Rockwell Automation 23P PowerFlex Digital DC Drive - Manual (Page 300)

300 Rockwell Automation Publication 20P-UM001K-EN-P - July 2014
Appendix C Application Notes
Troubleshooting Crane Setup - Encoderless
The following faults commonly occur during drive commissioning.
F4 “AC Undervoltage”
• If the mains supply is still present, reduce the undervoltage level at P481
[UnderVolt Thresh].
F5 “Arm Overvoltage”
• Verify the parameter settings as stated in Set Up the Drive on page 297 .
F94 “TrqProve Spd Band” (Speed deviation fault)
• This fault is active only when TorqProve is enabled.
• The speed loop tuning is not correct. Increase P434 [Spd Reg BW] or P43
[Total Inertia]. If theses values are too high the regulator will become
unstable.
• P1008 [Spd Reg Fdbk] should follow P113 [Ramp Out] as closely as
possible.
• The drive is going into current limit. The drive is undersized or
acceleration / deceleration is set too fast.
• The brake is not opening. Check for faulty brake operation.
For more fault information, refer to Chapter 4 Troubleshooting, starting on page
215 .