Mitsubishi Electric MELSERVO-J3 Series Instruction Manual page 379

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