The Servo Motor Vibrates With Low Frequency; An Unusual Noise Is Occurring In The Servo Motor - Mitsubishi Electric Melservo-J5 MR-J5 Series User Manual

Possible cause
5.
In the speed control mode and the torque
control mode, the selection of SP1 (Speed
selection 1), SP2 (Speed selection 2), or SP3
(Speed selection 3) is incorrect.
6.
In the speed control mode and the torque
control mode, the analog signal is incorrectly
inputted.

The servo motor vibrates with low frequency

• The servo motor vibrates with low frequency
Possible cause
1.
The estimated value of the load to motor
inertia ratio by auto tuning is incorrect. When
the load to motor inertia ratio is set by manual,
the setting value is incorrect.
2.
The command from the controller is unstable.
3.
When the servo motor stops, torque or thrust
at acceleration/deceleration overshoots,
exceeding the limit of the servo motor.
4.
The servo gain is low. Or the response of the
auto tuning is low.

An unusual noise is occurring in the servo motor

• An unusual noise is occurring in the servo motor.
Possible cause
1.
The servo gain is high. Or the response of the
auto tuning is high.
2.
The bearing has reached its life.
3.
For a servo motor with an electromagnetic
brake, the brake has not been released.
4.
When a servo motor with an electromagnetic
brake is used, the brake release timing is
incorrect.
Check/action method
Review the settings of SP1, SP2, SP3, and setting of internal speed.
Check the values of the analog speed command and the analog torque
command on the status display or on MR Configurator2.
Check/action method
Execute the auto tuning or one-touch tuning to set the load to motor inertia
ratio again. When setting manually, set the load to motor inertia ratio correctly.
Refer to the following manual.
MR-J5 User's Manual (Adjustment)
Review the command from the controller.
Check for disconnection or other failure in the Ethernet cable.
If the torque at acceleration/deceleration reaches the maximum torque, reduce
the generated torque by increasing the acceleration/deceleration time,
reducing the load, or other measures.
Increase the servo gain. Or, increase the value of [Pr. PA09 Auto tuning
response].
Check/action method
Increase the servo gain. Or, increase the value of [Pr. PA09 Auto tuning
response].
If the servo motor can be operated safely, remove the load and check for a
noise in the servo motor itself.
If the servo motor is removable from the machine, remove the servo motor
power cable, then release the brake, and rotate the servo motor by an external
force to check for a noise. If a noise occurs, the bearing is at the end of its life.
Replace the servo motor. If no noise occurs, perform maintenance on the load
side.
Turn on the electromagnetic brake power.
Review the timing of the electromagnetic brake release.
Take into account that the electromagnetic brake has release delay time.
1 SERVO AMPLIFIER TROUBLESHOOTING
1.4 Trouble which does not trigger an alarm/warning
Model
[A]
1
Model
[A]
[G]
[WG]
Model
[A]
[G]
[WG]
103