AC 230 volt motor won't run, but 120 volt it will

Discussion in 'General Electronics Chat' started by Dustys, Mar 12, 2014.

  1. Dustys

    Thread Starter New Member

    Mar 12, 2014
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    New motor out the box prewired with pig tail won't run on 230 volts, Check wiring on motor a ok. check thermo switch a ok. Check cap uf 800 and check model number on line came back with 120 volt cap. So could this be why it won't run on 230 volts. I put on a jumper and plug it in 120 volts and it ran. Never had one like this before!:eek:
     
  2. MaxHeadRoom

    Expert

    Jul 18, 2013
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    What does it do exactly on 230V? Hum? Nothing?
    Is there a connection diag. in the terminal box?
    Max.
     
  3. Dustys

    Thread Starter New Member

    Mar 12, 2014
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    The motor does nothing on 230 volt
     
  4. Dustys

    Thread Starter New Member

    Mar 12, 2014
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    yes there is a connection diag. I try it CW and CCW and end up on 120 volt setting
     
  5. #12

    Expert

    Nov 30, 2010
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    It must be a 120 volt motor. I'm surprised it didn't just start smoking or explode the capacitor.
     
  6. MaxHeadRoom

    Expert

    Jul 18, 2013
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    Do you have any way of checking the current? Clamp meter on etc.
    In any case the 120v cap is low value even for 120v supply?
    Even if the cap were a problem on 240, the run winding should pass current and be evident by a hum or blow the breaker etc?
    Max.
     
  7. Dustys

    Thread Starter New Member

    Mar 12, 2014
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    When the motor is wired for 230 Volts and put mult meter on it show line open and no amp draw. With 120 volt leads on I do pick up resistance and amp draw is in normal on 120 volts
     
  8. MaxHeadRoom

    Expert

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    Wrong hook up somewhere!
    Check resistance across the line, when wired correctly it should show low resistance.
    Where did you get the 230v diag from?
    Max.
     
  9. inwo

    Well-Known Member

    Nov 7, 2013
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    How exactly have you checked for 230vac available?

    Checked under load?
     
  10. Dustys

    Thread Starter New Member

    Mar 12, 2014
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    Motor came pre wired with pig tail to be install in a controller for a grain elevator. Wire diag where located on the side of motor. I would post them but have not figure out how to do that yet.
     
  11. MaxHeadRoom

    Expert

    Jul 18, 2013
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    I suspect you have a jumper strap missing for 230v?
    Supplier dropped the ball maybe?
    Max.
     
  12. Dustys

    Thread Starter New Member

    Mar 12, 2014
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    Check voltage at control box witch has a 230 coil that control all the safety a-ok and tested pig tail feeds at the motor. There three other motor on the system all setting on 230 volts all working fine, and this one work only on 120 volts.
     
  13. MaxHeadRoom

    Expert

    Jul 18, 2013
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    Possible they sent the wrong motor?
    Max.
     
  14. Dustys

    Thread Starter New Member

    Mar 12, 2014
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    It one of those thing that make you scratch your head and needed to bounce it of someone else!
     
  15. #12

    Expert

    Nov 30, 2010
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    You're back to, "read the diagram, find the error". Especially look for what Max said..a missing jumper.

    Either your motor is running with only one winding carrying the 120V current or it's a mis-wire.
    In 120 mode, 2 coils are in parallel, but they would be in series for 240V.
    If one coil is open, it will stop all the current in 240V mode but one of the windings will still work in 120V mode.
    Measure the ohms of each winding and see it they are all good.
     
  16. Dustys

    Thread Starter New Member

    Mar 12, 2014
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    Thank for the input, new motor on it way for Saturday and let you know!
     
  17. MaxHeadRoom

    Expert

    Jul 18, 2013
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    Strange they sent a motor connected for 230v without testing it?
    Max.
     
  18. #12

    Expert

    Nov 30, 2010
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    or the jumper fell of and it's inside the motor:eek:
     
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