Yaskawa Sigma-5 User Manual: Design and Maintenance - Linear Motors - Manual (Page 111)

4.2 Settings for Common Basic Functions
4-21
4
Operation
(5) Brake Signal (/BK) Output Timing during Servomotor Movement
If an alarm occurs while the servomotor is moving, the servomotor will come to a stop and the brake signal
(/BK) will be turned OFF. The timing of brake signal (/BK) output can be adjusted by setting the brake refer-
ence output speed level (Pn583) 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 servomotor comes to a stop for a zero position reference.
• When using the servomotor to control a vertical
axis, the machine movable part may shift slightly
depending on the brake ON timing due to gravity or
an external force. To eliminate this slight shift, set
parameter so that the power to the servomotor turns
OFF after the brake is applied.
• This parameter changes the brake ON timing while
the servomotor is stopped.
Servo ON
command
/BK output
Power to motor
Brake released
(ON)
Servo ON
Power to motor
Brake applied
(OFF)
Servo OFF
No power to motor
Pn506
MECHA
The servomotor will turn OFF immediately when an alarm occurs, regardless of the set-
ting of this parameter. The machine movable part may shift due to gravity or external
force before the brake operates.
Pn583
Brake Reference Output Speed Level
Classification
Setting Range Setting Unit Factory Setting When Enabled
0 to 10000 1 mm/s 10 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
Speed Position Force
Speed Position Force
/BK Signal Output Conditions
When Servomotor Moving
The /BK signal goes to high level
(brake ON) when either of the fol-
lowing conditions is satisfied:
• When the motor speed falls
below the level set in Pn583
after the power to the servomo-
tor is turned OFF.
• When the time set in Pn508 is
exceeded after the power to the
servomotor is turned OFF.
Servo ON
command
or alarm or power OFF
Motor speed
Pn583
Servo ON Servo OFF
Motor stopped by applying
DB or by coasting

Pn001.0
Pn508
Power to motor
ON
OFF
/BK output
Brake
released
(ON)
Brake applied
(OFF)
48 and 65
• The servomotor will be limited to its maximum speed even if the value set in Pn583 is
higher than the maximum speed.
• Do not allocate the movement detection signal (/TGON) and the brake signal (/BK) to
the same terminal. The /TGON signal will otherwise be turned ON by the falling speed
on a vertical axis, and the brake may not operate.
For the /BK signal, do not use the terminal that is already being used for another
signal.