A control circuit uses a timer relay to switch ON a load after a set delay. If the load energizes immediately when the circuit is powered, what is most likely wrong?
The timer relay is bypassed or its contacts are shorted
A timer relay is designed to hold its output contacts in one state and change them only after a preset delay has elapsed, so an ON-delay timer should energise the load late, not instantly.
Here the load switches ON the moment power is applied, which means the timing action is being skipped entirely.
For the supply to reach the load without any delay, the timer must effectively not be in the circuit.
That occurs when the timer relay is bypassed in the wiring or its output contacts are shorted or welded closed, so current passes straight through to the load.
A faulty load would fail to turn on at all, not turn on early, so that cannot be the cause.
A wrongly rated control transformer would affect coil operation generally, and a longer time setting would delay the load more, not remove the delay.
Hence, the answer is The timer relay is bypassed or its contacts are shorted.
Similar Questions
Select the relay type that compares currents at two points to detect faults within a protected zone.
In a control panel, why is it necessary to select a contactor with a higher making capacity than the running current of the connected load?
Important Questions from Relays and Voltage Regulators
Select the relay type that compares currents at two points to detect faults within a protected zone.
In a control panel, why is it necessary to select a contactor with a higher making capacity than the running current of the connected load?
