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5.2.5 Power-off brake 
When the servo motor controls the vertical load, the purpose of using the “brake servo motor” is: 
when the power supply of the system is placed in the "OFF", the movable part will not move under the 
action of gravity. 
Electric loss 
brake
Prevent from 
falling due to 
self-weight 
when power 
supply OFF
Mechanical 
Motion part
                     
 
Note: The brake built in the servo motor is a fixed special brake without excitation. It can not be used 
for dynamic braking. Please use it only when the servo motor is in a stop state. 
  Related parameter 
Brake command 
output speed   
 
(1) Hardware wiring 
The ON/OFF circuit of the brake is composed of the sequential output signal of the servo unit "/BK" 
and "brake power supply". A typical connection example is shown below. 
M
PG
BK
U
V
W
PE
24V
24V
CN0
SO1
COM
BK-RY
BK-RY
Power 
supply
Servo driver Servo motor
CN2
L
N