NSK EDD Megatorque Motor - Vibration, Abnormal Noise or Unstable Settling; Improper Positioning

12. Troubleshooting
— 12-3 —
12.2.3. Vibration, Abnormal Noise or Unstable Settling
Table 12-5: Troubleshooting for vibration, abnormal noise and unstable settling
Cause
Remedy
1)
Wrong combination of Motor and Drive
Unit.
 Check if the combination of the Motor and the Driver Unit is correct.
2)
Loose mounting of the fixture and/or the
Motor
 Check for loose mounting of the fixture and the Motor.
3)
Poor setting of the servo gains
 Refer to “5. Tuning” for adequate tuning.
4)
Mechanical resonance.
5)
Low rigidity of the total mechanical
system.
 Refer to “5. Tuning” for adequate tuning.
 If the problem remains, review the rigidity of the total mechanism.
6)
Overload or interference with the
mechanical system of the equipment.
 Remove the external interference.
7)
Defective Cable, Motor, and/or Driver
Unit.
 Refer to “Appendix 2: How to Check Motor Condition” and check the
cable and the Motor.
 If no failure is found in the Cable and the Motor, the Driver Unit may be
defective. Replace it referring to “Appendix 5: Procedure for Replacing
Driver Unit Model EDD.”
12.2.4. Improper Positioning
Table 12-6: Troubleshooting for improper positioning
Cause
Remedy
1)
Wrong combination of Motor and Driver
Unit.
 Check if the combination of the Motor and the Driver Unit is correct.
2)
An alarm or a warning is occurring.
 Identify the alarm or the warning.
3)
Loose mounting of the fixture and/or the
Motor.
 Check for loose mounting of the fixture and the Motor.
4)
Poor setting of the servo gains. .
 The positioning accuracy is poor even the IPOS signal is closed.
 Review the tuning state of the servo related gains.
5)
Overload and/or an excessive friction
load to the Motor due to the mechanical
interference with the surrounding
mechanism.
 Remove the external interference.
6)
External noise interferes in the pulse
train command signal.
 Take measures against the external noise.
7)
An objective program channel is not
selected in the program operation
 Use the monitor IO0 (Input/output monitor 0) to confirm if the objective
channel is selected.
8)
Defective Cable, Motor and/or Driver
Unit.
 Refer to “Appendix 2: How to Check Motor Condition” and check the
cable and the Motor. Replace them if necessary.
 If no failure is found in the Cable and the Motor, the Driver Unit may be
defective. Replace it referring to “Appendix 5: Procedure for Replacing
Driver Unit Model EDD.”