Rockwell Automation 1391 USER MNL/DIGITAL AC SERVO DR - Manual (Page 103)

Chapter 11
Troubleshooting
11-9
Table 11.D
General Servomotor Troubleshooting
Possible Cause
1. The motor connections are loose or open.
2. Foreign matter is lodged in the motor.
3. The motor load is excessive.
4. The bearings are worn.
5. The motor brake is engaged (if supplied).
1. The rotor is partially demagnetized causing excessive motor current.
2. Motor voltage is exceeding the maximum value.
3. The duty cycle is excessive.
1. Loose parts are present in the motor.
2. Through bolts are loose.
3. The bearings are worn.
4. Parameters 168, 169 and 170 are set too high.
1. Phases A & B, A & C or B & C reversed
2. Sine, Cosine or Rotor leads reversed
3. Sine, Cosine, Rotor lead sets reversed
4. Combinations of 1, 2, 3
Condition
No Rotation
Overheating
Abnormal Noise
Erratic Operation - Motor locks into
position, runs without control or with
reduced torque