8 Operation
8.3.4 Setting for Holding Brakes
8-24
(2) Brake Interlock Output (/BK)
(3) Allocating Brake Interlock Output Signals (/BK)
The brake interlock output signal (/BK) is not used with the factory settings. The output signal must be allocated.
(4) Setting the Brake ON Timing after the Servomotor Stops
With the standard setting, the /BK signal is output at the same time as the servo is turned OFF. The servo OFF
timing can be changed with a parameter.
Type
Name
Connector Pin
Number
Setting
Meaning
Output /BK
Must be allocated
ON (low level)
Releases the brake.
OFF (high level)
Applies the brake.
This output signal controls the brake and is used only for a servomotor with a brake. This output signal is not used with the
factory settings. The output signal must be allocated (with Pn50F). It does not need to be connected for servomotors with-
out a brake.
IMPORTANT
The /BK signal is not output during overtravel, or when there is no power to the servomotor.
Parameter
Connector Pin Number
Meaning
+ Terminal
- Terminal
Pn50F
n.
0
−
−
The /BK signal is not used. (Factory setting)
n.
1
CN1-25
CN1-26
The /BK signal is output from output terminal CN1-25, 26.
n.
2
CN1-27
CN1-28
The /BK signal is output from output terminal CN1-27, 28.
n.
3
CN1-29
CN1-30
The /BK signal is output from output terminal CN1-29, 30.
IMPORTANT
When set to the factory setting, the brake interlock output signal (/BK) is invalid. When multiple signals are allocated to
the same output terminal, the signals are output with OR logic. To output the /BK output signal alone, disable the other
output signals or set them to output terminals other than the one allocated to the /BK output signal. For the allocation of
SERVOPACK output signals other than /BK output signal, refer to
7.3.3 Output Circuit Signal Allocation
.
Pn506
Delay Time from Brake Reference Until Servo OFF
Setting Range
Setting Unit
Factory Setting
Setting Validation
0 to 50
(0 to 500 ms)
10 ms
0
Immediately
• 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. By using this
parameter to delay turning the servo OFF, this slight shift can be
eliminated.
• This parameter changes the brake ON timing while the servomo-
tor is stopped.
For details on brake operation while the servomotor is operating,
refer to
(5) Setting the Brake ON Timing When Servomotor Run-
ning
in this section.
IMPORTANT
The servomotor will turn OFF immediately when an alarm occurs, regardless of the setting of this parameter.
The machine movable part may shift due to gravity or external force during the time until the brake operates.
Speed
Position
Torque
/S-ON
(CN1-40)
/BK output
Power to motor
Brake released
Servo ON
Power to motor
Brake held
Servo OFF
No power to motor
Pn506
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