Mitsubishi Electric MELSERVO-J3 Series Instruction Manual page 753

17. SPEED CONTROL OPERATION
Description
Overshoot/under 1. Check the velocity waveform
shoot occurs. with "Graph" command of
"Monitor" menu on MR
Configurator, and check if
overshoot/undershoot is
occurring.
2. If the servo motor can be driven
safely, repeat acceleration and
deceleration three times or
more to complete auto tuning.
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.
Check if there is a backlash on
the machine part.
Communication Check if they are on-line.
with the servo
amplifier fails
using MR
Configurator.
Check if the communication cable
has any failure such as damage.
Check the communication
settings, such as the baud rate
and ports.
Check with "system setting"
command of "Set up" menu.
Check if the model selection is set
correctly.
Check with "system setting"
command of "Set up" menu.
In the device manager on the
personal computer, check if
"MITSUBISHI MELSERVO USB
Controller" is being displayed
under the USB (Universal Serial
Bus) controller.
Check method
1. The servo gain is low or too high.
2. The auto tuning response is low or too
high.
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.)
There is a backlash between the servo
motor and the machine (such as a gear
and coupling).
They are off-line.
Communication cable fault.
The communication setting is incorrect.
The model being connected differs from
the model set in the model selection.
The driver is not set correctly.
Possible cause
17 - 68
Action
Adjust the auto tuning response, and
readjust the gain. (Refer to chapter 9.)
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.
Adjust the backlash on the coupling
and the machine part.
Set them to on-line.
Select "on-line" in the system setting of
the "Set-up" menu.
Change the communication cable.
Set the communication correctly.
Set the model setting correctly.
Delete an unknown device or other
devices, cycle the power of the servo
amplifier, and then set the driver again
according to Found New Hardware
Wizard.
For details, refer to Help of MR
Configurator.