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3. SIGNALS AND WIRING
3.11 Servo motor with an electromagnetic brake
3.11.1 Safety precautions
CAUTION
Configure an electromagnetic brake operation circuit which interlocks with an
external emergency stop switch.
Servo motor
Electromagnetic brake
B
SON RA
Circuit must be opened
with the emergency stop
switch.
Shut off the servo motor when
Servo-on (SON), Malfunction
(ALM), or Electromagnetic brake
interlock (MBR) are turned OFF.
24VDC
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.
Do not use the 24VDC interface and control circuit power supplies for the
electromagnetic brake. Always use the power supply designed exclusively for the
electromagnetic brake. Otherwise, a fault may occur.
POINT
Refer to chapter 12 for specifications such as the power supply capacity and
operation delay time of the electromagnetic brake.
Switch off the servo-on (SON) after the servo motor has stopped.
Refer to (3) in section 12.1.3 for the selection of the surge absorbers for the
electromagnetic brake.
Note the following when the servo motor with an electromagnetic brake is used.
1) Always assign the electromagnetic brake interlock (MBR) to CN1-12 pin by parameter No. PD18.
(MBR is assigned to CN1-12 pin by default.)
2) The electromagnetic brake operates when the power (24VDC) turns off.
3) While the reset (RES) is on, the base circuit is shut off. When using the servo motor with a vertical
shaft, use the electromagnetic brake interlock (MBR).
3.11.2 Setting
(1) Set "
05 " to parameter No. PD18 to assign the electromagnetic brake interlock (MBR) to CN1-12 pin.
(2) Using parameter No. PC09 (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 section
3.11.3 (1).
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