Mitsubishi Electric GENERAL PURPOSE AC SERVO MR-E- A/AG Instruction Manual page 6

(5) Corrective actions
When it is assumed that a hazardous condition may take place at the occur due to a power failure or a
product fault, use a servo motor with electromagnetic brake or an external brake mechanism for the
purpose of prevention.
Configure the electromagnetic brake circuit so that it is activated not only by the servo amplifier signals
but also by an external emergency stop signal (EMG).
When any alarm has occurred, eliminate its cause, ensure safety, and deactivate the alarm before
restarting operation.
When power is restored after an instantaneous power failure, keep away from the machine because the
machine may be restarted suddenly (design the machine so that it is secured against hazard if restarted).
(6) Storage for servo motor
Note the following points when storing the servo motor for an extended period of time (guideline: three or
more months).
Always store the servo motor indoors in a clean and dry place.
If it is stored in a dusty or damp place, make adequate provision, e.g. cover the whole product.
If the insulation resistance of the winding decreases, reexamine the storage method.
Though the servo motor is rust-proofed before shipment using paint or rust prevention oil, rust may be
produced depending on the storage conditions or storage period.
If the servo motor is to be stored for longer than six months, apply rust prevention oil again especially to
the machined surfaces of the shaft, etc.
Before using the product after storage for an extended period of time, hand-turn the motor output shaft to
confirm that nothing is wrong with the servo motor. (When the servo motor is equipped with a brake,
make the above check after releasing the brake with the brake power supply.)
(7) Maintenance, inspection and parts replacement
With age, the electrolytic capacitor will deteriorate. To prevent a secondary accident due to a fault, it is
recommended to replace the electrolytic capacitor every 10 years when used in general environment.
Please consult our sales representative.
(8) 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 Instruction Manual.
CAUTION
Contacts must be open when
servo-on signal is off, when an
alarm (trouble) is present and when
an electromagnetic brake signal.
Servo motor
Electromagnetic brake
CAUTION
CAUTION
Circuit must be
opened during
emergency stop signal.
RA EMG
24VDC
A - 5