Mitsubishi Electric MELSERVO-J3 Series Instruction Manual page 378

11. TROUBLESHOOTING
Description
The servo motor When using a manual pulse
does not operate. generator, check the wiring and
the assignment of command
pulse multiplication setting (input
signals MD0, TP0, TP1) and
parameter No.PA05).
The speed of the Check the settings of the speed
servo motor is command and electronic gear.
not increased. Or
Check the servo motor power
the speed is
cable.
increased too
Check if the voltage of the main
much.
circuit power supply dropped.
For a servo motor with an
electromagnetic brake, check the
power supply of the
electromagnetic brake.
The servo motor If the servo motor can be driven
vibrates with low safely, repeat acceleration and
frequency deceleration three times or more
to complete auto tuning.
Check the command from the
controller.
Check if the mechanical part is
malfunctioning.
(Example)
1. If the timing belt is loose.
2. If it has abrasion.
Check if the required torque of the
machine exceeds the maximum
torque of the servo motor.
Increase the auto tuning response
(parameter No.PA09).
(Except for the manual mode)
Check method
Wiring or the command pulse
multiplication setting is incorrect.
Between DICOM and OPC of the CN6
connector in the servo amplifier
is not connected.
The settings of the speed command
and electronic gear are incorrect.
Output circuit is in open phase.
The voltage of the main circuit power
supply has dropped.
The electromagnetic brake has not been
released.
Failed to estimate the load to motor
inertia ratio by auto tuning.
When the auto tuning mode 2 or the
manual mode is used, the setting of load
to motor inertia ratio (Parameter
No.PB06) is incorrect.
The command from the controller is
unstable.
Load of the mechanical part has
changed.
Torque during acceleration/deceleration
is overshooting exceeding the limit of the
servo motor when the motor stops.
1. The servo gain is low.
2. The auto tuning response is low.
Possible cause
11 - 21
Action
Review the wiring or the command
pulse multiplication setting.
Connect between DICOM and OPC.
Review the settings of the speed
command and electronic gear.
Review the wiring of the servo motor
power cable.
1. Set the main circuit power supply
within the permissible voltage
fluctuation range of specifications.
2. Review the wiring of the main circuit
power supply.
Turn on the power of electromagnetic
brake to release the brake.
Adjust gains.
(Refer to chapter 9.)
When the auto tuning mode 2 or the
manual mode is used, review the
setting of load to motor inertia ratio
(Parameter No.PB06).
1. Review the command from the
controller.
2. Check if the cable for a command
has any failure, such as a
disconnection.
1. Readjust the gain.
(Refer to chapter 9.)
2. Maintain the mechanical part.
Reduce the load ratio by increasing
acceleration/deceleration time or
decreasing the mass of work, etc.
Increase the auto tuning response, and
readjust the gain.
(Refer to chapter 9.)