Mitsubishi Electric MELSERVO-J4 Instruction Manual Trouble Shooting page 49

1. TROUBLESHOOTING
Alarm No.: 54 Name: Oscillation detection
Alarm content
Detail
Detail name
No.
54.1 Oscillation (1) The servo system is
detection error
(2) The resonance
(3) The encoder or liner
Alarm No.: 56 Name: Forced stop error
Alarm content
Detail
Detail name
No.
56.2 Over speed (1)
during forced
stop
(2) The torque limit has
(3) The servo system is
(4) The encoder or liner
An oscillation of the servo motor was detected.
Cause
Check if the servo
unstable and oscillating. motor is oscillating.
Check the torque
ripple with MR
Configurator2.
Measure the
frequency has changed resonance frequency
due to deterioration. of the equipment and
compare it with the
setting value of the
machine resonance
suppression filter.
Replace the servo
encoder is motor or linear
malfunctioning. encoder, and then
check the
repeatability.
The servo motor does not decelerate normally during forced stop deceleration.
Cause
The forced stop Increase the
deceleration time parameter setting
constant value is short. value, and then check
[A]: [Pr. PC51] the repeatability.
[B] [WB] [RJ010]:
[Pr. PC24]
Check if the limiting
been enabled. torque is in progress.
Check if the servo
unstable and oscillating. motor is oscillating.
Check the torque
ripple with MR
Configurator2.
Replace the servo
encoder is motor or linear
malfunctioning. encoder, and then
check the
repeatability.
Check method Check result
The torque ripple is
vibrating.
The torque ripple is
not vibrating.
The resonance
frequency of the
equipment is different
from the filter setting
value.
The resonance
frequency of the
equipment is the
same as the filter
setting value.
It is not repeatable.
Check method Check result
It is not repeatable.
It is repeatable.
The limiting torque is
in progress.
The limiting torque is
not in progress.
The torque ripple is
vibrating.
The torque ripple is
not vibrating.
It is not repeatable.
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Action Target
Adjust the servo gain [A]
with the auto tuning. [B]
Set the machine [WB]
resonance [RJ010]
suppression filter.
Check (2).
Change the setting
value of the machine
resonance
suppression filter.
Check (3).
Replace the servo
motor or linear
encoder.
Action Target
Adjust the [A]
deceleration time [B]
constant. [WB]
[RJ010]
Check (2).
Review the torque
limit value.
Check (3).
Adjust the servo gain.
Set the machine
resonance
suppression filter.
Check (4).
Replace the servo
motor or linear
encoder.