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    What is the fault code PRA on ATV61 or ATV71 drives?

    What is the fault code PRA on ATV61 or ATV71 drives? 

    Product Line:
    Altivar ATV61 ATV71


    Drive status is showing PRA on the HMI display.

    PRA is not a fault code.  It is a state of the drive.  It means that power removal function is active. The drive is not detecting 24Vdc on the PWR terminal.
    Measure for 24Vdc between +24 to COM to verify the internal power supply. If you don't have 24Vdc present on the +24 terminal, measure DC voltage between PA+ and PC- to check your DC bus voltage.
    Confirm that the factory installed jumper between +24 and PWR is solidly connected.  The jumper is removed if a safety circuit is installed.  Verify continuity of the safety circuit.

    When the voltage on PWR is re-established, the drive status will return to RDY if there is not an active run command, or NST if a run command is active.  To clear NST, remove the run command.

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