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    What could be causing the motor coupling between my motor and compressor to break when the motor is powered with a VFD?

    Issue:
    What could be causing the motor coupling between my motor and compressor to break when the motor is powered with a VFD?

    Product Line:
    All VFD product lines

    Environment:
    All models, All serial numbers

    Cause:
    Motor coupling is breaking when powered by VFD.  Did not do this when connected to line power.

    Resolution:
    Check the motor control type (CTT parameter on most drives).  If this is in a sensorless flux vector or flux vector control mode, try changing to "v/f 2pts." mode or Standard mode.  These modes do not try to automatically adjust motor voltage to maintain torque.  

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