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Discontinued
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LT4H Digital Timers(DIN 48)

Easy-to-read, user-friendly
digital timers with a short body developed to meet market needs

Pin type
Screw terminal type
UL C-UL Recognaized CE Marking

UL/C-UL , CE Approved

Features

1.Bright and Easy-to-Read Display

A brand new bright 2-color back light LCD display. The easy-to-read screen in any location makes checking and setting procedures a cinch.

2.Simple Operation

Seesaw buttons make operating the unit even easier than before.

3.Short Body of only 64.5 mm/ 2.539 inch (screw terminal type) or 70.1 mm/ 2.760 inch (pin type)

With a short body, it is easy to install in even narrow control panels.

4.Conforms to IP66's Weather Resistant Standards

The water-proof panel keeps out water and dirt for reliable operation even in poor environments.

5.Screw terminal and Pin Type are Both Standard Options

6.Changeable Panel Cover

Also offers a black panel cover to meet your design considerations.

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


Setting the Operation Mode, Timer Range, and Time

Setting procedure 1) Setting the operation mode and timer range

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

Setting procedure 2) Setting the time

Set the set time with the keys (UP/DOWN) on the front of the unit.

  • 1.Elapsed time display
  • 2.Set time display
  • 3.Time delay indicator
  • 4.Controlled output indicator
  • 5.Reset indicator
  • 6.Lock indicator
  • 7.Time units display
  • 8.UP keys
    Changes the corresponding digit of the set time in the addition direction (upwards)
  • 9.DOWN keys
    Changes the corresponding digit of the set time in the subtraction direction (downwards)
  • 10.RESET switch
    Resets the elapsed time and the output
  • 11.LOCK switch
    Locks the operation of all keys on the unit

Changing the set time

  • 1.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 full scale, 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 elapsed time 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.If the set time is changed to "0", the unit will operate differently depending on 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 the power supply is turned on. However, the output will be off while reset is being input.
  • 2.In the other modes, the output turns on when the signal is input. When the operation mode is C (signal off delay), D (Pulse one shot), or F (Signal flicker), only when the signal input is on does the output turn on. Also, when the reset is being input, the output is off.

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.

Output mode Overwrite timing
Power ON delay (2) A2 When power is OFF
Addition G Change of preset value or start, reset input
When power is OFF after being ON
Other modes When power is OFF after changing preset value
* Be aware that the contents of EEPROM for all models will be overwritten when power is turned OFF during input to external lock terminals (4) to (3) and [7] to [6]. Such an action does not exist by doing lock operation from the front.

Operation Mode

Operation type Explanation Time chart
Power on delay (1)
(A)

Set the operation mode section of the DIP switches (no.'s 1, 2, and 3) on the side 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" (subtraction).

・Ignores start input.

・Stops delay time operation at stop ON.

・Restarts delay time operation at stop OFF.

Power on delay (2)
(A2)

Set the operation mode section of the DIP switches (no.'s 1, 2, and 3) on the side 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 cut and restarted.

・After timer completion, stops at the display of the set value (addition), or stops at "0" (subtraction).

・Ignores start input.

・Stops delay time operation at stop ON.

・Restarts delay time operation at stop OFF.

Signal on delay
(B)

Set the operation mode section of the DIP switches (no.'s 1, 2, and 3) on the side 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 start input beforehand.

Signal off delay
(C)

Set the operation mode section of the DIP switches (no.'s 1, 2, and 3) on the side 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.

・Restarts delay time operation at stop OFF.

1*Each signal input (start, reset, stop, and lock) is applied by shorting their input terminal to the common terminal (terminal (1) for the 8-pin type, terminal (3) for the 11-pin type, and terminal [6] for the screw terminal type).
2* The 8-pin type does not have a stop input or lock input.
Operation type Explanation Time chart
Pulse One-shot
(D)

Set the operation mode section of the DIP switches (no.'s 1, 2, and 3) on the side 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.

・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 start input beforehand.

Pulse On delay
(E)

Set the operation mode section of the DIP switches (no.'s 1, 2, and 3) on the side 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.

・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 start input beforehand.

Signal Flicker
(F)

Set the operation mode section of the DIP switches (no.'s 1, 2, and 3) on the side 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 completion.

・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 start input beforehand.

Totalizing On delay
(G)

Set the operation mode section of the DIP switches (no.'s 1, 2, and 3) on the side 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.

・Restarts delay time operation at stop OFF.

*1Each signal input (start, reset, stop, and lock) is applied by shorting their input terminal to the common terminal (terminal (1) for the 8-pin type, terminal 83) for the 11-pin type, and terminal [6] for the screw terminal type).
*2 The 8-pin type does not have a stop input or lock input.

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