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Discuss Two Three Phase motors on one Overload in the Commercial Electrical Talk area at ElectrciansForums.co.uk.

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  1. TailSpin
    Offline

    TailSpin EF Member

    Hi All

    I have come across two 3 phase in line WOODS fans rated @ 0.22 kW / 0.6 amps connected together on one overload. This does not seem correct is there anyway this could be right ?

    Regards

    Tailspin :shocked::confused:
     
  2. JD6400
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    JD6400 Trusted Advisor

    Location:
    ?
    Maybe , but ?
     
  3. t-s
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    t-s Regular EF Member

    Location:
    Darlington
    wrong to me, not dangerous just doesn't really protect as it should.
     
  4. Knobhead
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    Knobhead Guest

    Woods dual impeller fans were often connected like that. It’s 20 odd years since I worked on them. If your worried about it change it for one contactor with two O/L units but if it’s a Woods own brand starter, best of luck! They were tight on space at the best of times.

    It’s important that they start and stop together so one contactor with two O/L units is the best way.
     
    Last edited by a moderator: Feb 25, 2012
  5. silva.foxx
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    silva.foxx Electrician's Arms

    Location:
    North Wales


    I don't think motors < 0.37kw require overloads yet this setup offers phase loss/imbalance protection and overload indication.

    What is the overload set to?
     
  6. Knobhead
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    Knobhead Guest

    As memory serves, that’s the basis of the original Woods starters.
    Basically keep it simple.

    The ones I worked on dated from the early 50’s (just older than me before you lot start), the only time they failed was when a kiln backfired and the fan motors got fried.
     
  7. ian.settle1
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    ian.settle1 Trusted Advisor

    Location:
    Wirral
    I would have said it was roasted more than fried:yes::teeth_smile:
     
  8. TailSpin
    Offline

    TailSpin EF Member

    Hi all
    Thanks for your thoughts . Overloads are rated for both to run together I was wondering if any regulations are in place to avoid running more that one motor on one overload ?

    Regards
    John
     
  9. Knobhead
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    Knobhead Guest

    If you are using the original Woods starters then you are going by the manufacturers recommendations.
     
  10. TailSpin
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    TailSpin EF Member

    All of the overloads are Alan West : controlled by
    Enbray contactors .
    This set up is used through out the site for AHU extract and supply fans.
    Regards
    Tailspin
     
  11. Knobhead
    Offline

    Knobhead Guest

    Christ, are you working in a museum?

    How long have these motors been like that? Are they working OK?

    Unless you’re trying drum up business for unnecessary work, leave it alone.
     
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