I have a problem with an industrial heating element control circuit.
This circuit uses a relay on the "hot side" to apply voltage to the heater and then a triac on the "neutral side" to control power through the heater via an electronic temperature controller.
The problem is that the triac failed, causing an overload to trip. So far, so good. When I arrived at this service call, the machine operator was holding onto the heating element wondering why it was stone cold.
So what happens if that triac had failed and left an open circuit?
That machine operator would have definately been the first to know.
Is this still considered a safe circuit?
This circuit uses a relay on the "hot side" to apply voltage to the heater and then a triac on the "neutral side" to control power through the heater via an electronic temperature controller.
The problem is that the triac failed, causing an overload to trip. So far, so good. When I arrived at this service call, the machine operator was holding onto the heating element wondering why it was stone cold.
So what happens if that triac had failed and left an open circuit?
That machine operator would have definately been the first to know.
Is this still considered a safe circuit?