Rockwell Automation 1333 Drive, 3/4-5HP, 230-575V Series D - Manual (Page 117)

Preventive Maintenance and
Troubleshooting Common Drive Problems
Appendix B
B-10
2. The motor will not run continuously --
OC
is displayed.
Does a short circuit exist in the output leads or motor windings? Remove the cause of the short circuit.
Yes
Does a ground fault exist between the drive output leads and the motor or in
the motor windings?
No
Remove the cause of the ground fault.
Is the application a fan or pump system? Does the drive trip when the speed reference is below 5.0Hz?
Is the acceleration time too short? Is Parameter 17, Accel Frequency Hold
off?
Is the load within the rated current of the drive?
No
No
No
Yes
Yes
Yes
No
Reduce the boost setting
in Parameter 5.
Yes
Change the V/Hz ramp to
variable by setting
Parameter 4 to 1, then
reduce the boost level
setting in Parameter 5 if
required.
Increase the value of Accel Time 1 Parameter 1, or set Parameter 17 Accel
Frequency Hold on.
No
Program Parameter 46 Current Limit to eliminate nuisance tripping, lighten
the load, or resize the drive and motor to meet your application.
Is OC displayed even if the drive output leads are disconnected?
No
Verify motor operation by line operating the motor or repeating the above. Is
the motor now operating correctly?
No
Contact your nearest AĆB representative for application assistance.
Yes
Yes
Yes