Mitsubishi Electric MR-J4W2, Instruction Manual

Page: 6 / 542

A - 5
CAUTION
The electromagnetic brake on the servo motor is designed to hold the motor shaft and should not be
used for ordinary braking.
For such reasons as service life and mechanical structure (e.g. where a ball screw and the servo motor
are coupled via a timing belt), the electromagnetic brake may not hold the motor shaft. To ensure safety,
install a stopper on the machine side.
(5) Corrective actions
CAUTION
When it is assumed that a hazardous condition may occur due to a power failure or product malfunction,
use a servo motor with an electromagnetic brake or external brake to prevent the condition.
Configure an electromagnetic brake circuit so that it is activated also by an external EMG stop switch.
Servo motor
Electromagnetic brake
B
RA
Contacts must be opened
with the EMG stop switch.
Contacts must be opened when CALM (AND
malfunction) or MBR (Electromagnetic brake
interlock) turns off.
24 V DC
When any alarm has occurred, eliminate its cause, ensure safety, and deactivate the alarm before
restarting operation.
Provide an adequate protection to prevent unexpected restart after an instantaneous power failure.
(6) Maintenance, inspection and parts replacement
CAUTION
With age, the electrolytic capacitor of the servo amplifier will deteriorate. To prevent a secondary
accident due to a malfunction, it is recommend that the electrolytic capacitor be replaced every 10 years
when it is used in general environment. Please contact your local sales office.
When using a servo amplifier whose power has not been turned on for a long time, contact your local
sales office.
(7) General instruction
To illustrate details, the equipment in the diagrams of this Instruction Manual may have been drawn
without covers and safety guards. When the equipment is operated, the covers and safety guards must
be installed as specified. Operation must be performed in accordance with this Specifications and
Instruction Manual.