Mitsubishi Electric MELSERVO MR-J4-B-RJ Series, Instruction Manual

Page: 67 / 174

1. TROUBLESHOOTING FOR SERVO AMPLIFIER (DRIVE UNIT)
1 - 60
Alarm No.: 52 Name: Error excessive
Alarm content Droop pulses have exceeded the alarm occurrence level.
Detail
No.
Detail name Cause Check method Check result Action Target
52.1 Excess droop
pulse 1
(12) Servo motor shaft was
rotated by external
force./ The moving part
of the linear servo motor
was moved by external
force.
Measure the actual
position under the
servo-lock status. It is rotated by
external force./ It
was moved by
external force. Review the machine. [A]
[B]
[WB]
[RJ010]
[GF]
It is not rotated by
external force./ It
was not moved by
external force. Check (13).
(13) The encoder or the
servo motor is
malfunctioning.
Replace the servo
motor, and then check
the repeatability. It is not repeatable. Replace the servo
motor.
It is repeatable. Check (14).
(14) The servo amplifier is
malfunctioning.
Replace the servo
amplifier, and then
check the
repeatability. It is not repeatable. Replace the servo
amplifier.
52.3 Excess droop
pulse 2
Check it with the check method for [AL. 52.1].
52.4 Error excessive
during 0 torque
limit
(1) The torque limit has
been 0.
Check the torque limit
value. The torque limit has
been 0. Do not input a
command while the
torque limit value is
0. [A]
[B]
[WB]
[RJ010]
[GF]
52.5 Excess droop
pulse 3
Check it with the check method for [AL. 52.1].
Alarm No.: 54 Name: Oscillation detection
Alarm content An oscillation of the servo motor was detected.
Detail
No.
Detail name Cause Check method Check result Action Target
54.1 Oscillation
detection error
(1) The servo system is
unstable and oscillating.
Check if the servo
motor is oscillating.
Check the torque
ripple with MR
Configurator2. The torque ripple is
vibrating. Adjust the servo gain
with the auto tuning.
Set the machine
resonance
suppression filter. [A]
[B]
[WB]
[RJ010]
[GF]
The torque ripple is
not vibrating. Check (2).
(2) The resonance
frequency has changed
due to deterioration.
Measure the
resonance frequency
of the equipment and
compare it with the
setting value of the
machine resonance
suppression filter. The resonance
frequency of the
equipment is
different from the
filter setting value. Change the setting
value of the
machine resonance
suppression filter.
The resonance
frequency of the
equipment is the
same as the filter
setting value.
Check (3).
(3) The encoder or linear
encoder is
malfunctioning.
Replace the servo
motor or linear
encoder, and then
check the
repeatability. It is not repeatable. Replace the servo
motor or linear
encoder.