What happens when a time delay relay trigger is closed before voltage is applied?

Tuesday: March 13, 2018 : Time Delay Relays


Issue:

I am using a time delay relay with a triggered function. My trigger switch will be closed before I apply voltage to the time delay relay. Will this work?

Solution/Resolution:

In a typical application with a triggered time delay relay, voltage is first applied to the timer, then the trigger is applied to begin the function. Some applications, however, require the trigger to be closed before voltage is applied. Most Macromatic time delay relays will recognize the trigger when applied prior to the application of voltage, however, some will not.

Use the tables below to indicate how each Macromatic product will function when the trigger is applied prior to application of voltage. We strongly suggest: (a) paying very careful attention to your circuit design in this application since this is not the normal method of using triggered time delay relays; and (b) do not use a product family and/or function where we do not recommend the use of this configuration. For further information, please contact Macromatic Controls at 800-238-7474.

Function Name

TR-5 Series 
1138+

TR-6 Series
1707+

TD-8 Series
All

TD-7 Series
All

OLD 
TR-5 Series
A, B & C

1137-

OLD
TR-6 Series
All
1706-

Off Delay RT RT RT RT RT RT
Single Shot RT RT RT RT DNRT DNRT
Watchdog RT RT RT RT RT RT
Single Shot Trailing Edge RT RT RT RT X X
Triggered On Delay X X RT RT X X
Triggered Delayed Interval RT RT RT X RT RT
Single Shot Flasher X X RT X X X
On / Off Delay RT RT RT RT X X
Off Delay–Power Trigger RT RT X X RT RT
Single Shot–Power Trigger RT RT X X DNRT DNRT
Watchdog–Power Trigger RT RT X X RT RT
Memory Latch X X X X X X
All Functions X X X X X X

RT = Recognizes Trigger
DNRT = Does Not Recognize Trigger
X = Function Not Offered in This Product

   

Function Name

SS-8 Series
All

THR Series
All

THS Series
All

TAD1U

TAA2U

ISP

TE-8  

Off Delay RT RT RT X X X X
Single Shot RT RT RT X X X X
Watchdog X RT RT X X X X
Single Shot Trailing Edge X RT RT X X X X
Triggered On Delay X X X X X X X
Triggered Delayed Interval X RT RT X X X X
Single Shot Flasher X X X X X X X
On / Off Delay X RT RT X X X X
Off Delay–Power Trigger X X X X X X X
Single Shot–Power Trigger X X X X X X X
Watchdog–Power Trigger X X X X X X X
Memory Latch X X X X X X X
All Functions X X X RT RT RT RT

RT = Recognizes Trigger
DNRT = Does Not Recognize Trigger
X = Function Not Offered in This Product

©2018 Macromatic Industrial Controls, Inc.

W134N5345 Campbell Drive
Menomonee Falls, WI 53051

800-238-7474 • 262-781-3366

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