The Machine Vibrates Unsteadily When It Stops; Overshoot/Undershoot Occurs; The Servo Motor Starts Moving Immediately After The Power-On Of The Servo Amplifier Or Servo-On - Mitsubishi Electric MR-JET- G Series User Manual

The machine vibrates unsteadily when it stops

• The machine vibrates unsteadily when it stops.
Possible cause
1.
The servo gain is too low or the response of
the auto tuning is too low.

Overshoot/undershoot occurs

• Overshoot/undershoot occurs.
Possible cause
1.
The servo gain is too low or too high. The
response of auto tuning is too low or too high.
2.
The setting of [Pr. PB06 Load to motor inertia
ratio/load to motor mass ratio] is incorrect.
3.
The maximum torque is insufficient due to the
excessive load or the capacity of the servo
motor is insufficient.
4.
The setting of the torque limit value is too
small.
5.
The backlash of the machine part is too large.
The servo motor starts moving immediately after the power-on of
the servo amplifier or servo-on
• The servo motor starts moving immediately after the power-on of the servo amplifier.
• The servo motor starts moving immediately after servo-on.
Possible cause
1.
When a servo motor with an electromagnetic
brake is used, the brake release timing is
incorrect.
2.
The connection of the servo motor is incorrect.
1 SERVO AMPLIFIER TROUBLESHOOTING
100
1.4 Trouble which does not trigger an alarm/warning
Check/action method
Increase the servo gain or the value of [Pr. PA09 Auto tuning response].
Check/action method
Adjust the response of auto tuning and readjust the gain.
Check if the setting value of [Pr. PB06] matches the actual load moment of
inertia or load mass. If the value does not match, set the parameter correctly.
Check the instantaneous torque on the status display. Check if the torque
reaches the torque limit value. Keep the torque outside the torque limit value
by increasing the acceleration/deceleration time or by reducing the load.
Alternatively, use a servo motor with a larger capacity.
Check the instantaneous torque on the status display. Check if the torque
reaches the torque limit value.
Increase the torque limit value so that the torque does not reach the limit
value.
Perform an inspection and maintenance of the coupling and the machine.
Check/action method
Review the timing of the electromagnetic brake release.
Check the U/V/W wiring.
Refer to "Example power circuit connections" in the following manual.
MR-JET User's Manual (Hardware)
Model
[JET-G]
Model
[JET-G]
Model
[JET-G]