Fan motor wiring

Discussion in 'Electrics UK' started by nickjb, 24 Mar 2021.

  1. nickjb

    nickjb

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    I picked an old fan hoping to use it in the workshop. It'll run and gives decent airflow but it won't start. If I power it then it buzzes, if I give it a little nudge it spins nicely. I wondered if it needed a capacitor but I tried a couple, rather blindly, in a couple of different configurations without much luck. Can anyone suggest a suitable wiring arrangement? There are 4 wires from the motor earth/blue/brown/black. There is a chance it is faulty, too, I suppose.


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  3. bernardgreen

    bernardgreen

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  4. nickjb

    nickjb

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    Yes, funnily enough I've seen that. It doesn't give a suitable value for the capacitor and I couldn't get it to work. Hoping for a more practical answer on here from someone who knows motors, even if that is just proving the motor is kaput
     
    Last edited: 24 Mar 2021
  5. bernardgreen

    bernardgreen

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    The label on the motor says 2uF 450 volt so a 2 micro Farad capacitor would be needed.

    If fitting a 2uF capacitor as shown in the circuit diagram does not make the motor start then the odds are the motor is kaput.
     
  6. conny

    conny

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    As Bernard says.
    If it's a salient pole motor the salient pole could be cracked. Otherwise it may have shorted turns on the start winding and giving it a spin by hand overcomes the start problem.
    Neither problems are a DIY fix.
     
  7. danechip

    danechip

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    Go back to your pic of your wiring then compare that to the PDF. The blue wire of the motor is Live, Black is neutral and a cap in between. Maybe a clear head and start again?

    EDIT: Oops

    Black is neutral, blue is Live according to this PDF:
    Motor leaflet

    Posted 2 months ago
     
    Last edited: 24 Mar 2021
  8. JohnW2

    JohnW2

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    That's rather novel :)

    Kind Regards, John
     
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