Mitsubishi Electric MELSERVO-J3 Series Instruction Manual page 381

11. TROUBLESHOOTING
Description
The rotation 1. If the servo motor can be driven
accuracy is low. safely, repeat acceleration and
(The rotation deceleration three times or
speed is more to complete auto tuning.
instable.) 2. Increase the auto tuning
response. (Parameter
No.PA09). (Except for the
manual mode)
Check if limiting torque (TLC) is
on .
1. Check with the external I/O
signal display in the diagnostic
mode.
2. Check with "Input/output I/F
Display" command of "Monitor"
menu on MR Configurator.
Check if the maximum torque
exceeds the torque limit value.
1. Check the "instantaneous
torque" in the status display.
2. Check the torque ripple with
"Graph" command of "Monitor"
menu on MR Configurator .
Unsteady 1. If the servo motor can be driven
vibration at a safely, repeat acceleration and
stop. deceleration three times or
more to complete auto tuning.
2. Increase auto tuning response
(Parameter No.PA09). (Except
for the manual mode)
The servo motor Check if servo-on is on.
starts rotating
For a servo motor with an
upon the power-
electromagnetic brake,
on of the servo
check the timing of releasing the
amplifier/the
electromagnetic brake.
servo motor
starts rotating
Check the servo motor power
upon servo-on.
cable.
The position A fixed amount (in one revolution)
deviates at the deviates. (Dog type home position
home position return)
return.
Check the in-position range
(Parameter No.PA10).
Check if the proximity dog signal
is inputted correctly.
Check method
1. The servo gain is low.
2. The auto tuning response is low.
An unintended torque limit is enabled.
(When the torque limit is enabled,
limiting torque (TLC) is on. )
The maximum torque is insufficient.
1. Shortage of servo capacity.
2. Too large load.
The setting of the torque limit is
incorrect.
(Set with parameter
No.PA11, PA12, PC35)
1. The servo gain is low.
2. The auto tuning response is low.
Servo-on has been on at power-on.
1. The sequence of releasing the
electromagnetic brake is incorrect.
2. The power supply for the
electromagnetic brake is
malfunctioning.
The output circuit is in open phase.
Detection of a zero pulse is near dog off
position. (Dog type home position return)
The in-position range is too large.
1. The proximity dog switch is faulty.
2. The installation of the proximity dog is
faulty.
Possible cause
11 - 24
Action
Increase the auto tuning response, and
readjust the gain. (Refer to chapter 9.)
Cancel the torque limit.
1. Reduce the load by changing the
mass and shape of the workpiece.
2. Reduce the effective load ratio by
increasing acceleration/deceleration
time.
Review the torque limit setting.
Increase the auto tuning response, and
readjust the gain. (Refer to chapter 9.)
Review the controller programs.
1. Review the sequence of releasing
the electromagnetic brake.
2. Check the power supply for the
electromagnetic brake.
Review the wiring of the servo motor
power cable.
Adjust the installation of the proximity
dog switch.
Set a narrower in-position range.
1. Repair or replace the proximity dog
switch.
2. Adjust the installation of the
proximity dog switch.