Mitsubishi Electric MELSERVO-J3 Series Instruction Manual page 681

16. INDEXER POSITIONING OPERATION
Description
Check the servo motor power
The servo motor
cable.
vibrates.
Check if the vibration varies
depending on the speed.
Check the mounting accuracy of
the servo motor and machine.
Check the load for the servo
motor axis.
Check the vibration from outside. An external vibration propagated to the
The rotation 1. If the servo motor can be driven
accuracy is low. safely, repeat acceleration and
deceleration three times or
(The rotation
speed is more to complete auto tuning.
unstable.) 2. Increase the auto tuning
response (parameter
No.PA09). (Except for manual
mode)
Check if the limiting torque (TLC)
is in 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 or four times
to complete auto tuning.
2. Increase the auto tuning
response (parameter
No.PA09). (Other than manual
mode)
Check method
The output circuit is open phase.
An unbalanced torque of the machine
side is large.
The eccentricity due to a core gap is
large.
The load for the servo motor axis is
large.
servo motor.
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, the
torque limit (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 PA11, PA12, PC35.)
1. The servo gain is low.
2. The auto tuning response is low.
Possible cause
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Action
Review the wiring of the servo motor
power cable.
Adjust the balance of the machine
side.
Review the direct accuracy.
Adjust the load for the shaft within the
specifications of the servo motor.
For the shaft permissible load, refer to
"Servo Motor Instruction Manual (Vol.
2)".
Prevent the vibration from the external
vibration source.
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.
Check the torque limit setting.
Increase the auto tuning response, and
readjust the gain. (Refer to chapter 9.)