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3. SIGNALS AND WIRING
3.7 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 forced stop signal.
EM1RA
24VDC
Contacts must be open when
servo-on signal is off or when an
alarm (trouble) is present and when
an electromagnetic brake signal.
Electromagnetic brake
Servo motor
Circuit must be
opened during
forced 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) 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.
2) The brake will operate when the power (24VDC) switches off.
3) Switch off the servo-on command after the servo motor has stopped.
(1) Connection diagram
MBR
COM
Servo amplifier
Servo motor
Z
B1
B2
Forced
stop
RA
24VDC
RA
VDD
(2) Setting
In parameter No.21 (electromagnetic brake sequence output), set the time delay (Tb) from
electromagnetic brake operation to base circuit shut-off at a servo off time as in the timing chart in (3)
in this section.