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 Melservo-J5 MR-J5 Series User Manual

The machine vibrates unsteadily when it stops

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

Overshoot/undershoot occurs

• Overshoot/undershoot occurs.
Possible cause
1.
The servo gain is low, or high. The response of
auto tuning is low, or high.
2.
The setting of [Pr. PB06 Load to motor inertia
ratio/load to motor mass ratio] is incorrect.
3.
The capacity of the servo motor is insufficient,
or the maximum torque is insufficient due to
the excessive load.
4.
The setting of the torque limit value is small.
5.
The backlash of the machine part is 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.
The SON (Servo-on) is already turned on at
power-on.
2.
ST1 (Forward rotation start) or ST2 (Reverse
rotation start) is inputted already at the start.
3.
An analog signal is already inputted at the
start.
4.
The zero point of an analog signal deviates.
5.
When a servo motor with an electromagnetic
brake is used, the brake release timing is
incorrect.
6.
The connection of the servo motor is incorrect.
Check/action method
Increase the servo gain. Or, increase 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. Or
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 wiring or the sequence program.
Review the wiring or the sequence program.
Review the timing of inputting analog signals.
If the servo motor rotates with 0 V inputted for the analog signal, execute the
VC automatic offset, or adjust the offset of the analog signal with [Pr. PC37
Analog command input 1 offset] or [Pr. PC38 Analog command input 2 offset].
Review the timing of the electromagnetic brake release.
Check the U/V/W wiring.
Refer to "Connection example of power supply circuit" in the following manual.
MR-J5 User's Manual (Hardware)
1 SERVO AMPLIFIER TROUBLESHOOTING
1.4 Trouble which does not trigger an alarm/warning
1
Model
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[WG]
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