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    What is a USF fault on ATV61/71

    Issue:
    Drive faulting on USF fault.

    Product Line:
    All drives.

    Environment:
    All.

    Causes:
    Low voltage on drive's DC bus.

    Resolution:
    USF is a mains undervoltage fault that appears when the drive's DC bus goes below a certain value. 
    Check the Mains voltage on L1, L2, and L3 with a true RMS meter. 
    Measure DC voltage on drive's DC bus PA (+) and PC(-) with meter.

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