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

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17 - 69
17. SPEED CONTROL OPERATION
Description Check method Possible cause Action
An abnormal
value is displayed
in the monitor
values of MR
Configurator. Check if the model selection is set
correctly.
Check with "system setting"
command of "Set up" menu. The model being connected differs from
the model set in the model selection. Set the model correctly.
For a servo
motor with an
electromagnetic
brake, the brake
went out. Remove the servo motor and all
the wiring from the machine, and
check if the servo motor shaft can
be rotated by the hands.
(If it is rotated by the hands, the
electromagnetic brake has a
failure.) Expiration of life or a failure of
electromagnetic brake.
For the life of electromagnetic brake,
refer to "Servo Motor Instruction Manual
(Vol. 2)". Change the servo motor.
The coasting
distance of the
servo motor
became longer. Check if the load was increased. If the load was increased, the
permissible load to motor inertia ratio of
the dynamic brake was exceeded.
(Refer to section 13.3.) 1. Reduce the load.
2. Change the servo amplifier.
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.
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.
1. Change the external relay.
2. Check the wiring.
3. Change the servo motor.