NSK EDD Megatorque Motor, User Manual, Page: 5 / 398

4. Quick troubleshooting
…
Confirm it one more time.
1) When an alarm occurs

When an alarm occurs right after the power is on, please refer to
4.1. Quick Troubleshooting…Alarm when the power is on .

Did you take proper action to the alarm?
◊
Follow the remedy described in the manual again.
2) When the power does not turn on and the indication display does not turn on

Check the voltage of main and control power by a tester if the voltage is in the range of specifications that are described
in the User’s manual.
3) When the Motor does not move

Turn off the Motor power and check the followings.
Does the Motor turn smoothly?
Is there any jerky motion?
Does the rotation axis have any axial play?
(Never disassemble the Motor.)

Are the control Inputs and Outputs properly functioning?
◊
Monitor the status of SVON and IPOS signals by the I/O command through the Handy Terminal.
◊
Check if the voltage of input signal and 24 VDC power source are stable using an oscilloscope, etc.
4) The Motor vibrates. Positioning is inaccurate. Alarm of software thermal occurs frequently.

Did you tune the servo parameters LO (Load inertia), SG (Servo gain), VG (Velocity loop proportional gain), PG
(Position loop proportional gain), FP (Primary low-pass filter) and NP (Primary notch filter)?
◊
Apply tuning to servo parameters by referring to “5. Tuning.”

Are the fixing bolts of the load and the Motor securely fastened?
◊
Check and fasten them tightly if necessary.

Connect the ground terminal of the Driver Unit to one point grounding. (Refer to the User’s Manual for wiring.)

Is any external force in rotational direction when the Motor is stopping with the Servo lock state? (It leads to the Motor
overheat if external force is applied.)
5) Breaker trip occurs frequently.

When the System recovers from the breaker trip by turning on the power again, take the following action.
◊
Select a breaker of which rated current suits to the power capacity of the Driver Unit.