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Contactor not energising with voltage present.

Ben Wallen

Hi there. I was called to an oven fault yesterday and found the circuit incorporated a contactor. I had voltage up to contactor but it would not energise and had no voltage leaving to the oven. 

I changed the contactor thinking it would sort the problem but it made no difference. 

In the top of the contactor where the supply sits there’s an mcb sitting in parallel which appears to feed a fire suppression pump mounted in the extractor hood. My thoughts were that perhaps this could be the issue but I don’t know enough about the suppression unit to test it. Anyway I would have still thought the contactor would pick regardless?

Any ideas would be gratefully received.

cheers

 

Ben 

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    This sounds more like an interlock system - though of course we cannot see it. It is probably worth checking that there is not some other things in the chain with the contactor coil - this may be the equivalent of the emergency stop error, where there is no fault except someone has done something that locks it off.

    Also when you say you get the voltage to the contactor is that a two probe meter reading with one side of the meter on each side of the coil or just verify that live gets to one end of it ? there may be a chain of microswitches in the loop that require the ventilation to be on, or doors open or shut or similar conditions, or a thermal fuse somewhere  and even perhaps a stop button to be released. Do we know what was done to it  since it last worked - such as cleaning or moving or a small fire  ? This may give a clue where to look.

    Mike.

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  • 0

    This sounds more like an interlock system - though of course we cannot see it. It is probably worth checking that there is not some other things in the chain with the contactor coil - this may be the equivalent of the emergency stop error, where there is no fault except someone has done something that locks it off.

    Also when you say you get the voltage to the contactor is that a two probe meter reading with one side of the meter on each side of the coil or just verify that live gets to one end of it ? there may be a chain of microswitches in the loop that require the ventilation to be on, or doors open or shut or similar conditions, or a thermal fuse somewhere  and even perhaps a stop button to be released. Do we know what was done to it  since it last worked - such as cleaning or moving or a small fire  ? This may give a clue where to look.

    Mike.

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