Mitsubishi Electric Melservo-J4 Instruction Manual page 72

Alarm No.: 52
Alarm content
Detail Detail name
No.
52.1 Excess droop
pulse 1
52.3 Excess droop
pulse 2
52.4 Error excessive
during 0 torque
limit
52.5 Excess droop
pulse 3
52.6 Excess droop
pulse during
servo-off
1 TROUBLESHOOTING FOR SERVO AMPLIFIER (DRIVE UNIT)
70
1.4 Remedies for alarms
Name: Error excessive
 Droop pulses have exceeded the alarm occurrence level.
Cause Check method
(13) Servo-on was enabled Measure the actual
while the servo motor position at servo-on.
was rotating.
Servo-on is performed
while the linear servo
motor is moving.
(14) The encoder or the Replace the servo motor,
servo motor is and then check the
malfunctioning. repeatability.
(15) The servo amplifier is Replace the servo
malfunctioning. amplifier, and then check
the repeatability.
Check it with the check method for [AL. 52.1].
(1) The torque limit has Check the torque limit
been 0. value.
Check it with the check method for [AL. 52.1].
(1) Servo motor shaft was Measure the actual
rotated by external position at servo-off.
force.
The moving part of the
linear servo motor was
moved by external
force.
(2) Servo-on was enabled Measure the actual
while the servo motor position at servo-on.
was rotating.
Servo-on is performed
while the linear servo
motor is moving.
(3) The controller is Replace the controller,
malfunctioning. and then check the
repeatability.
(4) The encoder or the Replace the servo motor,
servo motor is and then check the
malfunctioning. repeatability.
(5) The servo amplifier is Replace the servo
malfunctioning. amplifier, and then check
the repeatability.
Check result Action
Servo is enabled while Review the timing of the
the servo motor is servo-on.
rotating.
Servo-on is enabled
while the linear servo
motor is moving.
Servo-on is not enabled Check (14).
while the servo motor is
rotating.
Servo-on is not enabled
while the linear servo
motor is moving.
It is not repeatable. Replace the servo motor.
It is repeatable. Check (15).
It is not repeatable. Replace the servo
amplifier.
The torque limit has been Do not input a command
0. while the torque limit
value is 0.
It is rotated by external Review the machine.
force.
It was moved by external
force.
It is not rotated by Check (2).
external force.
It was not moved by
external force.
Servo is enabled while Review the timing of the
the servo motor is servo-on.
rotating.
Servo-on is enabled
while the linear servo
motor is moving.
Servo-on is not enabled Check (3).
while the servo motor is
rotating.
Servo-on is not enabled
while the linear servo
motor is moving.
It is not repeatable. Replace the controller.
It is repeatable. Check (4).
It is not repeatable. Replace the servo motor.
It is repeatable. Check (5).
It is not repeatable. Replace the servo
amplifier.
Target
[A]
[B]
[WB]
[RJ010]
[GF]
[A]
[B]
[WB]
[RJ010]
[GF]
[B]
[WB]