Rockwell-automation 21G PowerFlex 750-Series AC Drives Programming Man Manual de usuario Pagina 454

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454 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 Chapter 6
.
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