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3. SIGNALS AND WIRING
3.11 Servo motor with an electromagnetic brake
3.11.1 Safety precautions
CAUTION
Configure the electromagnetic brake circuit so that it is activated not only by the
interface unit signals but also by a forced st op (EM1).
EM1RA
24VDC
Contacts must be open when
servo-off, when an alarm occurrence
and when an electromagnetic brake
interlock (MBR).
Electroma
g
netic brake
Servo motor
Circuit must be
opened during
forced stop (EM1).
The electromagnetic brake is provided for hol ding purpose and must not be used
for ordinary braking.
Before performing the operation, be sure to confirm that the electromagnetic brake
operates properly.
POINT
Refer to the Servo Motor Instruction Manual (Vol.2) for specifications s uch as
the power supply capacity and operation delay time of the electromagnet ic
brake.
Note the following when the servo motor with an el ectromagnetic brake is used.
1) Do not share the 24VDC interface power supply bet ween the interface and electromagnetic brake.
Always use the power supply designed exclusively for the electromagn etic brake.
2) The brake will operate when the power (24VDC) switches off.
3) Switch off the servo-on command after the ser vo motor has stopped.
(1) Connection diagram
Servo amplifier Servo motor
B1
B2
Forced
stop
24VDC
Electromagnetic
brake
Trouble
(ALM)
DICOM
MBR RA1
DOCOM
24VDC
(2) Setting
In parameter No.PC02 (electromagnetic brake s equence output), set the time delay (Tb) from
electromagnetic brake operation to base circu it shut-off at a servo off time as in the timing c hart in section
3.11.2.