Mitsubishi Electric MELSERVO MR-J4-B-LL Series Instruction Manual page 6

(4) Usage
Provide an external emergency stop circuit to stop the operation and shut the power off immediately.
Do not disassemble, repair, or modify the equipment.
Before resetting an alarm, make sure that the run signal of the servo amplifier is off in order to prevent a
sudden restart. Otherwise, it may cause an accident.
Use a noise filter, etc. to minimize the influence of electromagnetic interference. Electromagnetic
interference may affect the electronic equipment used near the servo amplifier.
Do not burn or destroy the servo amplifier. Doing so may generate a toxic gas.
Use the servo amplifier with the specified servo motor.
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
Ensure safety by confirming the power off, etc. before performing corrective actions. Otherwise, it may
cause an accident.
If it is assumed that a power failure or product malfunction may result in a hazardous situation, use a
servo motor with an electromagnetic brake or provide an external brake system for holding purpose to
prevent such hazard.
Configure an electromagnetic brake circuit, which is activated by an external emergency stop switch.
When an alarm occurs, eliminate its cause, ensure safety, and deactivate the alarm to restart operation.
Provide an adequate protection to prevent unexpected restart after an instantaneous power failure.
(6) Maintenance, inspection and parts replacement
Make sure that the emergency stop circuit operates properly such that an operation can be stopped
immediately and a power is shut off by the emergency stop switch.
It is recommended that the servo amplifier be replaced every 10 years when it is used in general
environment.
When using the servo amplifier that has not been energized for an extended period of time, contact your
local sales office.
Contacts must be opened when ALM
(Malfunction) or MBR (Electromagnetic
brake interlock) turns off.
Servo motor
B
U
Electromagnetic brake
CAUTION
CAUTION
Contacts must be opened
with the emergency stop switch.
RA
24 V DC
CAUTION
A - 5