NSK Megatorque PS Series, User Manual, Page: 343 / 370

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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
4) Mechanical resonance.
•
Refer to “5. Tuning” for adequate tuning.
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 4: Procedure
for Replacing the EDC Driver Unit.”
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 4: Procedure
for Replacing the EDC Driver Unit.”