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    What are remedies for the Supply Mains Overvoltage Fault (OSF) on the Altivar Process Drive?

    Issue:
    What are remedies for the Supply Mains Overvoltage Fault (OSF) on the Altivar Process Drive?

    Product Line:
    Altivar Process Drives (ATV630, ATV930, ATV650, ATV950, ATV660, ATV960, ATV680, ATV980)

    Environment:
    All serial numbers for Altivar 600 and 900 Process Drive

    Cause:
    N/A

    Resolution:
    This fault appears when the nominal voltage exceeds the maximum value of the drive
     
    Possible Remedies:
    • Check Supply Line Voltage
      • Check for Power Factor Correction Capacitors
    • Measure DC Bus Voltage (PA+ and PC-) On an ATV630 these terminals are located behind a black sticker
      • Check for any additional or DC generating device next to the drive
    • If there is an IT system, (High Leg Delta or Corner Grounded), suggest to disconnect the EMI filter and then power cycle the drive and see if the fault returns..
      • Measure each incoming phase to ground to be sure whether you have a high leg. If so, that high leg could be overcharging the EMI filter capacitors, and in turn, overcharging the DC bus


     

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