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    What is an USF fault on the ATV28 drive?

    Issue:
    What is an USF fault on the ATV28 drive?

    Product Line:
    Altivar ATV28

    Environment:
    All

    Cause:
    Mains undervoltage is to low on L1 L2 L3.

    Resolution:
    USF is an undervoltage fault. 
    Check the Mains voltage on L1 L2 L3 with a digital meter.
    Check the DC bus voltage on PA and PC

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