold conditions. The setting for fault conditions can be decided by the customer. The default factory settings are available in section 5.1. Relay terminals for relay 1 is RL1C, RL1N and for relay 2 is RL2C, RL2N. Refer section A1.2(Applicable for specific models only).

7. The parameters on display can be monitored remotely using RS485 communication. The terminal connections of RS485 are D+ & D-. Modbus protocol is implemented with RS485 communication. The communication parameters need to be programmed appropriately. For connections details, settings & memory map refer section 5.1 and Appendix 2.

Figure 3 Panel cut out dimension

( 92 x 92 mm )

3. Mechanical Dimensions

4. Installations

5

Check list for programming parameters during installation

S.No. Parameters

1 CT & PT ratios

2 System configuration (3P3W or 3P4W) mode

3 MD integration period

4 Relay operation setting

5 RS485 communication setting

5.1 List of relay programming parameters

Meter is programmed with default factory settings. These parameters can be changed by authenticated user/customer. Relay features are available for specific models only. Refer page 16 for the same.

Sl. No. Parameter Min / Max Value Display Factory setting

1# Lower Voltage cut off Limit 9.6V 9.600V

2# Upper Voltage cut off Limit 264.0V 264.0V

3 Lower Current cut off Limit 0.1A/0.02Aπ

0.100A/0.02Aπ

4 Upper Current cut off Limit 5.867A/1.1734Aπ

5.867A/1.1734Aπ

5 Lower Frequency cut off Limit 40.0Hz 40.00Hz

6 Upper Frequency cut off Limit 70.0Hz 70.00Hz

7 Relay cut-off occurrence persistence time 1 – 9999 s 15 seconds

8 Relay cut off restoration persistence time 1 – 9999 s 15 seconds

π indicates applicable for -/1A meter(otherwise -/5A meter) # Relay cut-off limits is not applicable for 3P3W system, the immediate below table is applicable.

Sl. No. Parameter Min / Max Value Display Factory

setting

1 Lower Voltage cut off Limit 16.62V 16.62V

2 Upper Voltage cut off Limit 457.2V 457.2V

To disable the condition/parameter specific relay trip, set that specific parameter(s) to zero.

Figure 4 3P4W connection ( Terminal connection 17 & 18 not applicable for

Model A meters)

Figure 5 3P3W connection

5. Programming the meter

6

5.2. List of programming parameters

Sl. No. Parameter Min / Max Value Display Factory setting

1 Slave ID 1- 247 1

2 Baud rate 9600 & 19200 9600

3 CT Primary Turns Max up to 9999 1

4 CT Secondary Turns Max up to 9999 1

5 PT Primary Turns Max up to 9999 1

6 PT Secondary Turns Max up to 9999 1

7 Meter wiring configuration 0000 for 3P4W,0001 for 3P3W 0000

8 Programming Password 0000 to 9999 0000

9♦ Node Used for factory purpose only. 0000

10 Number of poles 2,4,6,8,10,12,14,16 2

11α MD Active Integration period (Model B/Model C)

1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, 60

/

30 Minutes

12α MD Apparent Integration Period (Model B/Model C)

1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, 60

/

30 Minutes

13α MD Current (I) Integration Period (Model B/Model C)

1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, 60

/

30 Minutes

14

Command to clear the Power fails count (rest Intr). Step 1: Press mode key meter displays “CnFn reSt”. Step 2: Press mode key meter displays “UUPd”. Step 3: Press up key meter displays ACPt.

Step 1:

Step 2:

Step 3: α Applicable for Model B &C only

♦Not to be changed by customer

Note :-((CtPr/CtSE) * (PtPr/PtSE)) < = 10000000

6.1 Warranty

Larsen & Toubro warrants that Digital Multifunction meter is free from defects in workmanship and

material. Larsen & Toubro’s obligation under this warranty shall be for a period of 18 months from the

date of sale subject to the following terms and conditions provided the notice of defects and

satisfactory proof thereof is given to Larsen & Toubro by its Customer within the warranty period.

1. Larsen & Toubro shall provide only repairs for the sold item.

2. Defective parts shall be serviced or replaced by Larsen & Toubro.

This warranty does not cover any defect in the product caused by accident, misuse, mishandling

(includes improper electrical, mechanical installation), tamper, neglect, alteration/modification or

substitution of any of the components or parts, or any attempt of internal adjustment by unauthorized

service personnel. For applicability of warranty Larsen & Toubro shall be the sole judge.

Under no circumstance shall Larsen & Toubro be liable for any consequential or resulting injury or for

loss, damage or expense directly or indirectly from the use of this product. The foregoing warranty is in

lieu of all other warranties, expressed or implied, and is the sole and exclusive remedy for any claim

arising from any defect in the product.

6.2 Disclaimer

Sufficient care is taken to provide all information regarding the product but Larsen & Toubro does not

claim any responsibility for the damage caused by using the product directly or indirectly.

6. Warranty and Disclaimer

7

A.1.1 Specifications

Auxiliary

circuit

Auxiliary supply 80 to 300VAC

Auxiliary burden < 4VA

Measurement

circuit

Class of accuracy 1.0 as per IEC 62053-21/

0.5 as per IEC 62053-22

Measurement circuit burden < 0.2VA per phase

Input voltage measurement range 10V to 300V(P-N)

17.32V (P-P) to 520V (P-P)

Input current measurement range -/5A 5mA to 6A

-/1A 1mA to 1.2A

Voltage range for class of accuracy 57.7V (P-N) to 277V (P-N)

100V (P-P) to 480V (P-P)

Current range for accuracy class -/5A 250mA to 6A

-/1A 50mA to 1.2A

Line frequency measurement range 50Hz ± 10% & 60Hz ± 10%

(Suitable for both 50Hz & 60Hz supply)

Insulation

properties

Impulse voltage test ±4kV as per IEC 62053-21

AC voltage Test 4kV double insulation as per IEC 62053-21

Insulation resistance 500V DC Voltage as per IS 13779

Electrical

requirements

Test of power consumption As per IEC 62053-21

Voltage dips and interrupts As per IEC 61326-1

Short time over current Protection 20 times of Imax for half a second as per

IEC 62053-21

Electro-

Magnetic

Compatibility

(EMC)

Electrical fast transient/burst immunity

test ±4kV as per IEC 61000-4-4

Electrostatic discharge immunity test ±8kV air discharge , ±6kV contact

discharge as per IEC 61000-4-2

Radiated, radio-frequency,

electromagnetic field immunity test 10 V/m as per IEC 61000-4-3

Immunity to conducted disturbances,

induced by radio-frequency fields 3V as per IEC 61000-4-6

Surge immunity test ±4kV as per IEC 61000-4-5

Rated power frequency magnetic fields 1A/m as per IEC 61000-4-8

Emission Class B as per CISPR 22

Operating

Conditions

Operating Temperature 0 º C to +55 º C

Storage Temperature -20 º C to +70 º C

Humidity 0 to 95% relative humidity non-

condensing

Mechanical

testing

Shock 40g in 3 planes

Vibration 10 to 55Hz,0.15mm peak amplitude

Casing Plastic mould protected to IP51 from

front side

Weight 400gms(approximately)

A.1.2 Relay specifications

Multifunction meter is provided with two normally closed (NC) relays which can be programmed to trip in abnormal system conditions. There will be continuity between the contacts RL1C & RL1N and continuity between the contacts RL2C & RL2N in system healthy condition. The relay trip option can be disabled for one or all of the parameters by setting the corresponding parameter(s) to zero.

Appendix 1: Technical Specifications

8

The relay setting can be programmed for the following fault condition.

1. Abnormal voltage 2. Abnormal current 3. Abnormal frequency The abnormal voltage, current & frequency can be decided by the customer. The upper & lower limit

can be programmed appropriately. Refer section 5.1 for details.

A.2.1 Introduction:

The Default slave ID of meter is 1.In Case of multiple meters connected in a network, the slave IDs to be

unique to network. RS485 modbus protocol allows up to 247 meters to be connected in a network. But

the signal strength of RS485 allows only 32 meters to be connected in a network. Hence to enable

connecting up to 247 meters, repeaters to be connected to improve the signals strength. Figure 7 shows

the typical network connection for RS485 communication. Repeaters are not shown in figure for

simplicity. The value of the termination resistor should be equal to the cable impedance. The cable

impedance can be obtained from the cable manufacturer. In case value of cable impedance is not known,

usually 120Ω, 5W resistor will work fine. The function of the termination resistor is to reduce the

reflection of signals at the ends.

A.2.2 Modbus Address Map for Data read /write: 1. Maximum bytes that can be collected in single query - 180 Bytes 2. Recommended no response timeout – 250 ms 3. Data updating rate for each parameters – 3s minimum 4. Recommended polling frequency for each baud rate – As updating rate for each parameter is 3s.

Anything above 3s is preferred.

Figure 7 Typical connection diagram of RS485

Relay specifications

Continuous Contact Rating 5A

Maximum Switching Voltage 277V

Maximum Switching Current 5A

Maximum Switching Power 1250VA Figure 6 Relay Contacts

Appendix 2: Modbus communication details

9

For changing any programming parameter through modbus, first password has to be entered then

followed by the address of the parameters. Once password is entered the password is enabled for an idle

time of 2 minutes.

Address Parameters Words

40513 Password (PRIDES) for programming 3

Address Parameters Words MF

H-REGS Function code 0x06 is used for writing for following parameters

1.Relay Occurrence / Persistence Time

40337 Relay Occurrence time (in Seconds)(0001 to 9999) 1 1

40338 Relay Persistence time (in Seconds)(0001 to 9999) 1 1

2.Meter Configuration (3W/4W)

42305 0000 for 3-Phase 4-Wire Configuration

0001 for 3-Phase 3-Wire Configuration 1 1

3.Communication Parameters

41025 Meter Address (1 to 247) 1 1

41026 Baud Rate (Only following values are possible

Write 6 for 9600, 7 for 19200) 1 1

4.No of Poles

42561 No of Poles (2 to 16)(only even values) 1 1

Function code 0x10 is used for writing for following parameters

1.External CT/PT Values

41281 CT Primary (1 to 9999) 2 1

41283 CT Secondary (1 to 9999) 2 1

41285 PT Primary (1 to 9999) 2 1

41287 PT Secondary (1 to 9999) 2 1

Note:- (max. (CTprimary/CTsecondary) * (Ptprimary/Ptsecondary)) < = 10000000

2. MD Information

40769* MD1(Apparent MD) - Integration Period 1 1

40770* MD2(Active MD) - Integration Period 1 1

40849* MD3(Current MD)- Integration Period 1 1

(While programming, MD1& MD2 integration periods have to be programmed together. Individual

programming is not supported.MD3 can be programmed separately.)

3.Relay Cut off Limits

40257 Voltage Lower Limit(VL) (9.6<VL<VU) 1 0.01

40258 Voltage Upper Limit(VU) (VL<VU<264) 1 0.01

40259 Current Lower Limit(CL) (0.1<CL<CU) 1 0.01

40260 Current Upper Limit(CU) (CL<CU<5.867) 1 0.01

40261 Frequency Lower Limit(FL) (40<FL<FU) 1 0.01

40262 Frequency Upper Limit(FU) (FL<FU<70) 1 0.01

For all the above relay cut off limits, if value is programmed to zero then that parameter won’t be

considered for relay operations. (ZERO is a valid input value).All programming to be done together.

I-REGS Read Only Registers (Function Code: 0x04)

1.Instantaneous Values

30001 R Phase Voltage 2 0.01

30003 Y Phase Voltage 2 0.01

30005 B Phase Voltage 2 0.01

Appendix 3: Addressing in Modbus

10

30007 R Phase Current 2 0.001

30009 Y Phase Current 2 0.001

30011 B Phase Current 2 0.001

The Phase voltages and phase currents will be without multiplication of PT and CT ratio

respectively.

30013 Active Power R Phase 3 0.0001

30016 Active Power Y Phase 3 0.0001

30019 Active Power B Phase 3 0.0001

30022 Reactive Power R Phase 3 0.0001

30025 Reactive Power Y Phase 3 0.0001

30028 Reactive Power B Phase 3 0.0001

30031 Apparent Power R Phase 3 0.0001

30034 Apparent Power Y Phase 3 0.0001

30037 Apparent Power B Phase 3 0.0001

30040 Power Factor R Phase 2 0.001

30042 Power Factor Y Phase 2 0.001

30044 Power Factor B Phase 2 0.001

30046 Total Active Power 3 0.0001

30049 Total Reactive Power 3 0.0001

30052 Total Apparent Power 3 0.0001

30055 Total Power Factor 2 0.001

30057 Line Frequency 2 0.01

30059 RY-Line Voltage 2 0.01

30061 YB-Line Voltage 2 0.01

30063 BR-Line Voltage 2 0.01

30065 Average Phase Voltage 2 0.01

30067 Average Phase Current 2 0.001

30069** R Phase Voltage Harmonic 2 0.01

30071** Y Phase Voltage Harmonic 2 0.01

30073** B Phase Voltage Harmonic 2 0.01

30075** R Phase Current Harmonic 2 0.001

30077** Y Phase Current Harmonic 2 0.001

30079** B Phase Current Harmonic 2 0.001

30081* Phase Difference-R Voltage & Current 2 0.01

30083* Phase Difference-Y Voltage & Current 2 0.01

30085* Phase Difference-B Voltage & Current 2 0.01

30087* Voltage Unbalance R Phase 2 0.001

30089* Voltage Unbalance Y Phase 2 0.001

30091* Voltage Unbalance B Phase 2 0.001

30093* Current Unbalance R Phase 2 0.001

30095* Current Unbalance Y Phase 2 0.001

30097* Current Unbalance B Phase 2 0.001

30099* Percentage Load R Phase 2 0.01

30101* Percentage Load Y Phase 2 0.01

30103* Percentage Load B Phase 2 0.01

30105* RPM 2 1

30107* Neutral Current 2 0.001

2. Read Cumulative Energies.

31795 Import Apparent energy 3 0.01

31798 Import Active energy 3 0.01

11

31801 Import Reactive Lag energy 3 0.01

31804 Import Reactive Lead energy 3 0.01

31807** Export Apparent energy 3 0.01

31810** Export Active energy 3 0.01

31813** Export Reactive Lag energy 3 0.01

31816** Export Reactive Lead energy 3 0.01

3.Read MD

31891* MD Import Apparent 3 0.0001

31894* MD Import Active 3 0.0001

31897*** Apparent Rising Demand 3 0.0001

31897** MD Export Apparent 3 0.0001

31900*** Active Rising Demand 3 0.0001

31900** MD Export Active 3 0.0001

31903** Import Apparent Rising Demand 3 0.0001

31906** Import Active Rising Demand 3 0.0001

31909** Export Apparent Rising Demand 3 0.0001

31912** Export Active Rising Demand 3 0.0001

4.Cumulative Energy Backups

32050 Import Apparent Energy 3 0.01

32053 Import Active Energy 3 0.01

32056 Import Reactive Energy – lag 3 0.01

32059 Import Reactive Energy – lead 3 0.01

32062** Export Apparent Energy 3 0.01

32065** Export Active Energy 3 0.01

32068** Export Reactive Energy – lag 3 0.01

32071** Export Reactive Energy – lead 3 0.01

5.Read MD Backup

32146* MD Import Apparent Backup 3 0.0001

32149* MD Import Active Backup 3 0.0001

32152** MD Export Apparent Backup 3 0.0001

32155** MD Export Active Backup 3 0.0001

6.Other parameters

31537 No. of Resets 1 1

31617 Total Import Load Time (Days(1) + hr(1)) 2 1

31633 Total Power ON Time (Days(1) + hr(1) 2 1

31638** Total Export Load Time (Days(1) + hr(1) 2 1

31649 Total Import Load Time Backup (Days(1) + hr(1)) 2 1

31654** Total Export Load Time Backup (Days(1) + hr(1) 2 1

31665 Total Power Failure Count 1 1

7.Time Remaining

31681* Time Remaining kVA MD 1 1

31686***/

31683** Time Remaining kW MD 1

1

31691* Time Remaining Current MD 1 1

8.Hour MD Occurred

31697* Hour Import kVA MD Occurred 3 1

31702** Hour Import KW MD Occurred 3 1

31707** Hour Export KVA MD Occurred 3 1

31713*** Hour Import kW MD Occurred 3 1

31713** Hour Export KW MD Occurred 3 1

12

31718** Hour Current MD Occurred 3 1

31729*** Hour Current MD Occurred 3 1

9.Current MD

31745* Read Current MD 3 0.0001

31750* Read Current Rising Demand 3 0.0001

31755* Read Current MD Backup 3 0.0001

* Applicable for model B & C only. ** Applicable for model C only.

*** Applicable for model B only.

Note 1: The 3rd hexadecimal word in MODBUS is for the unit. 1-KILO, 2-MEGA, 3-GIGA. The default unit

of measurement is KILO. If the MODBUS data value is ‘*’, then multiplication factor is not applicable.

Model A & Model B are unidirectional meters and Model C is bi-directional meter.

Sl. No.

Parameter Display Line1

Display Line2

Display Line3

Display Indica-

tion

Display sequence §

A B C

1 Phase voltage U1

U1 Value U2

U2 Value U3

U3 Value R,Y,B 1 1 1

2 Line to line voltage

U12 U12 Value

U23 U23 Value

U31 U31 Value R,Y,B 2 2 2

3 Phase Current A1

A1 Value A2

A2 Value A3

A3 Value R,Y,B 3 3 3

4 Average Voltage, Average current

AU AU Value

AA AA Value

Blank R,Y,B 4 4 4

5 Neutral Current An An Value Blank 5 5

6 Line Frequency F F value Blank 5 6 6

7 Percentage Load PLd1

PLd1 Value PLd2

PLd2 Value PLd3

PLd3 Value R,Y,B 7 7

8 Voltage Unbalance Uub1

Uub1 Value Uub2

Uub2 Value Uub3

Uub3 Value R,Y,B 8 8

9 Current Unbalance Iub1

Iub1 Value Iub2

Iub2 Value Iub3

Iub3 Value R,Y,B 9 9

10 System Power factor

PF-t PF-t Value Blank 6 10 10

11 Power factor R phase

PF-1 PF-1 Value Blank 7 11 11

12 Power factor Y phase

PF-2 PF-2 Value Blank 8 12 12

13 Power factor B phase

PF-3 PF-3 Value Blank 9 13 13

14 RPM rPn rPn Value Blank 10 14 14

15 Phase Angle PA1

PA1 Value PA2

PA2 Value PA3

PA3 Value R,Y,B 15 15

16 Active Power R phase

Apr1 Apr1 value

(MSB) Apr1 value

(LSB)

11 16 16

17 Active Power Y phase

Apr2 Apr2 Value

(MSB) Apr2 value

(LSB) 12 17 17

18 Active Power B phase

Apr3 Apr3 Value

(MSB) Apr3 value

(LSB) 13 18 18

19 Total active power Pr.A Pr.A Value

(MSB) Pr.A Value

(LSB) 14 19 19

20 Apparent Power R phase

Apn1 Apn1 Value

(MSB) Apn1 Value

(LSB) 15 20 20

Appendix 4: Display Parameters

13

21 Apparent Power Y phase

Apn2 Apn2 Value

(MSB) Apn2 Value

(LSB) 16 21 21

22 Apparent Power B phase

Apn3 Apn3 Value

(MSB) Apn3 Value

(LSB) 17 22 22

23 Total apparent power

Pr.AP Pr.AP Value

(MSB) Pr.AP Value

(LSB) 18 23 23

24 Reactive Power R phase

rPr1 rPr1 value

(MSB) rPr1 value

(LSB) 19 24 24

25 Reactive Power Y phase

rPr2 rPr2 Value

(MSB) rPr2 Value

(LSB) 20 25 25

26 Reactive Power B phase

rPr3 rPr3 Value

(MSB) rPr3 Value

(LSB) 21 26 26

27 Total reactive power

Pr.r Pr.r Value

(MSB) Pr.r Value

(LSB) 22 27 27

28 MD Apparent APnd APnd Value

(MSB) APnd Value

(LSB) 28 28

29 Occurrence Time of MD Import Apparent

Days n1-d

Hours n1-h

Minutes n1-n 37 29

30 Rising MD Import Apparent

APrd APrd value

(MSB) APrd value

(LSB) 31 30

31 MD Export Apparent

EPnd EPnd value

(MSB) EPnd value

(LSB) Exp 31

32 Occurrence Time of MD Export Apparent

Days n2-d

Hours n2-h

Minutes n2-n 32

33 Rising MD Export Apparent

EPrd EPrd value

(MSB) EPrd value

(LSB) Exp 33

34

Remaining Time of MD Apparent (Import and Export)

rtn1Y / rt12 Minutes

n.xx Blank 34 34

35 MD Import Active Atnd Atnd value

(MSB) Atnd value

(LSB) 29 35

36 Occurrence Time of MD Import Active

Days n2-dY / n3-d

Hours n2-hY / n3-h

Minutes n2-nY/ n3-n

38 36

37 Rising MD Import Active

Atrd Atrd value

(MSB) Atrd value

(LSB) 32 37

38 MD Export Active

Etnd Etnd value

(MSB) Etnd value

(LSB) Exp 38

39 Occurrence Time of MD Export Active

Days n4-d

Hours n4-h

Minutes n4-n 39

40 Rising MD Export Active

Etrd Etrd value

(MSB) Etrd value

(LSB) Exp 40

41 Remaining Time of MD Active (Import and Export)

rtn2Y / rt34 Minutes

n.xx Blank 35 41

42 MD Current (I) Ind Ind Value Blank 30 42

43 Occurrence Time of MD Current

Days n3- dY / n5-d

Hours n3-hY / n5-h

Minutes n3-nY / n5-n

39 43

44 Average MD current (I)

Ird Ird value Blank 33 44

45 Remaining Time of MD Current

rtn3Y / rt5 Minutes

n.xx Blank 36 45

46 MD Import Apparent backup

APnb APnb value

(MSB) APnb value

(LSB) 40 46

14

47 MD Export Apparent backup

EPnb EPnb value

(MSB) EPnb value

(LSB) Exp 47

48 MD Import Active backup

Atnb Atnb value

(MSB) Atnb value

(LSB) 41 48

49 MD Export Active backup

Etnb Etnb value

(MSB) Etnb value

(LSB) Exp 49

50 MD Current backup

Indb Indb value

(MSB) Indb value

(LSB) 42 50

51 Import Active Energy

IAEn IAEn value

(MSB) IAEn value

(LSB) 23 43 51

52 Import reactive lag Energy

IrEL IrEL Value

(MSB) IrEL Value

(LSB) 24 44 52

53 Import reactive lead Energy

IrEL IrEL Value

(MSB) IrEL Value

(LSB) Lead 25 45 53

54 Import Apparent Energy

IAPE IAPE Value

(MSB) IAPE Value

(LSB) 26 46 54

55 Total Import load run hour Mains

trhY / trFh d.xxx h. xx 27 47 55

56 Total Power on time

tPot d.xxx h. xx 28 48 56

57 Total Power fail count

Pr FAIL Pr value

29 49 57

58 Export Active Energy

EAEn EAEn Value

(MSB) EAEn Value

(LSB) Exp 58

59 Export reactive lag Energy

ErEL ErEL value

(MSB) ErEL value

(LSB) Exp 59

60 Export reactive lead Energy

ErEL ErEL value

(MSB) ErEL value

(LSB) Lead, Exp

60

61 Export apparent Energy

EAPE EAPE Value

(MSB) EAPE Value

(LSB) Exp 61

62 Total Export load run hour Mains

Trrh d.xxx h. xx 62

63 Import Active Energy backup

IAEb IAEb value

(MSB) IAEb value

(LSB) 30 50 63

64 Import Apparent Energy backup

IAPb IAPb value

(MSB) IAPb value

(LSB) 31 51 64

65 Import Reactive Lag Energy backup

IrEb IrEb value

(MSB) IrEb value

(LSB) 32 52 65

66 Import Reactive Lead Energy backup

IrEb IrEb value

(MSB) IrEb value

(LSB) Lead 33 53 66

67 Total load run hour Backup

trhbY / trFb d.xxx h. xx 34 54 67

68 Export Active Energy backup

EAEb EAEb value

(MSB) EAEb value

(LSB) Exp 68

69 Export Apparent Energy backup

EAPb EAPb value

(MSB) EAPb value

(LSB) Exp 69

70 Export Reactive Lag Energy backup

ErEb ErEb Value

(MSB) ErEb Value

(LSB) Exp 70

71 Export Reactive Lead Energy backup

ErEb ErEb Value

(MSB) ErEb Value

(LSB) Exp, Lead

71

72 Total Export load run hour Backup

Trrb d.xxx h. xx 72

73 Phase Distortion-voltage

UH1 UH1 Value

UH2 UH2 value

UH3 UH3 Value R,Y,B 73

74 Distortion-phase Current

AH1 AH1 Value

AH2 AH2 Value

AH3 AH3 Value R,Y,B 74

75 Modbus Slave ID SL.Id SL.Id Value Blank 35 55 75

15

Y Applicable for Model A & B MSB: Most Significant Bit LSB: Least Significant Bit § Blank cells denote feature not applicable for that model.

Figure 8 Model-A, Wiring label for WDM303FDWA0/ WDM303ODWA0 (Left) &

WDM303FDWA1/WDM303ODWA1 (Right)

Figure 9 Model B, Wiring label for WDM303FDNB0/ WDM303ODNB0 (Left)

& WDM303FDNB1/ WDM303ODNB1 (Right)

Figure 10 Model C, Wiring label for WDM303FDNC0/ WDM303ODNC0 (Left) &

WDM303FDNC1/ WDM303ODNC1 (Right)

76 Modbus comm. Baud rate

Baud 9.600 / 19.20

Blank

R phase kilo

36 56 76

77 No. of resets n.rSt n.rSt value Blank 37 57 77

Appendix 5: Wiring Diagrams

16

Second letter from right in Catalogue number represents the model. For example

WDM303FDWA0 represents Model A.

Manufactured by:

L&T Electrical & Automation

Larsen & Toubro

KIADB Industrial Area

Hebbal, Hootagalli

Mysore 570018

Karnataka, INDIA

L&T Electrical & Automation

Sl. No. Variant Catalogue Number

1 MF model A with relay -/5A WDM303FDWA0

2 MF Model B with relay -/5A WDM303FDNB0

3 MF Model C with relay -/5A WDM303FDNC0

4 MF model A without relay -/5A WDM303FDWA1

5 MF Model B without relay -/5A WDM303FDNB1

6 MF Model C without relay -/5A WDM303FDNC1

7 MF model A with relay -/1A WDM303ODWA0

8 MF Model B with relay -/1A WDM303ODNB0

9 MF Model C with relay -/1A WDM303ODNC0

10 MF model A without relay -/1A WDM303ODWA1

11 MF Model B without relay -/1A WDM303ODNB1

12 MF Model C without relay -/1A WDM303ODNC1

L&T Electrical & Automation

Catalogue Numbers