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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 interface unit signals but also by an external forced stop (EM1).

EM1

RA

24VDC

Contacts must be open when
servo-off, when an alarm occurrence
and when an electromagnetic brake 
interlock (MBR).

Electromagnetic brake

Servo motor

Circuit must be 
opened during
forced stop (EM1).

The electromagnetic brake is provided for holding 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 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.

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.
4) Using the IFU parameter No.10, select the axis number of the drive unit which uses the

electromagnetic brake interlock (MBR).

(1) Connection diagram

Interface unit

or

extension IO unit

Servo motor

Forced

stop

24VDC

SG

MBR

RA

B2

B1

24VDC

RA

(2) Setting

In DRU parameter No.21 (electromagnetic brake sequence output), set the delay time (Tb) from
electromagnetic brake operation to base circuit shut-off at a servo off time as in the timing chart in (4)
in this section.