Mitsubishi Electric MELSERVO-JE MR-JE-100A, Instruction Manual

Page: 241 / 310

8. TROUBLESHOOTING
8 - 20
Alarm No.: 52 Name: Error excessive
Alarm content Droop pulses have exceeded the alarm occurrence level.
Display Detail name Cause Check method Check result Action
52.1 Excess droop
pulse 1
(1) The servo motor power
cable was disconnected.
Check the servo motor
power cable. It is disconnected. Repair or replace the
servo motor power
cable.
It is not disconnected. Check (2).
(2) It is incorrect. Connect it correctly. The connection of the
servo motor is incorrect. Check the wiring of U, V,
and W.
It is correct. Check (3).
(3) It is incorrect. Connect it correctly. The connection of the
encoder cable is
incorrect. Check if the encoder
cable is connected
correctly.
It is correct. Check (4).
(4) The torque limit has
been enabled.
The limiting torque is in
progress. Increase the torque limit
value. Check if the limiting
torque is in progress.
The limiting torque is not
in progress. Check (5).
(5) Check if it collided. It collided. Check operation pattern. A moving part collided
against the machine.
It did not collide. Check (6).
(6) The torque is insufficient. Check the peak load
ratio.
The torque is saturated. Reduce the load or
review the operation
pattern. Or use a larger
capacity motor.
The torque is not
saturated. Check (7).
(7) Power supply voltage
dropped.
Check the bus voltage
value. The bus voltage is low. Check the power supply
voltage and power
supply capacity.
The bus voltage is high. Check (8).
(8) Acceleration/deceleration
time constant is too
short.
Set a longer deceleration
time constant, and then
check the repeatability. It is not repeatable. Increase the
acceleration/deceleration
time constant.
It is repeatable. Check (9).
(9) The position loop gain is
small.
It is not repeatable. Increase the position
loop gain ([Pr. PB08]). Increase the position
loop gain, and then
check the repeatability.
It is repeatable. Check (10).
(10) It is rotated by external
force. Review the machine. Servo motor shaft was
rotated by external force. Measure the actual
position under the servo-
lock status.
It is not rotated by
external force. Check (11).
(11) An encoder is
malfunctioning.
Replace the servo motor,
and then check the
repeatability. It is not repeatable. Replace the servo motor.
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.
52.5 Excess droop
pulse 3
Check it with the check method for [AL. 52.1].