AB Quality Allen-Bradley 1394, User Manual

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