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

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(4) Usage
CAUTION
Provide an external emergency stop circuit to ensure that operation can be stopped and power switched
off immediately.
Any person who is involved in disassembly and repair should be fully competent to do the work.
Before resetting an alarm, make sure that the run signal of the servo amplifier is off to prevent an
accident. A sudden restart is made if an alarm is reset with the run signal on.
Do not modify the equipment.
Use a noise filter, etc. to minimize the influence of electromagnetic interference, which may be caused by
electronic equipment used near the servo amplifier.
Burning or breaking a servo amplifier may cause a toxic gas. Do not burn or break a servo amplifier.
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
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 an external brake to prevent the condition.
Configure an electromagnetic brake circuit so that it is activated also by an external emergency stop
switch.
U
RA
Contacts must be opened when servo-on
(RYn0) OFF, malfunction (ALM) OFF
or electromagnetic brake interlock
(MBR) OFF.
24VDC
Electromagnetic brake
B
Circuit must be opened with
the emergency stop switch.
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.