Servo enable (/ S-ON) signal
Motor power on
Brake (/BK) instruction
Position / speed /
torque instruction
Motor speed
ON
OFF
P1-55
P1-54
ON
OFF
OFF
OFF
ON
OFF
OFF
Brake
Brake release
(Not brake)
Brake closed
(Brake)
*1 *1
*3
Not receive instruction
receive instruction
0 rpm
*2
Figure 4-21 holding brake release delay time and closing
*1：For different motors, the brake delay time is different. Please refer to table 3-11 and the actual circumstances
*2：It has been set by P1-54 that the time from the servo drive receiving enable (/ S-ON) instruction to it can receive position, speed and torque
instruction should be bigger than the time for brake to release. When the upper computer output instruction to servo motor, please wait until
S-ON signal is ON.
*3：Please set the brake running and the servo OFF time by P1-55, P1-56, P1-57.
4.7.2.2 Servo motor brake signal (/ BK) output time when is stopped
When used in the vertical axis, the weight of moving parts may cause slight movement. By setting P1-55, we can make motor in power off state
after the brake is closed to eliminate the slight movement.
Servo enable (/S-ON)signal
Motor power on
Brake (/ BK) instruction
ON
P1-55
ON
OFF
OFF
Brake release
(open)
Brake closed
(brake)
Figure 4-22 Servo cancel enable the brake operation timing
Remark：
When an alarm occurs, P1-55will be invalid, the servo motor will be in powered off state
immediately. In this case, the movement unit may move before the brake action.
4.7.2.3 Servo motor brake signal (/ BK) output time in rotation
When an alarm occurs in the servo motor rotation, or the servo motor rotation forcibly cancel the enable signal, the servo motor will be in
powered off state immediately. In this case, by setting P1-56 (output speed value brake instruction) and P1-57(servo OFF-brake instruction
waiting time), you can adjust the brake signal (/ BK) output time.
Brake operating condition when the servo motor rotation
When any one of the following condition is satisfied, the brake will be enable:
When the motor is in powered off state, and the speed motor is below the value as P1-56 set.
When the motor is in powered off state, and after a period as P1-57 set.
Motor Power State
Brake (/ BK)
instruction)
Motor speed
ON
P1-56
Brake release
(open)
Brake closed
(brake)
ON
OFF
OFF
Servo enable (/ S-ON) signal
Or Failure
Or Power OFF
Coast to stop
P1-57
Figure 4-23 servo motor brake action during rotation
Remark：
Even the set value in P1-56 is faster than the maximum motor speed, it will also be limit
by the motor speed.
Do not place the motor rotation signal (TGON) and brake signal (BK) to one terminal. If
they are assigned to one terminal, the brake may not work.
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