Mitsubishi Electric Melservo-J4 Instruction Manual page 5

CAUTION
● Configure a circuit to turn off EM2 or EM1 when the main circuit power supply is turned off to prevent
an unexpected restart of the servo amplifier (drive unit).
● To prevent malfunction, avoid bundling power lines (input/output) and signal cables of the servo
amplifier (drive unit) and the converter unit together or running them in parallel to each other. Separate
the power lines from the signal cables.
[Usage]
CAUTION
● Before resetting an alarm, make sure that the run signal of the servo amplifier (drive unit) is off in
order to prevent a sudden restart. Otherwise, it may cause an accident.
● Use the servo amplifier (drive unit) and converter unit with the specified servo motor.
● Wire options and peripheral equipment, etc. correctly in the specified combination. Otherwise, it may
cause an electric shock, fire, injury, etc.
● If the dynamic brake is activated at power-off, alarm occurrence, etc., do not rotate the servo motor by
an external force. Otherwise, it may cause a fire.
[Corrective actions]
CAUTION
● 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 interlocked with an external emergency stop
switch.
● When an alarm occurs, eliminate its cause, ensure safety, and deactivate the alarm to restart
operation.
● If the molded-case circuit breaker or fuse is activated, be sure to remove the cause and secure safety
before switching the power on. If necessary, replace the servo amplifier (drive unit) and converter unit,
and recheck the wiring. Otherwise, it may cause smoke, fire, or an electric shock.
● Provide an adequate protection to prevent unexpected restart after an instantaneous power failure.
● After an earthquake or other natural disasters, ensure safety by checking the conditions of the
installation, mounting, wiring, and equipment before switching the power on to prevent an electric
shock, injury, or fire.
Contacts must be opened when ALM
(Malfunction) or MBR (Electromagnetic
brake interlock) turns off.
Servo motor
B
U
Electromagnetic brake
Contacts must be opened with
the emergency stop switch.
RA
24 V DC
3