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5.2.5 Electric loss brake（BK）
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.
1. Connection examples
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
Note:
(1) The voltage of the power-loss brake is 24V.
(2) In the figure above, the BK signal is output by SO1, and the parameter P5-44 should be set to
n.0001.
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