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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 Forum Mentor

    Location:
    ?
    Maybe , but ?
     
  3. t-s
    Offline

    t-s Regular EF Member

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

    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
    Offline

    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
    Offline

    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 Forum Mentor

    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
    Offline

    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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