“A time-delay Relay will begin its timing cycle when “energized” or by using a separate input line, which is sometimes referred to as input voltage, signal, or activation in data sheet timing diagrams. The timing diagrams in each data sheet have to be figured out as they will vary from model to model and from device setup to device.
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Q&A
Q: Delay relay trigger difference
A time-delay relay will begin its timing cycle when “energized” or by using a separate input line, which is sometimes referred to as input Voltage, signal, or activation in data sheet timing diagrams. The timing diagrams in each data sheet have to be figured out as they will vary from model to model and from device setup to device.
Viewing this input waveform is critical, it will help you determine if the device needs to be retriggered, and if the input can stay ON, or pulse, or be able to turn off before the timing function activates or completes. More information may be obtained from the circuit of the time delay relay, eg frequency or switching function (NO/NC) normally open/normally closed.
See the delay example below, neither is retriggerable:
§ H3CR-A/-AS/-AP*/-A-301 (11-pin version)
The model only needs a start pulse to start the turn-on delay, the timer starts with the first up pulse and cannot be retriggered until the tick period is complete:
§ H3CR-A8/-A8S/-A8-301 (basically the same, but 8-pin version)
The model requires a continuous voltage to initiate the turn-on delay, and the timer starts when the voltage is applied until the voltage is removed:
For complete timing diagrams and retriggerable diagrams of this series of relays, please refer to pages 13-15/61 of the product data sheet.