5 Operation
5.2.4 Holding Brakes
5-12
(5) Brake (/BK) Signal Output Timing during Servomotor Operation
If an alarm occurs while the servomotor is rotating, the servomotor will come to a stop and the brake (/BK)
signal will be turned OFF. The timing of brake signal (/BK) output can be adjusted by setting the brake refer-
ence output speed level (Pn507) and the waiting time for brake signal when motor running (Pn508).
Note: If the servomotor is set so that it comes to a zero-speed stop for an alarm, follow the information in (4) Brake ON
Timing after the Servomotor Stops after the motor comes to a stop for a zero position reference.
/BK Signal Output Conditions When
Servomotor Running
The /BK signal goes to high level (brake
ON) when either of the following condi-
tions is satisfied:
• When the motor speed falls below the
level set in Pn507 after the power to the
servomotor is turned OFF.
• When the time set in Pn508 is exceeded
after the power to the servomotor is
turned OFF.
Pn507
Brake Reference Output Speed Level
Classification
Setting Range Setting Unit Factory Setting When Enabled
0 to 10000
1 min
-1
100 Immediately Setup
Pn508
Waiting Time for Brake Signal When Motor Running
Classification
Setting Range Setting Unit Factory Setting When Enabled
10 to 100 10 ms 50 Immediately Setup
• The servomotor will be limited to its maximum speed even if the value set in Pn507 is
higher than the maximum speed.
• Do not allocate the motor rotation detection signal (/TGON) and the brake signal (/BK)
to the same terminal, or otherwise the /TGON signal will be turned ON by the falling
speed on a vertical axis, and the brake may not be turned ON.
For the /BK signal, do not use the terminal that is already being used for another
signal.
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