Troubleshooting – Rockwell Automation 21G PowerFlex 750-Series AC Drives Programming Manual User Manual
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Rockwell Automation Publication 750-PM001J-EN-P - October 2014
Appendix B
Application Notes
Troubleshooting
The following faults commonly occur during drive commissioning.
F4 “Undervoltage”
•
If the mains supply is still present, reduce the undervoltage level at P461
[UnderVltg Level].
F5 “Overvoltage”
•
Monitor the DC Bus voltage while operating the crane. When lowering
the load, limit the DC bus voltage to 750V DC.
•
Verify that the external resistor is correctly connected / wired
•
Verify that the parameter settings as stated in Point 1.
•
Monitor bit 20 DB active of P935 [Drive Status 1]. This bit comes on
when dynamic braking is active.
F20 “TrqProve Spd Band” (Speed deviation fault)
•
This fault is only active when TorqProve is enabled.
•
Speed loop tuning not correct. Increase P636 [Speed Reg BW] or P76
[Total Inertia]. If values are too high, the regulator becomes unstable.
•
Verify P3 [Mtr Vel Fdbk] follows P594 [Ramped Spd Ref ] as best as
possible.
•
Drive is going into current limit. Drive is undersized or acceleration /
deceleration are set too fast.
•
Brake is not opening. Check for faulty brake rectifier.
For more fault information, see
.