35
5-2-5. Power-off Brake (BK)
It is used when servo drive controls the vertical shaft. The function of power-off brake is
the moveable part will not shift when servo is OFF.
(1)
Wiring Example
The ON/OFF circuit of brake includes sequence output signal /BK and brake power. The
following diagram shows a standard wiring example.
Note: the working voltage of brake is DC 24V, current is about 0.6A.
(2)
Brake signal
(3)
Servo OFF delay time (after servo motor stop)
If the machine moves slightly due to gravity because of the brake has action delay time.
Please adjust the time as below parameter.
P5-06
Servo OFF delay time (brake command)
Unit
Default
Range
Suitable mode
Modify
Effective
1ms
0
0~500
All the modes
Servo OFF
Immediately
This parameter is used to set the output time from the brake control signal /BK to the
servo OFF operation (servomotor output stop). The setting is under the condition of motor
stop and TGON invalid.
Parameter Signal
Type
Default
Explanation
Modify
P5-34
/BK
Output n.0000
Need to distribute
Range 0000-0013
/BK signal can output from output terminal via setting parameter P5-34, please refer to chapter 5-12-3.
When set P5-34=0001, it means output from SO1 terminal.
+24V
BK-RY
L
N
U
V
W
PE
SO1
COM
U
V
W
PE
M
PG
CN2
BK
1
2
3
Servo drive
+24V
BK-RY
Power supply
Servo motor with brake
Power-off brake
Prevent the part
moving as gravity
when servo is OFF
Servo
motor
The brake built into the MS series servo motor
with brakes is a de-energization brake, which is
used only to hold and cannot be used for
braking.