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

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Waukesha, WI 53189

800-238-7474 • 262-781-3366