Mitsubishi Electric Melservo-J3 Series MR-J3-B, Instruction Manual

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11 - 22
11. TROUBLESHOOTING
Description Check method Possible cause Action
An unusual noise
is occurring at the
servo motor 1. If the servo motor can be driven
safely, repeat acceleration and
deceleration three times or
more to complete auto tuning.
2. Reduce the auto tuning
response. (Parameter
No.PA09). (Except for the
manual mode)
1. The servo gain is high.
2. The auto tuning response is high. Reduce the auto tuning response, and
readjust the gain. (Refer to chapter 9.)
If the servo motor can be driven
safely, remove the load, and
check for a noise only on the
servo motor. If there is noise, the bearing is at the end
of its life. Change the servo motor.
The backlash of the machine part is
increasing if there is no unusual noise. Maintain the machine.
For a servo motor with an
electromagnetic brake, check the
dragging of the brake. 1. The sequence of releasing the
electromagnetic brake is incorrect.
2. The power supply for the
electromagnetic brake is
malfunctioning.
1. Review the sequence of releasing
the electromagnetic brake.
2. Check the power supply for the
electromagnetic brake.
The brake rattles when using a
servo motor with an
electromagnetic brake. The noise is due to a gap between the
connections of brake, not a fault.