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

Published date: 13 August 2019

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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