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  • Electric motor issue

    I'm having a motor issue. I will try to give all the info possible.
    motor:
    3 hp
    208 - 230 V
    three "butt" connectors at the motor (red, black and blue)
    https://www.automationdirect.com/adc...f,_footed/j053

    vfd:
    3 hp
    208 - 230 V
    https://www.valinonline.com/products/esv222n02yxb

    It's starting up for 3-4 seconds and right after that it trips the 30 amp breaker. It's on its own circuit (alone) with 10-2 nmd90 wire (90 feet long) with a 30 amp breaker.

    Any idea what it could be?



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  • #2
    The vfd should never draw more than 15A. Fact that it trips a 30A breaker and still powers up again, says the breaker is damaged. Do you have anything else on the 30A circuit than this mottor? Why would you have 30A protection on a less than 15A load?

    fact that vfd powers up with no fault says vfd could still be ok. If the motor was shot, the vfd would fault. So I guess your best chance is to replace the breaker and hope everything returns to normal.

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    • #3
      Did you verify that all parameters in the VFD are set for that motor?

      Is the circuit breaker one that is in a subpanel? Or did you install the breaker in a control cabinet somewhere? If it is a control cabinet breaker, did you verify the trip curve? Shouldnt really matter sine the drive should never draw anywhere close to 30A, but still a consideration.

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      • #4
        Sounds like it could be a bad breaker. That looks like the proper current rating for that size drive. Double check the motor and drive wiring as well and make sure things are grounded properly.

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        • #5
          10-2 wire means single phase in. When you have single phase in and 3 phase out you need to oversize the drive. the drive also has to be the kind that can accept single phase in and 3 phase out, not sure if all drives can do that. Also do not use nmd90 wire from drive to motor.

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          • #6
            Originally posted by Levi G View Post
            10-2 wire means single phase in. When you have single phase in and 3 phase out you need to oversize the drive. the drive also has to be the kind that can accept single phase in and 3 phase out, not sure if all drives can do that. Also do not use nmd90 wire from drive to motor.
            That drive is single or three phase and rated for 3HP on single phase in.

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