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.
The brake has the following operation delay times:
• Brake release time: The time from when the brake (/BK) signal is turned ON to when the brake actually
releases.
• Brake operation time: The time from when the brake (/BK) signal is turned OFF to when the brake is actu-
ally applied.
Set the operation ON and OFF timing as shown below while taking into consideration the brake operation
delay times.
∗1. The brake operation delay times for servomotors with holding brakes are given in the following table. The table gives
typical operation delay times for when the power supply is switched on the DC side. Always evaluate performance
on the actual equipment before actual operation.
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.
*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
Servo OFF
OFF
OFF
Servo OFF
OFF
OFF
Servo ON
ON
ON
Brake release Brake applied
Brake applied
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