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Two Three Phase motors on one Overload

Discuss Two Three Phase motors on one Overload at Electricians Forums; 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 ...
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    Exclamation Two Three Phase motors on one Overload

    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

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    Default Re: Two Three Phase motors on one Overload

    Maybe , but ?

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    Default Re: Two Three Phase motors on one Overload

    wrong to me, not dangerous just doesn't really protect as it should.

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    Default Re: Two Three Phase motors on one Overload

    Woods dual impeller fans were often connected like that. Itís 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 itís a Woods own brand starter, best of luck! They were tight on space at the best of times.

    Itís important that they start and stop together so one contactor with two O/L units is the best way.
    Last edited by Guest5000; 25-02-2012 at 11:57 PM.

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    Default Re: Two Three Phase motors on one Overload

    Quote Originally Posted by TailSpin View Post
    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


    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?
    I saw a loaf of bread with MY name on... then realised it said Thick Cut!

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    Default Re: Two Three Phase motors on one Overload

    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.

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    Default Re: Two Three Phase motors on one Overload

    Quote Originally Posted by Tony View Post
    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.
    I would have said it was roasted more than fried

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    Default Re: Two Three Phase motors on one Overload

    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

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    Default Re: Two Three Phase motors on one Overload

    If you are using the original Woods starters then you are going by the manufacturers recommendations.

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    Default Re: Two Three Phase motors on one Overload

    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

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    Default Re: Two Three Phase motors on one Overload

    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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