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    What does OCA fault mean on the ATV21 and ATV212 drives?

    Issue:
    What does the OCA fault mean on the ATV21 or ATV212 drives?

    Product line:
    Altivar 212, ATV212, S-Flex

    Environment:
    All models, all serial numbers.

    Cause:
    Overcurrent during start-up or ground fault

    Resolution:
    Disconnect the motor leads from the drive.  Using a 1000V Megger, check the motor and motor leads for shorts or ground fault.

    Try a voltage balance test.  With the motor leads still disconnected, set parameter F605 to 0 (disable Output Phase Failure).  Run the drive at 20Hz, 40Hz and 60Hz.  At each speed measure the line to line output voltages to see if they are balanced.

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