(1) When SO terminal is used to control holding brake, when servo enable is on, holding brake power
is on and motor is in rotatable state;
(2) If the motor fails to rotate during the debugging of the new machine, please confirm whether the
holding brake is open.
(3) Time sequence of holding brake control
① Holding brake sequence in normal state
Due to the action delay time of the brake, the machine moves slightly under the action of gravity.
Use P5-07 parameter to adjust the time, so that the holding brake can be opened or closed in advance.
When setting the servo motor with brake, the output signal "/ BK" of control brake and the time of
servo SON signal on/off action are shown in the figure below. That is to say, before the /BK signal
outputting and brake is opened, the servo motor has entered the power on enabling state; after the / BK
not outputting and brake is locked, the servo motor will turn off the power on state.
Servo off advance
P5-07 lock
/S-ON input
/BK output
Servo on lag
P5-07 holding brake open
Note: the setting made here is the time when TGON of rotation detection is invalid when the
motor is stopped.
② Abnormal state holding brake timing
When the alarm/power supply interruption occurs, the motor quickly becomes non energized.
During the time from gravity or inertia to the brake action, the machine will move. To avoid this,
The conditions for the /BK signal to turn from on to off in the motor rotation are as follows (any
of the two conditions will take effect):
1) After the servo is off, the motor speed is below the set value of P5-08;
2) After the servo is off, when the set time of P5-09 is exceeded.
The sequence diagram is as follows:
/ S-ON input or
alarm power off
Motor rotation
speed (Rpm)
/BK output
P5-08
Deceleration
stop or free
stop
Servo
ON
Servo
OFF
Brake locked
Brake
release
P5-09
/ S-ON input or
alarm power off
Motor rotation
speed (Rpm)
/BK output
P5-08
Deceleration
stop or free
stop
Servo
ON
Servo
OFF
Brake locked
Brake
release
P5-09
Since the brake of the servo motor is designed for position holding, it must be enabled at the right time
when the motor stops. While observing the action of the machine, adjust the user parameters.
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