Electromagnetic Brake Characteristics - Mitsubishi Electric EZMOTION MR-E Super MR-E-10A-QW003 Instruction Manual

14. SERVO MOTOR

14.2.4 Electromagnetic brake characteristics

CAUTION
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The servo motor with electromagnetic brake can be used to prevent a drop in vertical lift applications or to
ensure double safety at an emergency stop, for example. When performing servo motor operation, supply
power to the electromagnetic brake to release the brake. Switching power off makes the brake effective.
(1) Electromagnetic brake power supply
Prepare the following power supply for use with the electromagnetic brake only. The electromagnetic brake
terminals (B1, B2) have no polarity.
24VDC power
supply for
electromagnetic brake
The surge absorber (VAR) must be installed across B1-B2. For the selection of the surge absorber, refer to
section 13.2.5.
(2) Sound generation
Though the brake lining may rattle during operation, it poses no functional problem.
If braking sound occurs, it may be improved by setting the machine resonance suppression filter or
adaptive vibration suppression control in the servo amplifier parameters. For details, refer to section 8.2
and 8.3.
(3) Others
A leakage magnetic flux will occur at the shaft end of the servo motor equipped with electromagnetic brake.
Note that chips, screws and other magnetic substances are attracted.
The electromagnetic brake is provided to prevent a drop at a power failure or
servo alarm occurrence during vertical drive or to hold a shaft at a stop. Do not
use it for normal braking (including braking at servo lock).
The brake has a time lag. Use the brake so that servo motor control is started
after the brake has completely opened.
Configure the electromagnetic brake operating circuit as a double circuit so that it
will also be operated by an external emergency stop (EMG).
For details of the circuit configuration and timing chart, refer to section 3.5 and
3.7.
RA
B1
Switch
VAR
B2
24VDC power
supply for
electromagnetic brake
or
14 - 4
RA
B1
Switch
VAR
B2