AB Quality Allen-Bradley 1394 User Manual page 181

Condition:
No Rotation
Overheating
Abnormal Noise
Erratic Operation - Motor
locks into position, runs
without control or with
reduced torque
Possible cause:
The motor connections are loose or open.
Foreign matter is lodged in the motor.
The motor load is excessive.
The bearings are worn.
The motor brake is engaged (if supplied).
The motor is not connect to the load.
The duty cycle is excessive.
The rotor is partially demagnetized causing excessive
motor current.
[Prop Gain Kp, Intg Gain Ki, Feed Fwd Gain] parameters
(368, 372, 376 (Analog Servo only)) are set too high.
Loose parts are present in the motor.
Through bolts are loose.
The bearings are worn.
Phases A and B, A and C or B and C reversed.
Sine, Cosine or Rotor leads are reversed in the feedback
cable connector.
Sine, Cosine, Rotor lead sets of resolver feedback are
reversed.
Troubleshooting
Possible resolution:
Check motor wiring and
connections.
Remove foreign matter.
Size the servo system.
Return the motor for repair.
• Check brake wiring and
function.
• Return the motor for repair.
Check coupling.
Change the command profile to
reduce accel/decel or increase
time.
Return the motor for repair.
Run auto tune again.
• Remove the loose parts.
• Return motor for repair.
• Replace motor.
Tighten bolts.
Return motor for repair.
Check and correct motor power
wiring.
Check and correct motor feedback
wiring.
Check and correct motor feedback
wiring.
Publication 1394-5.0 — May 2000
9-15