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3. SIGNALS AND WIRING
3.9 Servo motor with electromagnetic brake
CAUTION
Configure the electromagnetic brake operation circuit so that it is activated not only
by the servo amplifier signals but also by an external emergency stop signal.
EMGRA
24VDC
Contacts must be open when
servo-on signal is off or when an
alarm (trouble) is present and when
an electromagnetic brake signal.
Electroma
g
netic brake
Servo motor
Circuit must be
opened during
emergency stop signal.
The electromagnetic brake is provided for holding purpose and must not be used
for ordinary braking.
POINT
Refer to the Servo Motor Instruction Manual for specifications such as the
power supply capacity and operation delay time of the electromagnetic
brake.
Note the following when the servo motor equipped with electromagnetic brake is used for applications
requiring a brake to hold the motor shaft (vertical lift applications):
1) Set "
1 " in parameter No.1 to make the electromagnetic brake interlock signal (MBR) valid.
Note that this will make the zero speed signal (ZSP) unavailable.
2) Do not share the 24VDC interface power supply between the interface and electromagnetic
brake. Always use the power supply designed exclusively for the electromagnetic brake.
3) The brake will operate when the power (24VDC) switches off.
4) While the reset signal is on, the base circuit is shut off. When using the servo motor with a
vertical shaft, use the electromagnetic brake interlock signal (MBR).
5) Switch off the servo-on signal after the servo motor has stopped.
(1) Connection diagram
MBR
COM
Servo amplifier
Servo motor
Z
B1
B2
Emergency
stop
RA
24VDC
RA
VDD
(2) Setting
1) Set "
1 " in parameter No.1 to make the electromagnetic brake interlock signal (MBR) valid.
2) Using parameter No. 33 (electromagnetic brake sequence output), set a time delay (Tb) at servo-off
from electromagnetic brake operation to base circuit shut-off as in the timing chart shown in (3) in
this section.