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    Video: What causes an LFF3 fault code on the ATV320 drive?

    Issue:
    What causes an LFF3 fault code on the ATV320 drive?

    Product Line:
    Altivar 320, ATV320

    Environment:
    All Models

    Cause:
    Troubleshooting an LFF3 fault code

    Resolution:
    This fault indicates that the 4-20mA reference on Ai3 and COM is not being seen as expected.
    If this function is programmed in error, you can disable it by going to CONF->FULL->I/O. 
    Here you will have menus A1C-, A2C-, and A3C-.  These are alarm group 1 - 3 definition parameters.
    One of them must be programmed as AP3 as AP3 is an alarm indicating the absence of 4-20mA signal on input AI3.
    These can always be unassigned to disable this function if not needed.

     

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