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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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  • 0

    Oh god yes, forgot to look for actual earthing,  if that is a plastic box there ought to be some pirahna nuts or banjoz on those SWA glands and some bits of Green and yellow that really are at earth potential, not seeing any of that  ....

    When you go again,  take your reels of brown and blue and green yellow tape and some earth wire,  and at the least make it a bit clearer to any newcomer  what that green and yellow actuator signal actually is and if those heavy blacks are earth, then they should also be indicated, and if practical  bonded to the armour glands .

    It is possible, but a bit naughty, to take the old style banjo lugs that still come with some makes of SWA Gland, and cut a small break in the loop, to make a sort of 3/4 circular  fork, that can be retrospectively added on an existing system by loosening the gland and its nuts and bending pushing it under and then flattening it again so it is trapped and flattened as you re-tighten the nuts. Not as good as a pirahna, but a lot better than fresh ait and probably as good as the old flat banjo at least where not too much shock and vibration is expected.

    Mike.

  • 0 in reply to mapj1

    Thanks Mike, I’ll definitely try and make the cable more identifiable when I next visit and great tip about adapting the banjo. Much appreciated. 

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  • 0 in reply to mapj1

    Thanks Mike, I’ll definitely try and make the cable more identifiable when I next visit and great tip about adapting the banjo. Much appreciated. 

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