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    What is the PHbd fault on the ATS22 soft starter?

    Issue:
    What is the PHbd fault on the ATS22 soft starter?

    Product Line:
    Altistart ATS22

    Environment:
    All

    Cause:
    PHbd is a phase unbalance fault.

    Resolution:
    The ATS22 monitors the current through each phase. The ATS22 faults PHbd when the current unbalance exceeds the unbalance threhold and time delay.  Unbalance is calculated (Imax - Imin) / Imax.   Troubleshooting steps:

    1. Check line voltage (phase-phase).  An unbalanced voltage results in unbalanced current.
     
    2. In the PRO Menu, check the following parameters:
    Ubd – Unbalance threshold.  A larger value is more tolerant of current unbalance. This setting can be set to OFF, disabling the feature.
    Ubt – Unbalance time delay.  Time that the imbalance needs to be maintained before the ATS22 wiil trip.
     
    3.  With Ubd = OFF, run the motor and check the current draw on each phase.  If the current is not balanced and the voltage is balanced, problem is related to the motor. If both are balanced, then the problem could be related to the soft start.

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