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thatengineer asked My industrial relay is closing without any input signal connected or the indicator light coming on, what the?
I am using an industrial high current relay to control a Peltier-Cooler. Controlling the relay is a National Instruments DAQ. Even when the signal is off(no indicator light on the relay), the Peltier-Coller is coming on??? Maybe some information on basic function of relays might help, I've done a lot of research with no avail.
And got the following answer:
Measure the current flowing in the circuit. It's possible the level is too high for the relay circuit. It's possible the Peltier-Cooler is defective, or the wiring to the cooler has a short somewhere. Or you have wired the cooler in backwards. Remove the cooler and replace it with a known-good low-current device, then test the relay. == The relay is defective. Get a replacement. If this is a SSR - Solid State Relay, the output transistor or triac could be shorted. These output circuits can be damaged by current overloads.