Yaskawa Sigma-5 User Manual: Design and Maintenance - Rotary Motors - MECHATROLINK-II Communications Reference - Manual (Page 95)

4 Operation
4.3.4 Holding Brakes
4-10
4.3.4 Holding Brakes
A holding brake is a brake used to hold the position of the movable part of the machine when the SERVO-
PACK is turned OFF so that movable part does not move due to gravity or external forces. Holding brakes are
built into servomotors with brakes.
The holding brake is used in the following cases.
There is a delay in the braking operation. Set the following ON/OFF timing.
∗1. The operation delay time of the brake depends on the model. For details, refer to Brake Operation Delay Time shown
below.
∗2. After the SV_ON command has been sent and 50 ms has passed since the brake was released, output the reference
from the host controller to the SERVOPACK.
∗3. Use Pn506, Pn507, and Pn508 to set the timing of when the brake will be activated and when the servomotor power
will be turned OFF.
• The brake built into the servomotor with brakes is a de-energization brake, which is
used only to hold and cannot be used for braking. Use the holding brake only to hold
a stopped servomotor.
Servomotor
Vertical Shaft
Holding brake
Shaft with External Force Applied
Movable part of machine
Holding brake
Movable part of
machine
Servomotor
External
force
Prevents the movable part (table)
from moving due to external force.
Prevents the
movable part from
moving due to its
own weight when the
power is OFF.
Rotation
*1
*2
0
*1
*3
Servo ON command
(SV_ON)
Servomotor power
Brake signal (/BK)
Brake contact part
(lining)
Position reference/
Speed reference
Motor speed
OFF
OFF
OFF
OFF
OFF
OFF
ON
ON
ON
Brake release Brake applied Brake applied
MECHA