LT4H/-L DIGITAL TIMER Timersthe LT4H digital timer. • Seesaw switches ensure easy operation. • IP66 environmental protection. • Shortened body (70.1 mm 2.760 inch underhead)

34

Features1. Bright and Easy-to-Read DisplayA brand new bright 2-color back lightLCD display. The easy-to-read screen inany location makes checking and settingprocedures a cinch.2. Simple OperationSeesaw buttons make operating the uniteven easier than before.3. Short Body of only 64.5 mm 2.539inch (screw terminal type) or 70.1 mm2.760 inch (pin type)With a short body, it is easy to install ineven narrow control panels.4. Conforms to IP66’s WeatherResistant StandardsThe water-proof panel keeps out waterand dirt for reliable operation even inpoor environments.

5. Screw terminal (M3.5) and PinTypes are Both Standard OptionsThe two terminal types are standardoptions to support either front panelinstallation or embedded installation.6. Changeable Panel CoverAlso offers a black panel cover to meetyour design considerations.7. Compliant with UL, c-UL and CE.

481.890

481.890

64.52.539

Pin type Screw terminal type

Time range Operating mode Output Operating voltage Power down insurance Terminal type Part number

9.999 s (0.001 s~)99.99 s (0.01 s~)999.9 s (0.1 s~)9999 s (1 s~)99 min 59 s (1 s~)999.9 min (0.1 min~)99 h 59 min (1 min~)999.9 h (0.1 h~)

Power ON delay (1)Power ON delay (2)

Signal ON delaySignal OFF delayPulse One-shotPulse ON-delaySignal Flicker

Totalizing ON-delay(8 modes)

Relay(1 c)

Transistor(1 a)

100 to 240 V AC

24 V AC

100 to 240 V AC

24 V AC

12 to 24 V DC

12 to 24 V DC

Available

11 pins

Screw terminal

11 pins

Screw terminal

11 pins

Screw terminal

11 pins

Screw terminal

LT4H-AC240V

8 pins LT4H8-AC240V

LT4H-AC240VS

LT4H-AC24V

8 pins LT4H8-AC24V

LT4H-AC24VS

LT4HT-AC240V

8 pins LT4HT8-AC240V

LT4HT-AC240VS

LT4HT-AC24V

8 pins LT4HT8-AC24V

LT4HT-AC24VS

11 pins

Screw terminal

11 pins

Screw terminal

LT4H-DC24V

8 pins LT4H8-DC24V

LT4H-DC24VS

LT4HT-DC24V

8 pins LT4HT8-DC24V

LT4HT-DC24VS

Product types

UL File No.: E122222C-UL File No.: E122222LT4H Timers

mm inch

* A rubber gasket (ATC18002) and a mounting frame (AT8-DA4) are included.

DIN 48 SIZE DIGITAL TIMER

LT4H/-LTimers

RoHS Directive compatibility informationhttp://www.nais-e.com/

35

Part names

DOWN

UP

LOCK

RESET

smhLOCKRSTOP.

LT4H

TIMERTime delay indicatorElapsed time display

Set time display

Time units display

Up keys

Down keys

Controlled output indicator

Reset indicator

Lock indicator

Reset switch

Lock switch

(Countdown time display)

ON87654321

DIP switches

(Same for screw terminal type and 8-pin type)

LT4H/-L

Features1. Economically priced in anticipationof market needs.• Economically priced to provide

excellent cost performance.2. Display is a bright reflective-typeLCD.3. Inherits all of the characteristics ofthe LT4H digital timer.• Seesaw switches ensure easy

operation.• IP66 environmental protection.• Shortened body (70.1 mm 2.760 inch

underhead).

4. Compliant with UL, c-UL and CE.

481.890

481.890

64.52.539

UL File No.: E122222C-UL File No.: E122222LT4H-L Timers

mm inch

Product typesTime rangeProduct name Operating mode Output Operating voltage Power down

insurance Terminal type Part number

9.999 s (0.001 s~)99.99 s (0.01 s~)999.9 s (0.1 s~)9999 s (1 s~)99 min 59 s (1 s~)999.9 min (0.1 min~)99 h 59 min (1 min~)999.9 h (0.1 h~)

LT4H-Ldigital timer

Power ON delay (1)Power ON delay (2)

Signal ON delaySignal OFF delayPulse One-shotPulse ON-delaySignal Flicker

Totalizing ON-delay(8 modes)

Relay(1 c)

Transistor(1 a)

100 to 240 V AC

24 V AC/DC

100 to 240 V AC

24 V AC/DC

12 to 24 V DC

12 to 24 V DC

Available 8 pins

LT4HL8-AC240V

LT4HL8-AC24V

LT4HLT8-AC240V

LT4HLT8-AC24V

LT4HL8-DC24V

LT4HLT8-DC24V

36

TypeItem

Ralay output typeAC type AC/DC type

100 to 240 V AC, 24 V AC, 24 V AC/DC

50/60 Hz commonMax. 10 V A

5 A, 250 V AC (resistive load)9.999 s, 99.99 s, 999.9 s, 9999 s, 99 min 59 s, 999.9 min, 99 h 59 min, 999.9 h (selected by DIP switch)

Addition (UP)/Subtraction (DOWN)(2 directions selectable by DIP switch)

A (Power ON delay 1), A2 (Power ON delay 2), B (Signal ON delay), C (Signal OFF delay), D (Pulse one-shot),E (Pulse ON delay), F (Signal Flicker), G (Totalizing ON delay) (selectable by DIP switch)

Min. input signal width: 1 ms, 20 ms (2 directions by selected by DIP switch) (The 8-pin type does not have a stop input.)Min. input signal width: 20 ms (The 8-pin type does not have a lock input.)

Open collector input Input impedance: Max. 1 kΩ; Residual voltage: Max. 2 VOpen impedance: 100kΩ or less, Max. energized voltage: 40V DC

7-segment LCD (LT4H, LT4H-L common), Elapsed value (backlight red LED), Setting value (backlight yellow LED)

EEP-ROM (Min. 105 overwriting)

± (0.005 % + 50 ms) in case of power on start± (0.005 % + 20 ms) in case of input signal start

Operating voltage: 85 to 110%Temperature: –10 to +55°C +14 to +131°FMin. input signal width: 1ms

Timed-out 1 Form C100 mΩ (at 1 A 6 V DC)

Ag alloy/Au flash

Min. 2 × 107 ope. (Except for switch operation parts)

1.0 × 105 ope. (At rated control voltage)

85 to 110 % of rated operating voltage

2,000 Vrms for 1 min: Between live and dead metal parts (Pin type)2,000 Vrms for 1 min: Between input and output

2,000 Vrms for 1 min: Between live and dead metal parts (11-pin)2,000 Vrms for 1 min: Between input and output1,000 Vrms for 1 min: Between contacts

Between live and dead metal partsMin. 100 MΩ: Between input and output (At 500V DC)

Between contacts

Min. 100 MΩ: Between live and dead metal partsBetween input and output (At 500V DC)

Max. 0.5 s

10 to 55 Hz: 1 cycle/min single amplitude of 0.35 mm .014 inch (10 min on 3 axes)10 to 55 Hz: 1 cycle/min single amplitude of 0.75 mm .030 inch (1 h on 3 axes)

Timed-out 1 Form A (Open collector)——

—

Min. 107 ope. (At rated control voltage)

12 to 24 V DC

—Max. 3 W

100 to 240 V AC, 24 V AC, 24 V AC/DC


100 mA, 30 V DC

12 to 24 V DC

—Max. 3 W

DC typeTransistor output type

AC type AC/DC type DC type

Rating

Timeaccuracy(max.)

Contact

Life

Electrical

Mechanical

Operatingconditions

Rated operating voltage

Rated frequencyRated power consumptionRated control capacityTime range

Time counting direction

Operation mode

Start/Reset/Stop inputLock input

Input signal

IndicationPower failure memorymethodOperating time fluctuationTemperature errorVoltage errorSetting errorContact arrangementContact resistance (Initial value)Contact material

Mechanical (contact)

Electrical (contact)

Allowable operating voltage range

Breakdown voltage(Initial value)

Insulation resistance(Initial value)

Operating voltage resettime

Max. 65° C (under the flow of nominal operating current at nominal voltage) —Temperature rise

FunctionalDestructive

Vibrationresistance

Min. 98 m 321.522 ft./s2 (4 times on 3 axes)Min. 294 m 964.567 ft./s2 (5 times on 3 axes)

–10° C to 55° C +14° F to +131° FMax. 85 % RH (non-condensing)

860 to 1,060 h Pa—

8-pin/11-pin/screw terminalIP66 (front panel with rubber gasket)

20 % or less — 20 % or less


Ambient temperatureAmbient humidityAir pressureRipple rate

ConnectionProtective construction

Shockresistance

Specifications

[ ]

LT4H/-L

Applicable standardSafety standard EN61812-1 Pollution Degree 2/Overvoltage Category II

EMC

(EMI)EN61000-6-4Radiation interference electric field strengthNoise terminal voltage(EMS)EN61000-6-2Static discharge immunity

RF electromagnetic field immunity

EFT/B immunity

Surge immunityConductivity noise immunityPower frequency magnetic field immunityVoltage dip/Instantaneous stop/Voltage fluctuation immunity

EN55011 Group1 ClassAEN55011 Group1 ClassA

EN61000-4-2 4 kV contact 8 kV air

EN61000-4-3 10 V/m AM modulation (80 MHz to 1 GHz) 10 V/m pulse modulation (895 MHz to 905 MHz)

EN61000-4-4 2 kV (power supply line) 1 kV (signal line)

EN61000-4-5 1 kV (power line) EN61000-4-6 10 V/m AM modulation (0.15 MHz to 80 MHz) EN61000-4-8 30 A/m (50 Hz) EN61000-4-11 10 ms, 30% (rated voltage)

100 ms, 60% (rated voltage)1,000 ms, 60% (rated voltage)5,000 ms, 95% (rated voltage)

37

Dimensions• LT4H digital timer

(units: mm inch)Tolerance: ±1.0 ±.039

Terminal layouts and Wiring diagrams• 8-pin type

Relay output type Transistor output type

Relay output type Transistor output type• Screw terminal type

• Dimensions for embedded installation (with adapter installed)

• Dimensions for front panel installations • Installation panel cut-out dimensions

The standard panel cut-out dimensions are shownbelow. Use the mounting frame (AT8-DA4) and rub-ber gasket (ATC18002).

• For connected installations

Note) 1: The installation panel thickness should be between 1and 5 mm .039 and .197 inch.

Note) 2: For connected installations, the waterproofing abilitybetween the unit and installation panel is lost.

LT4H

TIMER

RESET

LOCK

UP

h m s

OP.RSTLOCK

DOWN

�48�1.890

5.5.217

55.62.189

14.5.571

7.5.295

�44.5�1.752

7.5.295

5.5.217

64.52.539

�44.5�1.752

Screw terminal type (Flush mount)

Screw terminal type Pin type

Pin type (Flush mount/Surface mount)

LT4H

TIMER

RESET

LOCK

UP

DOWN

OP.RSTLOCK h m s

Mounting frame for flush mountAT8-DA4 (supplied)

1.039

�44.5�1.752

Rubber gasketATC18002 (supplied)

Panel

63.52.500

481.890

662.598

501.969

481.890

LT4H

TIMER

UP

OP.RSTLOCK

DOWN

LOCK

RESET

smh

Mounting frame for flush mountAT8-DA4 (supplied)

PanelRubber gasketATC18002 (supplied)

1.039

11-pin type(11p cap AT8-DP11 sold separately)

8-pin type(8p cap AD8-RC sold separately)

481.890

903.543

481.890

662.598

501.969

DIN rail terminal block(8-pin type AT8-DF8Ksold separately)(11-pin type AT8-DF11Ksold separately)

Device installation railAT8-DLA1(sold separately)

95.5(90.0)3.760

(3.543) ( ) dimension is for 8-pin type.

80 min.3.150

80 min.3.150

45+0.60 1.772+.024

0

45+0.60

1.772+.0240

A

A = (48 × n – 2.5) +0.60

45+0.60

1.772+.0240

8

5

17

6

2

34

Operatingvoltage– +

N.O.

N.C.Start

Reset


8

5

17

6

2

34

Start

Reset

• 11-pin typeRelay output type Transistor output type


N.O.N.C.

3

54

21 11

1098

76

Reset

Lock

StartStop


3

54

21 11

1098

76

Reset

Lock

StartStop

Operatingvoltage+ –

54321

109876

N.O.

N.C.

Reset

Lock

StartStop


54321

109876

Reset

Lock

StartStop

LT4H/-L

Note) For connecting the output leads of the transistor output type, refer to5) Transistor output on page 48.

38

Setting the operation mode, time range, and timeSetting procedure 1) Setting the operation mode and time range

Set the operation mode and time range with the DIP switches on the side of the LT4H timer.

DIP switches

Setting procedure 2) Setting the timeSet the set time with the keys (UP and DOWN keys) on the front of the LT4H timer.

DIP switchItem

DIP switch No.1 2 3

ON ON ON A: Power on delay 1OFF OFF OFF A2: Power on delay 2ON OFF OFF B: Signal on delayOFF ON OFF C: Signal off delayON ON OFF D: Pulse One shotOFF OFF ON E: Pulse On delayON OFF ON F: Signal FlickerOFF ON ON G: Totalizing On delay

Table 1: Setting the operation mode

Table 2: Setting the time range

Operation mode

Operation mode Refer to table 1123

Minimum input reset, start, andstop signal width 20 ms 1 ms*4

Time delay direction Addition Subtraction5

Time range Refer to table 2678

ONOFF

DIP switch No.6 7 8

ON ON ON 0.001 s to 9.999 sOFF OFF OFF 0.01 s to 99.99 sON OFF OFF 0.1 s to 999.9 sOFF ON OFF 1 s to 9999 sON ON OFF 0 min 01 s to 99 min 59 sOFF OFF ON 0.1 min to 999.9 minON OFF ON 0 h 01 min to 99 h 59 minOFF ON ON 0.1 h to 999.9 h

Time range

Notes: 1) Set the DIP switches before installing the timer.2) When the DIP SW setting is changed, turn off the power once.3) The DIP switches are set as ON before shipping.

ON1 2 3 4 5 6 7 8

DIP switches

(Same for screw terminal type)

Q Elapsed time displayW Set time displayE Time delay indicatorR Controlled output indicatorT Reset indicatorY Lock indicatorU Time units display

I UP keysChanges the corresponding digit of theset time in the addition direction(upwards)

O DOWN keysChanges the corresponding digit of theset time in the subtraction direction(downwards)

P RESET switchResets the elapsed time and the output

{ LOCK switchLocks the operation of all keys on the unit

9

8

7

2

3

4

5

6

11

10

DOWN

UP

LOCK

RESET

sm

1

hLOCKRSTOP.

TIMER

LT4H

• Changing the set time1. It is possible to change the set timewith the up and down keys even dur-ing time delay with the timer.However, be aware of the followingpoints.1) If the set time is changed to less thanthe elapsed time with the time delay setto the addition direction, time delay willcontinue until the elapsed time reachesfull scale, returns to zero, and thenreaches the new set time. If the set time

is changed to a time above the elapsedtime, the time delay will continue until theelapsed time reaches the new set time.2) If the time delay is set to the subtrac-tion direction, time delay will continueuntil “0” regardless of the new set time.2. If the set time is changed to “0,” theunit will operate differently dependingon the operation mode.1) If the operation mode is set to A(power on delay 1) or A2 (power on

delay 2), the output will turn on when thepower supply is turned on. However, theoutput will be off while reset is beinginput.2) In the other modes, the output turnson when the start is input. When theoperation mode is C (signal off delay), D(Pulse one shot), or F (Signal flicker),only when the start input is on does theoutput turn on. Also, when the reset isbeing input, the output is off.

Front display section

* The 8-pin type does not have the stop input, so that the dipswitch can be changed over between reset and start inputs.The signal range of the lock input is fixed (minimum 20 ms).

LT4H/-L

• Power failure memory

The EEPROM is used for power failure memory. It has a life of Min. 105 over-writings.The EEPROM is overwriting with the following timing.

* Be aware that the contents of EEPROM for all modes will be overwritten when power is turned OFF during input to external lock terminals R to E and to .Such an action does not exist by doing lock operation from the front.

67

Output mode Overwrite timingPower ON delay (2) A2 When power is OFFAddition G Change of preset value or start, reset input

When power is OFF after being ONOther modes When power is OFF after changing preset value

39

Operation mode T: Set time t1, t2, t3, ta<T

Operation type

Power on delay (1)

Explanation Time chart

• Set the operation modesection of the DIP switches(no.’s 1, 2, and 3) on theside of the timer as shown.• Clears elapsed time value and starts time

delay at power ON.• After timer completion, stops at the display of

the set value (addition), or stops at “0” (sub-traction).

• Ignores start input.• Stops delay time operation at stop ON.

Restarts delay time operation at stop OFF.

A

Power on delay (2)

A2

Signal on delay

B

Signal off delay

C

Stop

Reset

Output

Power supply

OFFON

OFFON

OFFON

OFFON

T t1 t2 t1+t2=T

OFFON

OFFON

OFFON

OFFON

T t1 t2 t1+t2=T

Stop

Reset

Output

Power supply

OFFON

OFFON

OFFON

OFFON

OFFON

T t1 t2 t1+t2=T

Stop

Start

Reset

Output

Power supply

OFFON

OFFON

OFFON

OFFON

OFFON

T ta tb t

T>ta+tb T>t

Stop

Start

Reset

Output

Power supply

1 2 3ON ON ON

• Set the operation modesection of the DIP switches(no.’s 1, 2, and 3) on theside of the timer as shown.• Elapsed time value does not clear at power

ON. (power outage countermeasure func-tion)

• The output remains ON even after the poweris cut and restarted.

• After timer completion, stops at the display ofthe set value (addition), or stops at “0” (sub-traction).

• Ignores start input.• Stops delay time operation at stop ON.


1 2 3OFF OFF OFF

• Set the operation modesection of the DIP switches(no.’s 1, 2, and 3) on theside of the timer as shown.• Clears elapsed time value at power ON.• Time delay starts at start ON and elapsed

time value or output resets at start OFF.• Instantaneous time delay start at reset OFF

and power ON while start is ON.• Stops delay time operation at stop ON.

Restarts delay time operation at stop OFF.• In order to have the time delay start at power

ON or reset at power OFF, short out the startinput beforehand.

1 2 3ON OFF OFF

• Set the operation modesection of the DIP switches(no.’s 1, 2, and 3) on theside of the timer as shown.• Clears elapsed time value at power ON.• Output control ON at start ON and time delay

start at start OFF.• Elapsed time value clears when start goes ON

again during time delay.• Stops delay time operation at stop ON.


1 2 3OFF ON OFF

LT4H/-L

Notes: 1) Each signal input (start, reset, stop, and lock) is applied by shorting their input terminal to the common terminal (terminal Q for the 8-pin type, terminal E forthe 11-pin type, and terminal for the screw terminal type).

2) The 8-pin type does not have a stop input or lock input.6

40

Operation type

Pulse One-shot

Explanation Time chart

• Set the operation modesection of the DIP switches(no.’s 1, 2, and 3) on theside of the timer as shown.• Clears elapsed time value at power ON.• Time delay starts and output control ON at

start ON.• Turns output control OFF and clears elapsed

time value at time-up.• Ignores start input during time delay.• Stops delay time operation at stop ON.



D

Pulse On delay

E

Signal Flicker

F

Totalizing On delay

G

OFFON

OFFON

OFFON

OFFON

OFFON

T T t1 t2ta

T=t1+t2T>ta

t

Stop

Start

Reset

Output

Power supply

OFFON

OFFON

OFFON

OFFON

OFFON

T t2

T=t1+t2

T Tt1

Stop

Start

Reset

Output

Power supply

T>taOFFON

OFFON

OFFON

OFFON

OFFON

t1 t1

T=t1+t2 T=t1+t2

tat2 t2TT T

Stop

Start

Reset

Output

Power supply

OFFON

OFFON

OFFON

OFFON

OFFON

T t1 t2 t3 ta

T=t1+t2+t3 T>ta

Stop

Start

Reset

Output

Power supply

1 2 3ON ON OFF

• Set the operation modesection of the DIP switches(no.’s 1, 2, and 3) on theside of the timer as shown.• Clears elapsed time value at power ON.• Time delay starts at start ON.• Ignores start input during time delay.• Stops delay time operation at stop ON.



1 2 3OFF OFF ON

• Set the operation modesection of the DIP switches(no.’s 1, 2, and 3) on theside of the timer as shown.• Clears elapsed time value at power ON.• Time delay starts at start ON.• Ignores start input during time delay.• Output control reverses, elapsed time value

clears, and timer delay starts at timer comple-tion.

• Stops delay time operation at stop ON.Restarts delay time operation at stop OFF.

• In order to have the time delay start at powerON or reset at power OFF, short out the startinput beforehand.

1 2 3ON OFF ON

• Set the operation modesection of the DIP switches(no.’s 1, 2, and 3) on theside of the timer as shown.• Elapsed time value does not clear at power

ON. (power outage countermeasure function)• The output remains ON even after the power

is off and restarted.• Stops delay time operation at stop ON.


1 2 3OFF ON ON

LT4H/-L

Notes: 1) Each signal input (start, reset, stop, and lock) is applied by shorting their input terminal to the common terminal (terminal Q for the 8-pin type, terminal E forthe 11-pin type, and terminal for the screw terminal type).

2) The 8-pin type does not have a stop input or lock input.6

T: Set time t1, t2, t3, ta<T

41

Product types

Features1. Wide time rangeThe operation time range covers from0.01 sec. to 9999 hours.The individual setting can be performedon each of 1 and 2 timers.99.99s 99min59s 99h59min999.9s 999.9min 999.9h9999s 9999h2. Bright and Easy-to-Read DisplayA brand new bright 2-color back lightLCD display. The easy-to-read screen inany location makes checking and settingprocedures a cinch.3. Simple OperationSeesaw buttons make operating the uniteven easier than before.4. Short Body of only 64.5 mm 2.539inch (screw terminal type) or 70.1 mm2.760 inch (pin type)With a short body, it is easy to install ineven narrow control panels.

5. Conforms to IP66’s WeatherResistant StandardsThe water-proof panel keeps out waterand dirt for reliable operation even inpoor environments.6. Screw terminal (M3.5) and PinTypes are Both Standard OptionsThe two terminal types are standardoptions to support either front panelinstallation or embedded installation.7. Changeable Panel CoverAlso offers a black panel cover to meetyour design considerations.8. Compliant with UL, c-UL and CE.9. Low PriceAll this at an affordable price to provideyou with unmatched cost performance.

481.890

481.890

64.52.539

8-pin type 11-pin type Screw terminaltype

Time range Operating mode Output Operating voltage Power down insurance Terminal type Part number

99.99s999.9s9999s99min59s999.9min99h59min999.9h9999h

Pulse input:• Delayed one shot• OFF-start flicker• ON-start flicker

Integrating input:• Delayed one shot• OFF-start flicker• ON-start flicker

Relay(1 c)

100 to 240 V AC

Available

8 pins LT4HW8-AC240V

11 pins LT4HW-AC240V

Screw terminal LT4HW-AC240VS

24 V AC

8 pins LT4HW8-AC24V

11 pins LT4HW-AC24V

Screw terminal LT4HW-AC24VS

12 to 24 V DC

8 pins LT4HW8-DC24V

11 pins LT4HW-DC24V

Screw terminal LT4HW-DC24VS

Transistor(1 a)

100 to 240 V AC

8 pins LT4HWT8-AC240V

11 pins LT4HWT-AC240V

Screw terminal LT4HWT-AC240VS

24 V AC

8 pins LT4HWT8-AC24V

11 pins LT4HWT-AC24V

Screw terminal LT4HWT-AC24VS

12 to 24 V DC

8 pins LT4HWT8-DC24V

11 pins LT4HWT-DC24V

Screw terminal LT4HWT-DC24VS

UL File No.: E122222C-UL File No.: E122222

mm inch

LT4H-W

* A rubber gasket (ATC18002) and a mounting frame (AT8-DA4) are included.

DIN 48 SIZE DIGITAL TIMER

LT4H-WTimers

RoHS Directive compatibility informationhttp://www.nais-e.com/

42

Part names

SpecificationsType

ItemRalay output type

AC type100 to 240 V AC, 24 V AC


5 A, 250 V AC99.99s, 999.9s, 9999s, 99min59s, 999.9min, 99h59min, 999.9h, 9999h (selected by DIP switch)

Addition (UP)/Subtraction (DOWN)(2 directions selectable by DIP switch)

Pulse input: Delayed one shot, OFF-start flicker or ON-start flickerIntegrating input: Delayed one shot, OFF-start flicker or ON-start flicker

Min. input signal width: 1 ms, 20 ms (2 directions by selected by DIP switch) (The 8 pin type does not have a stop input.)Min. input signal width: 20 ms (The 8-pin type does not have a lock input.)

Open collector input Input impedance: Max. 1 kΩ; Residual voltage: Max. 2VOpen impedance: 100 kΩ or less, Max. energized voltage: 40 V DC

7-segment LCD, Elapsed value (backlight red LED), Setting value (backlight yellow LED)

EEP-ROM (Min. 105 overwriting)

± (0.005% + 50 ms) in case of power on start± (0.005% + 20 ms) in case of input signal start

Timed-out 1 Form C100 mΩ (at 1 A 6 V DC)

Ag alloy/Au flash

Min. 2 × 107 ope. (Except for switch operation parts)


85 to 110 % of rated operating voltage

2,000 Vrms for 1 min: Between live and dead metal parts (Pin type only)2,000 Vrms for 1 min: Between input and output

2,000 Vrms for 1 min: Between live and dead metal parts (11-pin type only)2,000 Vrms for 1 min: Between input and output1,000 Vrms for 1 min: Between contacts

Between live and dead metal partsMin. 100 MΩ: Between input and output (At 500V DC)

Between contacts

Min. 100 MΩ: Between live and dead metal partsBetween input and output (At 500V DC)

Max. 0.5 s

10 to 55 Hz: 1 cycle/ min single amplitude of 0.35 mm .014 inch (10 min on 3 axes)10 to 55 Hz: 1 cycle/ min single amplitude of 0.75 mm .030 inch (1 h on 3 axes)

Timed-out 1 Form A (Open collector)——

—


12 to 24 V DC—

Max. 3 W

100 to 240V AC, 24V AC50/60 Hz common

Max. 10 V A100 mA, 30 V DC

12 to 24 V DC—

Max. 3 W

DC typeTransistor output type

AC type DC type

Rating

Timeaccuracy(max.)

Contact

Life

Electrical

Mechanical

Operatingconditions

Rated operating voltageRated frequencyRated power consumptionRated control capacityTime range

Time counting direction

Operation mode

Start/Reset/Stop inputLock input

Input signal

IndicationPower failure memorymethodOperating time fluctuationTemperature errorVoltage errorSetting errorContact arrangementContact resistance (Initial value)Contact material

Mechanical (contact)

Electrical (contact)

Allowable operating voltage range

Breakdown voltage(Initial value)

Insulation resistance(Initial value)

Operating voltage resettime

Max 65° C (under the flow of nominal operating current at nominal voltage) —Temperature rise


Vibrationresistance

Min. 98 m 321.522 ft./s2 (4 times on 3 axes)Min. 294 m 964.567 ft./s2 (5 times on 3 axes)

–10° C to 55° C +14° F to +131° FMax. 85 % RH (non-condensing)

860 to 1,060 h Pa—

8-pin/11-pin/screw terminalIP66 (front panel with rubber gasket)

20 % or less — 20 % or less


Ambient temperatureAmbient humidityAir pressureRipple rate

ConnectionProtective construction

Shockresistance

T2T1

T2

DOWN

T1

UP

SET/LOCK

RESET

smhLOCKOP.

TIMER

LT4H-W

Fourth digit First digit

Controlled output indicator

Lock indicator

Reset switch

Set/Lock switch

T1/T2 Operation display

Display for change-over

Set time display

Time units display

Up keys

Down keys

(Subtraction elapsedtime display)

Elapsed time display

between T1/T2 settings

(Same for 8-pin and screw terminal type)

1

DIP switches

2 3 4 5 6 7 8

ON

LT4H-W

Operating voltage: 85% to 110%Temperature: –10°C to +55°C +14°F to +131°FMin. input signal width: 1ms[ ]

43

Dimensions• LT4H-W digital timer

(units: mm inch)Tolerance: ±1.0 ±.039

• Dimensions for flush mount (with adapter installed)

• Dimensions for front panel installations • Installation panel cut-out dimensionsThe standard panel cut-out dimensions are shownbelow. Use the mounting frame (AT8-DA4) and rub-ber gasket (ATC18002).

• For connected installations

Note) 1: The installation panel thickness should be between 1and 5 mm .039 and .197 inch.

Note) 2: For connected installations, the waterproofing abilitybetween the unit and installation panel is lost.

LT4H-W

SET/LOCK

DOWN

T2

T1

LOCK

TIMER

RESET

T2

OP.

T1

m

UP

h s

481.890

44.51.752

44.51.752

7.5.295

5.5 55.6 14.5.217 2.189 .571

(Same for 8-pin type)

5.5 64.5.217 2.539

7.5.295

Screw terminal type (Flush mount)

Screw terminal type Pin type

Pin type (Flush mount/Surface mount)

UP

DOWN

SET/LOCK

RESET

TIMER

LOCK

T2

OP.

T1

T2

T1

mh s

LT4H-W

SET/LOCK

RESET

TIMER

T2

T2LOCK

T1OP.

T1

DOWN

UP

LT4H-W

mh s

PanelRubber gasketATC18002 (supplied)

481.890

481.890

481.890

1.890

501.969

1 63.52.500

662.598

501.969 66

2.598

1

44.51.752

Mounting frame

AT8-DA4 (supplied)

48

Rubber gasketATC18002 (supplied)

Panel

AT8-DA4 (supplied)

903.543

(11p cap AT8-DP11sold separately)

(8p cap AD8-RCsold separately)

11-pin type

8-pin typefor flush mount for flush mountMounting frame

( ) dimension is for 8-pin type.

(90.0)95.5

(3.543)3.760

AT8-DLA1(sold separately)

Device installation rail

(11-pin type AT8-DF11Ksold separately)

DIN rail terminal block(8-pin type AT8-DF8Ksold separately) 80min.

3.150min.

80min.3.150min.

45 0+0.6

1.772 0+.024

45 0+0.6

1.772 0+.024

45 0+0.6

1.772 0+.024

A=(48 × n – 2.5)+0.6 0 A=(1.890 × n – .098)+.024

0

A

When n timers are continuously installed, the dimension(A) is calculated according to the following formula (n:the number of the timers to be installed):

LT4H-WApplicable standard

Safety standard EN61812-1 Pollution Degree 2/Overvoltage Category II

EMC

(EMI)EN61000-6-4Radiation interference electric field strengthNoise terminal voltage(EMS)EN61000-6-2Static discharge immunity

RF electromagnetic field immunity

EFT/B immunity

Surge immunityConductivity noise immunityPower frequency magnetic field immunityVoltage dip/Instantaneous stop/Voltage fluctuation immunity

EN55011 Group1 ClassAEN55011 Group1 ClassA

EN61000-4-2 4 kV contact 8 kV air

EN61000-4-3 10 V/m AM modulation (80 MHz to 1 GHz) 10 V/m pulse modulation (895 MHz to 905 MHz)

EN61000-4-4 2 kV (power supply line) 1 kV (signal line)

EN61000-4-5 1 kV (power line) EN61000-4-6 10 V/m AM modulation (0.15 MHz to 80 MHz) EN61000-4-8 30 A/m (50 Hz) EN61000-4-11 10 ms, 30% (rated voltage)

100 ms, 60% (rated voltage)1,000 ms, 60% (rated voltage)5,000 ms, 95% (rated voltage)

44

LT4H-WTerminal layouts and Wiring diagrams• 8-Pin type

Relay output type Transistor output type Relay output type Transistor output type• 11-Pin type

N.C.

N.O.

8

5

17

6

2

34

(–) (+)Operating

voltage

Start

Reset

8

5

17

6

2

34

(–) (+)Operating

voltage

Start

Reset

Operatingvoltage

N.O.N.C.

3

54

21 11

1098

76

ResetStartStopLock

– +

3

54

21 11

1098

76


ResetStartStopLock

Relay output type Transistor output type• Screw terminal type

54321

109876

N.O.

N.C.

Operatingvoltage

ResetStartStopLock

+ –

54321

109876

ResetStartStopLock


Note) For connecting the output leads of the transistor output type, refer to5) Transistor output on page 48.

45

LT4H-WSetting the operation mode and time rangeSetting procedure 1) Setting the time range (Timer T1/Timer T2)

Set the time range with the DIP switches on the side of the LT4H-W timer.

Setting procedure 2) Setting the operation modeSet the operation mode with the keys on the front of the LT4H-W timer.

Front display section

DIP switchItem

DIP switch No.1 2 3

ON ON ON 0.01 s to 99.99 sOFF OFF OFF 0.1 s to 999.9 sON OFF OFF 1 s to 9999 sOFF ON OFF 0 min 01 s to 99 min 59 sON ON OFF 0.1 min to 999.9 minOFF OFF ON 0 h 01 min to 99 h 59 minON OFF ON 0.1 h to 999.9 hOFF ON ON 1 h to 9999 h

Table 1: Setting the time range (Timer T1)

Table 2: Setting the time range (Timer T2)

Time rangeTime range(Timer T1)

Refer to table 1123

Minimum input reset, start, andstop signal width 20 ms 1 ms*4

Time delay direction Addition Subtraction5

Time range(Timer T2)

Refer to table 2678

ONOFF

DIP switch No.6 7 8

ON ON ONOFF OFF OFFON OFF OFFOFF ON OFFON ON OFFOFF OFF ONON OFF ONOFF ON ON

Time range

Notes: 1) Set the DIP switches before installing the timer.2) When the DIP SW setting is changed, turn off the power once.3) The DIP switches are set as ON before shipping.

* The 8-pin type does not have the stop input, so that the dipswitch can be changed over between reset and start inputs.The signal range of the lock input is fixed (minimum 20 ms).

1 2 3

DIP switches

4 5 6 7 8

ON

Q Elapsed time displayW Set time displayE T1/T2 operation indicatorR T1/T2 setting value

selectable indicatorT Controlled output

indicatorY Lock indicatorU Time units display

I UP keysChanges the corresponding digit of the set time in the addition direc-tion (upwards)

O DOWN keysChanges the corresponding digit of the set time in the subtractiondirection (downwards)

P RESET switchResets the elapsed time and the output

{ SET/LOCK switchChanges over the display between T1/T2 settings, sets the operationmode, checks the operation mode and locks the operation of each key(such as up, down or reset key).

T2T1

T2

DOWN

T1

UP

SET/LOCK

RESET

smhLOCKOP.

LT4H-W

TIMER

11

10

6

5

4

9

8

7

2

13

Fourth digit First digit

1) Setting or changing the operation mode(1) When the UP or DOWN key at the first digit is pressed with the SET/LOCKswitch pressed, the mode is changed over to the setting mode.(2) Now release the SET/LOCK switch.(3) The operation mode in the setting mode is changed over sequentially in the left or right direction by pressing the UP or DOWN key at the first digit, respectively.

(4) The operational mode displayed at present is set by pressing the RESET switch, and the display returns to the normal condition.2) Setting (changing) the time(1) Pressing the SET/LOCK key switches the set value display between T1 and T2. Display the timer (T1 or T2) which is to be set (or changed).(2) After displaying the timer (T1 or T2) which is to be set, press the UP or DOWN key to change the time.• Checking the operation modeWhen the UP or DOWN key at the second digit is pressed with the SET/LOCK switch pressed, the operational mode can be checked.The display returns to the normal condition after indicating the operational mode for about two seconds. (While the display indicates the operational mode for about twoseconds, the other indicators continue to operate normally.)• Setting the lockWhen the UP or DOWN key at the fourth digit is pressed with the SET/LOCK switch pressed, all keys on the unit are locked.The timer does not accept any of UP, DOWN and RESET keys.To release the lock setting, press the UP or DOWN key at the fourth digit again with the set/lock switch pressed.* Operational mode, adding and subtracting and minimum input signal range cannot be set at T1 and T2, respectively.• Changing over the T1/T2 setting displayThe T1/T2 setting display is changed over by pressing the SET/LOCK switch. (This operation gives no effect on the other operations. The set time and elapsed time(residual time) at T1 are linked with those at T2.)• Changing the set time1) It is possible to change the set time with the UP and DOWN keys even during time delay with the timer. However, be aware of the following points.

(1) If the set time is changed to less than the elapsed time with the time delay set to the addition direction, time delay will continue until the elapsed time reaches fullscale, returns to zero, and then reaches the new set time. If the set time is changed to a time above the elapsed time, the time delay will continue until the elapsedtime reaches the new set time.

(2) If the time delay is set to the subtraction direction, time delay will continue until “0” regardless of the new set time.2) When the set times at T1 and T2 are set to 0, the output becomes ON only while the start input is carried out. However, while the reset input is carried out, the outputbecomes OFF.

Ex: Setting operation mode display(PULSE-A example)

Pulse inputOFF-startRepeating operation

Pulse inputOFF-startOne operation

Pulse inputON-startRepeating operation

Integrating inputOFF-startOne operation

Integrating inputON-startRepeating operation

OFF-startRepeating operation

Integrating input

0.01 s to 99.99 s0.1 s to 999.9 s1 s to 9999 s0 min 01 s to 99 min 59 s0.1 min to 999.9 min0 h 01 min to 99 h 59 min0.1 h to 999.9 h1 h to 9999 h

(same for screw terminal type and 8-pin type.)

46

LT4H-W

Delayedone shot

A

: Pulse inputPULSE : Integrating inputINTEGRATION

• The pulse input mode starts the operation by starting thestart input.

• When using the unit by starting it with the power on, short-circuit the start terminal (8-pin: Q to R, 11-pin: E to Y andscrew terminal: to ).96

• Each signal input such as start, reset, stop and lock inputs is applied by short-circuiting its input terminal and common terminal(8-pin type: terminal Q, 11-pin type: terminal E and screw terminal: terminal ) respectively.

• The 8-pin type does not have a stop input or lock input.6

• The integrating input mode is operated by the integratedtime of the start input. In other word, the timer operates onlywhen the start input is performed.• When the elapsed value is cleared by the reset input, theoutput is reset.• When using the unit by starting it with the power on, short-circuit the start terminal (8-pin: Q to R, 11-pin: E to Y andscrew terminal: to ).96

OFF-start/1 operation t1<T1, t2<T2APULSE

Power

Output

Reset

Start

Stop

T1 T2 ta

ta+tb=T1

tctb td t1

tc+td=T2

T1 t2

supply

OFF-start/1 operation t1<T1, t2<T2AINTEGRATION

tb

Stop

Start

Reset

Output

Power

ta T1tc td te tf tg th

ta+tb=T1

t1

tc+td=T2 tg+th=T2

t2

te+tf=T1

supply

OFF-startflicker

B

OFF-start/repeating operation t1<T1, t2<T2BPULSE

tc

Power

Output

Stop

Reset

Start

T2T1 T2T1 ta tb td t1 T1 t2

ta+tb=T1 tc+td=T2

supply

OFF-start/repeating operation t1<T1, t2<T2BINTEGRATION

tb

Start

Reset

Stop

Outputta

Power

T1

tc+td=T2

tetc td tf tg T2T1th t1

ta+tb=T1

t2

tg+th=T2te+tf=T1

supply

ON-start flicker

C

Remarksand notes

ON-start/repeating operation t1<T1, t2<T2CPULSE

Start

Reset

Stop

Output

Powersupply

ta+tb=T1 tc+td=T2

ta tb tc td t1 t2T1T1 T2 T1 T2

ON-start/repeating operation t1<T1, t2<T2CINTEGRATION

tb

Stop

Start

Reset

Output

Power

ta

tc+td=T2

T1tf tgtc td te t1th T1 T2

ta+tb=T1 tg+th=T2

t2

te+tf=T1

supply

OPERATION MODE

• Elapsed value cleared when power is turned on.• Time limit start initiated when start input goes on; start input ignored if time limit interval

is in progress.• Elapsed value cleared when one operation has been completed.

• Elapsed value not cleared when power is turned on (power failure backup function).• When power is turned back on, same status is maintained for output as that previous

to power going off.• Elapsed value cleared when one operation has been completed.


is in progress.


to power going off.


is in progress.


to power going off.

47

1. Terminal wiring1) When wiring the terminals, refer to theterminal layout and wiring diagrams andbe sure to perform the wiring properlywithout errors.2) When using the instrument with anflush mounting, the screw-down terminaltype is recommended. For the pin type,use either the rear terminal block(AT78041) or the 8P cap (AD8-RC) forthe 8-pin type, and the rear terminalblock (AT78051) or the 11P cap (AT8-DP11) for the 11-pin type. Avoid solder-ing directly to the round pins on the unit.When using the instrument with a frontpanel installation, use the DIN rail termi-nal block (AT8-DF8K) for the 8-pin typeand the DIN rail terminal block (AT8-DF11K) for the 11-pin type.3) After turning the unit off, make surethat any resulting induced voltage orresidual voltage is not applied to powersupply terminals W through U (8-pintype) W through P (11-pin type) or and (screw terminal type). (If thepower supply wire is wired parallel to thehigh voltage wire or power wire, aninduced voltage may be generatedbetween the power supply terminals.)4) Have the power supply voltage passthrough a switch or relay so that it isapplied at one time. If the power supplyis applied gradually, the counting maymalfunction regardless of the settings,the power supply reset may not function,or other such unpredictable occurrencemay result.2. Input connectionsThe power circuit has no transformer(power and input terminals are not insu-lated). When an input signal is fed to twoor more timers at once, do not arrangethe power circuit in an independent way.If the timer is powered on and off inde-pendently as shown in Fig. A, the timer'sinternal circuitry may get damaged.Becareful never to allow such circuitry.(Figs. A, B and C show the circuitry forthe 11-pin type.)

21

If independent power circuitry must beused, keep the input contacts or transis-tors separate from each other, as shownin Fig. B.

When power circuitry is not independent,one input signal can be fed to two ormore counters at once, as shown in Fig.C.

3. Input and output1) Signal input type(1) Contact point inputUse highly reliable metal plated contacts.Since the contact point’s bounce timeleads directly to error in the timer opera-tions, use contacts with as short abounce time as possible. Also, select aminimum input signal width of 20 ms.

(2) Non-contact point inputConnect with an open collector. Usetransistors whose characteristics satisfythe criteria given below.VCEO = 20 V min.IC = 20 mA min.ICBO = 6μA max.Also, use transistors with a residual volt-age of less than 2 V when the transistoris on.

8-pin type

Screw terminal type

1 —— 4 3

11-pin type 3 4 5 6 7

6 7 8 9 10

Reset input

Start input

Stop input

Lock input

Reset input

12 to 40V DC

Q

(The above example is for reset input)

8-pin type

Screw terminal type

1 —— 4 3

11-pin type 3 4 5 6 7

6 7 8 9 10

Reset input

Start input

Stop input

Lock input

8-pin type

Screw terminal type

1 — — 4 3

11-pin type 3 4 5 6 7

6 7 8 9 10

PRECAUTIONS IN USING THE LT4H SERIES

* The short-circuit impedance should beless than 1 kΩ.

[When the impedance is 0 Ω, the currentcoming from the start input and stopinput terminals is approximately 12 mA,and from the reset input and lock inputterminals is approximately 1.5 mA.]

Also, the open-circuit impedance shouldbe more than 100 kΩ.

* As shown in the diagram below, from anon-contact point circuit (proximityswitches, photoelectric switches, etc.)with a power supply voltage of between12 and 40 V, the signal can be inputwithout using an open collector transis-tor. In the case of the diagram below,when the non-contact point transistor Qswitches from off to on (when the signalvoltage goes from high to low), the sig-nal is input.

2) The input mode and output modechange depending on the DIP switch set-tings. Therefore, before making any con-nections, be sure to confirm the opera-tion mode and operation conditions cur-rently set.3) The LT4H series use power supplywithout a transformer (power and inputterminals are not insulated). In connect-ing various kinds of input signals, there-fore, use a power transformer in whichthe primary side is separated from theungrounded secondary side as shown inFig. A, for the power supply for a sensorand other input devices so that short-cir-cuiting can be prevented.

102

3

(Fig. A)Input contactpoint or transistor

2

3

10 Powersupply

Inputterminal

terminalInput

102

3

3

2 10

(Fig. B)Input contactpoint or transistor

Powersupply

point or transistorInput contact

terminalInput

terminalInput

(Fig. C)

Powersupply

3

3

Input contactpoint or transistor

102

102

terminalInput

terminalInput

48

Noise wave form (noise simulator)Rise time: 1 nsPulse width: 1 μs, 50 nsPolarity: ±Cycle: 100 cycles/second5) When connecting the operating powersupply, make sure that no leakage cur-rent enters the timer. For example, whenperforming contact protection, if set uplike that of fig. A, leaking current willpass through C and R, enter the unit,and cause incorrect operation. The fig. Bshows the correct setup.

• Surge wave form[± (1.2 × 50) μs uni-polar full wave voltage]

10090

50

30

00 1.2

Time (μs)

Sur

ge v

olta

ge (

%)

50

Peak

T

T

CR

(Fig. A)

(Fig. B)

Operating power supply

Leakage current

R

C

Operating power supply

Load’spower supply

Inductive load

LT4H timer

Diode rating:

IF (forward current): 1 A

VR (reverse voltage): 600 V

Once the wiring to be used is completelyinstalled and prior to installing this timer,confirm that there is complete insulationbetween the wires connected to thepower terminals (2 each) and the wiresconnected to each input terminal. If thepower and input lines are not insulated, ashort-circuit may occur inside the timerand result in internal damage.In addition, when moving your equipmentto a new installation location, confirmthat there is no difference in environmen-tal conditions as compared to the previ-ous location.

4) The input signal is applied by theshorting of each input terminal with thecommon terminal (terminal Q for 8-pintypes, terminal E for 11-pin types andterminal for screw terminal types).Never connect other terminals or volt-ages higher than 40V DC, because itmay destroy the internal circuitry. 5) Transistor output(1) Since the transistor output is insulat-

ed from the internal circuitry by a pho-tocoupler, it can be used as an NPNoutput or PNP (equal value) output.(The above example is 11-pin type)

6

Load

Load’s power supply

LT4H timer

{ O I

As NPN output

Load

Load’s power supply

LT4H timer

As PNP output

{ O I

(2) Use the diode connected to the out-put transistor’s collector for absorbingthe reverse voltage from induced loads.

6) When wiring, use shielded wires ormetallic wire tubes, and keep the wirelengths as short as possible.7) For the load of the controlled output,make sure that it is lower than the ratedcontrol capacity.4. Operation of LT4H digital timer1) Turning on and off the power supplywhile operating in A2* (Power on delay2) or G (Totalizing On delay) will result ina timer error to be generated due to thecharacteristics of the internal circuitry.Therefore, use the start input or stopinput.* Not related to the start input.2) When controlling the timer by turningon the power supply, use only A (Poweron delay 1) or A2 (Power on delay 2).Use of other modes in this situation willresult in timer errors. When using theother modes, control the timer with thestart input or stop input.5. Operation mode and time range set-tingThe operation mode and time range canbe set with the DIP switches on the sideof the timer. Make the DIP switch set-tings before installing the timer on thepanel.The operation mode of LT4H-W seriescan be set with the keys and switches onthe front of the timer.6. Conditions of usage1) Avoid locations subject to flammableor corrosive gases, excessive dust, oil,vibrations, or excessive shocks.2) Since the cover of the timer is made ofpolycarbonate resin, avoid contact withor use in environments containing methylalcohol, benzene, thinners, and otherorganic solvents; and ammonia, causticsodas, and other alkaline substances.3) If power supply surges exceed the val-ues given below, the internal circuits maybecome damaged. Be sure to use surgeabsorbing element to prevent this fromhappening.

4) Regarding external noise, the valuesbelow are considered the noise-resistantvoltages. If voltages rise above thesevalues, malfunctions or damage to theinternal circuitry may result, so take thenecessary precautions.

Operating voltage Surge voltage (peak value)AC type 6,000VDC type

24V AC type1,000V

Power supply terminalsInput

terminalsAC typeDC type

24V AC typeNoise

voltage1,500V 1,000V 600V

Note: With the 8-pin type, there is no diodebetween points I and O.


(e.g., sensor)

Timer

Timer

AC power supply

(e.g., sensor)Input device

Insulation transformer

Timer

Insulation transformer

(Fig. B) Bad exampleAC power supply

(Fig. A) Good exampleAC power supply

Input device

(+)

(–)

(–)

Input device(e.g., sensor)

Alternativecurrent flow

Single coil transformer

(+)

(–)

(+)

(–)

(–)

(–)

49

Display Contents

Malfunctioning CPU.Enter reset input, RESETkey, or restart unit.

The values at start-up before the CPUmalfunction occurred.

0Malfunctioning memory. Seenote.

OFF

Output condition Restoration procedure Preset values after restoration

7. Self-diagnosis functionIf a malfunction occurs, one of the following displays will appear.

Note: Includes the possibility that the EEPROM’s life has expired.

6) Long periods of continuous operationin the time-up completed condition (onemonth or more) will result in the weaken-ing of the internal electrical componentsfrom the generated heat and, therefore,should be avoided. If you do plan to usethe unit for such continuous operation,use in conjunction with a relay as shownin the circuit in the diagram below.

7. Acquisition of CE markingPlease abide by the conditions belowwhen using in applications that complywith EN61812-1.1) Overvoltage category III, pollution level 22) This timer employs a power supplywithout a transformer, so the power andinput signal terminals are not insulated.(1) When a sensor is connected to theinput circuit, install double insulation onthe sensor side.(2) In the case of contact input, use dual-insulated relays, etc.3) The load connected to the output con-tact should have basic insulation.This timer is protected with basic insula-tion and can be double-insulated to meetEN/IEC requirements by using basicinsulation on the load.

4) Please use a power supply that is pro-tected by an overcurrent protectiondevice which complies with the EN/IECstandard (example: 250 V 1 A fuse, etc.).5) You must use a terminal socket orsocket for the installation. Do not touchthe terminals or other parts of the timerwhen it is powered. When installing orun-installing, make sure that no voltageis being applied to any of the terminals.6) Do not use this timer as a safety cir-cuit. For example when using a timer in aheater circuit, etc., provide a protectioncircuit on the machine side.

R

R

T

T

R R

Relay Timer Receive outputfrom contactat relay R


54

DIN SIZE TIMERS COMMON OPTIONS

Note: The socket’s numbering system matches that of the timer terminals.

Terminal sockets (Unit: mm inch, Tolerance: ±1 ±.039)

Sockets (Unit: mm inch, Tolerance: ±1 ±.039)

Type

PM4H-SPM4H-MPM4H-SDPM4H-F8

PM4H-F8RPM4H-W

LT4HLT4H-LLT4H-WQM4HPM4S

(8-pin type)

PM4H-APM4H-F11R

LT4HLT4H-W

(11-pin type)

Appearance

• DIN rail socket (8-pin)

ATC180031

Note: Terminal No.on the main bodyare identifical tothose on the termi-nal socket.

• DIN rail socket (11-pin)

ATC180041

Note: Terminal No.on the main bodyare identifical tothose on the termi-nal socket.

Dimensions Terminal wiring(Top view) Mounting hole dimensions

Type

PM4H-SPM4H-MPM4H-SDPM4H-F8

PM4H-F8RPM4H-W

LT4HLT4H-LLT4H-W

(8-pin type)PM4SQM4H

PM4H-APM4H-F11R

LT4HLT4H-W

(11-pin type)

Appearance

• Rear terminal socket

AT78041

• 8P cap

AD8-RC

• 11P cap

AT8-DP11

Note: The terminal socket’s numbering system matches that of the timer terminals.

Dimensions Terminal wiring(Top view) Mounting hole dimensions

—

—

—

6 5 4 3

7 8 1 2

50 1.969

40 1.575

2- 4.5φ2- .177φ

702.756

702.756

35.51.390

4.157

24.945

19.748M3.5

M.138

4

39

8 7 6 5

1 210 11

2- 4.5φ2- .177φ

50 1.969

40 1.575

702.756

4.157

702.756

29.51.161

30.51.201M3.5

M.138

87 1 2

56 4 3

4

1109

1 1 23

78 6 5

702.756

13.512

0.240±

.0081.575±

2-M4 2-M.157

±0.1

501.969

between the holes whichareparallel drilled.

The minimum distance

(or 4.2 ±0.1.165

screw holes

dia. holes)

702.756

13.512

0.240±

.0081.575±

2-M4 2-M.157

±0.1

501.969

between the holes whichareparallel drilled.

The minimum distance

(or 4.2 ±0.1.165

screw holes

dia. holes)

24.945

702.75650

1.969

30.51.201

702.75650

1.969

3 4 5 6

2 1 8 7

381.496

411.614

21.82716

.630

M3.5 .138

8 712

5 643

81

76

54

32

108

7

1

32

11

5

4

6

9

8.6.33932.5

1.280

31.41.236

8.315

(34.6)(1.362)

261.024

30141.181.551

φφ

φφ

φφ

φφ

268.6.339

8.315

(34.6)(1.362)

1.02432.51.280

31.41.236

30141.181.551

φφ

φφ

φφ

φφ

411.614

21.827

381.496

301.181

φφ

34.61.362

31.41.236

φφ

301.181

φφ

34.61.362

31.41.236

φφ

• Rear terminal socket

AT78051

—

3 9

8

102 1

7654

114 5 6 7 8

3 2 1 10

11

9

43.41.709

451.772

5.197

21.82716

.630

M3.5 .138

43.41.709

21.827

451.772

55

MOUNTING PARTS

AccessoriesPM4H series• Panel cover (Black)

LT4H series• Panel cover (Black)

• Set ring

• Rubber gasket

• Mounting rails (Applicable forDIN and IEC standards)

• Mounting frame

• Fastening plate

ATC18002

AT8-DLA1Length: 1 maluminum

Applicable for PM4H seriesand LT4H series

PM4H-A

ATC18011

PM4H-S

ATC18012

PM4H-M

ATC18013

PM4H-W

LT4H LT4H-W

ATC18014

ATL58011

The black panel cover is also available so that you can change theappearance of the panel by changing the panel cover. The color of thestandard panel cover is ash gray.

When you control the fixed timerange, the setting rings (a set of 2pcs.) make it easy to do the timesetting and keep the time range allthe time. (Excluding PM4H-W)

ATL68011

PM4H-SD

ATC18015

PM4H-F

ATC18016

Applicable for PM4H seriesLT4H series and QM4Hseries

For holding DIN rails

The rubber gasket is enclosed in the PM4H(screw terminal type) and the LT4H series.

AT8-DA4

ATA4806

ATC18001

50.01.969

50.01.969

1.0.039

481.890

48 1.89068 2.677

Oval hole, 40-5.5x15 40-.217x.591

10

.2175.5

155

271.063

2435.9451.378

7.5.295

1.5.059

15

2.75R .108R

1,000

15

±1 39.37 ± .039

15

.591.591.591.394 .394 .197.197 .591

10 5

• Protective cover for DIN 48 size: LT4H, QM4H series • Protective cover for DIN 48 size: QM4H series

AQM4801

Hard type

ATA4806

UP

12.472

501.969

M4M.157

10

10

.394

.394

50.61.992

17.2.677

50.61.992

AQM4803

Flexible type501.969

501.969

11.433

S

RANGEN

POWER

MODE

PM4H-A

OP

S

RANGEN

POWERPM4H-S

OP

S

RANGEN

POWER

MODE

PM4H-M

OP

S

RANGEL

OFF

RANGE

OFF

PM4H-W

ON

RANGEL

S

RANGE--

PM4H-SD

S

L

S

RANGEL

POWERPM4H-F

DOWN

UPLOCK

RESET

TIMER

LT4H

RESET

SET/LOCK

UP

DOWN

TIMER

LT4H-W

DIN SIZE TIMERS COMMON OPTIONS

56

INSTALLING DIN SIZE TIMERInstallations1. Surface mount1) For the timers of PM4H and LT4Hseries, use the pin type timer. With thePM4S and QM4H series, only pin-typetimers are available.

2) Put the terminal socket on the boarddirectly or put it on the DIN rail (Fig. 1).3) Insert the timer into the terminal sock-et and fix it with clip (Fig. 2)4) On DIN rail mounting, mount the timeron the DIN rail tightly to get the properdimension (Fig. 3).

5) 8-pin type should be connected withterminal socket (AT8-DF8K). 11-pin typeshould be connected with terminal sock-et (AT8-DF11K).6) DIN rail (AT8-DLA1) is also available(1 m).2. Flush mount1) For the timers of PM4H and LT4Hseries, it is recommended to use thebuilt-in screw terminal type for flushmount. (Mounting frame and rubbergasket are provided when timer isshipped.)

If the pin type is used, the mountingframe (AT8-DA4) and rubber gasket(ATC18002 for surface waterproofing)that are available at extra costs are nec-essary. If the pin connection socket isthe 8-pin type, use the 8P cap (AD8-RC); or if it is the 11-pin type, use the11P cap (AT8-DP11).

2) How to mount the timer From the panel front, pass the timerthrough the square hole. Fit the mount-ing frame from the rear, and then push itin so that the clearance between themounting frame and the panel surface isminimized. In addition, lock the mount-ing frame with a screw.

3) Caution in mounting the timer• PM4H, and LT4H series�a If the PM4H and the LT4H series areused as the waterproof types, tighten thereinforcing screws on the mountingframes so that the timers, the rubbergaskets, and the panel surfaces aretightly contacted with each other.(Tighten the two screws with uniformforce and make sure that there is no rat-tling. If the screws are tightened tooexcessively, the mounting frame maycome off.)�b If the timer is installed with the panelcover and the rubber gasket removed,the waterproofing characteristic is lost.4) InstallationLoosen the screws on the mountingframe, spread the edge of frame andremove it.

Pull the mountingframe backward whilespreading out its hookswith your thumbs andindex fingers.

5) Correctly connect the pins while see-ing the pin connection diagram.Tighten the terminal screws with a torqueof 0.8 N·cm or less. The screws areM3.5. (screw-tightened terminal type)6) If the pin type is used, the rear termi-nal block (ATC78041) or the 8P cap(AD8-RC) is necessary to connect thepins. For the 11-pin type, use the rearterminal block (ATC78051) or the 11Pcap (AT8-DP11) and avoid directly sol-dering the round pins on the timer.7) Panel cutout dimensions

The standard panelcutout dimensions areshown in the left figure.(Panel thickness: 1 to 5mm .039 to .197 inch)

8) Although thetimers can bemounted adjacentto each other inthis case, it is rec-ommended toarrange themounting holesas shown in theright figure tofacilitate attachingand detaching themounting frame.9) AdjacentmountingAlthough thetimers can bemounted adjacent to each other, remem-ber that the panel surface of PM4H orLT4H series timer will lose its water-resistant effect. (Panel thickness: 1 to 5mm .039 to .197 inch)A = (48 × n – 2.5) (mm)When lining up thetimers horizontally,set the frames insuch a position sothe formed springareas are at thetop and bottom.When lining up thetimers vertically,set the frames insuch a position asthe formed springareas are at theright and left.

+0.6+0

45

+45 00.6

00.6+

1.772 0.024+

1.772 0.024+

80 mm3.150 inchor more

80 mm3.150 inchor more

45 00.6+

1.772 0.024+

45 00.6+

1.772 0.024+

00.645+

A

1.772 0.024+

Formed spring

Formed spring

Terminal socket

(Fig. 1) (Fig. 2)

DIN rail

(Fig. 3)

Rubber gasket

Mounting frame

Panel cover

Push in

Screw

Panel

Screw

Push in

1

2

1

• Pin type

• Screw terminal type

Documents

LT4H/-L DIGITAL TIMER Timersthe LT4H digital timer. • Seesaw switches ensure easy operation. • IP66 environmental protection. • Shortened body (70.1 mm 2.760 inch underhead)