PowerFlex 525 F033 Auto Rstrt Tries: what to check first?
My PowerFlex 525 drive on a pump application keeps faulting with F033 Auto Rstrt Tries. This happens after it tries to clear some other fault multiple times. What should I check first?
Fault F033 on a PowerFlex 525 drive indicates that the drive attempted to reset a fault and resume operation for the configured number of attempts (A541 [Auto Rstrt Tries]) but failed. This is a Type 2 fault, meaning it cannot be auto-reset. The F033 fault itself is not the root cause; it points to an underlying Type 1 fault that repeatedly tripped the drive.
Likely causes and checks
1A recurring underlying fault
- Points to it
- The drive repeatedly encountered the same Type 1 fault, which it tried to clear and restart from, eventually exhausting the allowed retry attempts.
- Check
- Examine the fault queue (b008, b009, and F604–F610) to identify the specific Type 1 fault that kept recurring. Then, troubleshoot that particular fault.
2Supply problems that outlast the restart delay
- Points to it
- Transient supply issues (like F004 or F005) caused the drive to trip, and the disturbance lasted longer than the configured auto restart delay, preventing successful restarts.
- Check
- If the underlying faults are F004 (UnderVoltage) or F005 (OverVoltage), compare the duration of the supply disturbance with A542 [Auto Rstrt Delay] and address the power supply issue.
3Restart delay too short for the condition to clear
- Points to it
- Conditions like overheating (F008 Heatsink OvrTmp or F007 Motor Overload) persisted because the auto restart delay was insufficient for the drive or motor to cool down before another restart attempt.
- Check
- If the underlying fault is F008 or F007, investigate the cause of the overheating. A longer delay would only mask the underlying problem.
Next check: The most crucial step is to identify the original Type 1 fault that the drive was repeatedly trying to clear. Check the fault queue (b008, b009, and F604–F610) to find this information, then troubleshoot that specific fault.
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