Mitsubishi Electric Melservo-J3 Series MR-J3-B, Instruction Manual

Page: 378 / 802

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