Holding Brakes - YASKAWA SGDV User Manual

5.2.4 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.
Servo ON signal
(/S-ON)
Servomotor power
Brake signal (/BK)
Brake contact part
(lining)
Position reference/
Speed reference
Motor speed
∗1. The delay time in brake operation is given in the following table. This is just example of the operation delay time for
switching with a direct current. Always evaluate performance on the actual equipment before actual operation.
Model
SGMMV
∗2. After the/S-ON signal has turned ON 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.
Vertical Shaft
Servomotor
Holding brake
Prevents the
movable part from
moving due to its
own weight when the
power is OFF.
Movable part of
machine
• 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.
OFF ON
OFF ON
OFF ON
Brake applied Brake release
*1
0V
*2
Voltage
24 VDC
Shaft with External Force Applied
Movable part of machine
External
force
Servomotor
Prevents the movable part (table)
from moving due to external force.
OFF
OFF
*3
OFF
Brake applied
*1
Brake Release Time (ms)
40
5.2 Basic Functions Settings
Holding brake
Analog
Brake Applied Time (ms)
100
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