Help needed on single phase pump.

Discussion in 'General Electronics Chat' started by KAKTUS, Oct 23, 2011.

  1. KAKTUS

    Thread Starter New Member

    Jul 3, 2008
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    0
    [​IMG]
    I have been given a small single phase 3 speed Grunfos circulating pump that will be ideal for our outside pond if I can get it working.

    It apparently got moisture into it's terminal block and had a catastrophic flash over which frazzled the connections and blew off the terminal cover.

    The above mudmap is what is shown when I checked it with a multi meter, None of the internal coils seem to be down to earth.

    Also a 5uf 400v capacitor came with it.

    Anyone have any idea how it should be connected to the capacitor and mains to run at maximum speed?

    Any help will be appreciated.
     
  2. PackratKing

    Well-Known Member

    Jul 13, 2008
    850
    215
    Before you go much further, considering its history, I would run a Hi-Pot test on the coils - to - shell / ground. Any pix available of what is left of the terminal block, since you appear to have two unused coils there.
     
  3. KAKTUS

    Thread Starter New Member

    Jul 3, 2008
    5
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    Thanks for your response PackratKing, Coil insulation above ground is OK.
    I will try to post a photo of the terminal block if you think it will help.
    All coils are available for use as the pump was a 3 speed motor, I only want to connect the appropriate coil and capacitor for the fastest speed.
    How the 5uf 400v capacitor fits into the circuit is the main thing I think.
     
  4. KAKTUS

    Thread Starter New Member

    Jul 3, 2008
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    I can't find the terminal block which shouldn't be a problem as the mud map shows the 3 individual coils and their impedances.
    It should be straight foreward for someone with the knowledge on how this type of single phase motor is internally wired.
     
  5. KAKTUS

    Thread Starter New Member

    Jul 3, 2008
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    Judging from the responses to this query the internal connections must be more complicated than I thought!
     
  6. Teri

    Member

    Apr 3, 2009
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    Just a guess based on past experience. One of these should work and the other one won't. The second figure is most likely. If the pump runs backwards, reverse the wires to terminals one and two. GL, Teri
     
  7. KAKTUS

    Thread Starter New Member

    Jul 3, 2008
    5
    0
    Thanks Teri, I'll give it a try, The worst thing that can happen is It'll blow a circuit breaker.
     
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