Mitsubishi Electric MELSERVO-J3 Series Instruction Manual page 754

17. SPEED CONTROL OPERATION
Description
An abnormal Check if the model selection is set
value is displayed correctly.
in the monitor Check with "system setting"
values of MR command of "Set up" menu.
Configurator.
For a servo Remove the servo motor and all
motor with an the wiring from the machine, and
electromagnetic check if the servo motor shaft can
brake, the brake be rotated by the hands.
went out. (If it is rotated by the hands, the
electromagnetic brake has a
failure.)
The coasting Check if the load was increased.
distance of the
servo motor
became longer.
For servo motor with an
electromagnetic brake
1. Check if the external relay
connected to the
electromagnetic brake interlock
(MBR) operates normally.
2. Check if the electromagnetic
brake is malfunctioning.
Check method
The model being connected differs from
the model set in the model selection.
Expiration of life or a failure of
electromagnetic brake.
For the life of electromagnetic brake,
refer to "Servo Motor Instruction Manual
(Vol. 2)".
If the load was increased, the
permissible load to motor inertia ratio of
the dynamic brake was exceeded.
(Refer to section 13.3.)
1. An external relay is malfunctioning.
2. The wiring of electromagnetic brake
interlock (MBR) is incorrect.
3. Expiration of life or a failure of
electromagnetic brake.
Possible cause
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Action
Set the model correctly.
Change the servo motor.
1. Reduce the load.
2. Change the servo amplifier.
1. Change the external relay.
2. Check the wiring.
3. Change the servo motor.