Yaskawa Sigma II Series Servo System - Manual (Page 152)

Sigma II User’s Manual Chapter 5: Parameter Settings and Functions
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5.4.4 Using the Holding Brake
The holding brake is used when a servodrive controls a vertical axis. In other words,
a servomotor with brake prevents the movable part from shifting due to the force of
gravity when system power goes OFF.
Note: The brake built into the servomotor SGM H 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
motor. Brake torque is at least 120% of the rated motor torque.
Holding brakes are generally used for vertical load applications or when an external
force must be applied to the shaft to prevent rotation due to gravity or another
external force. Incorrect wiring or application of abnormal voltage to the servo
amplifier output may cause damage to the amplifier and/or the machine. Therefore,
care must be exercised when wiring the holding brake circuit. Please observe the
following precautions and check the brake circuit wiring carefully.
Caution
• Faulty wiring or abnormal voltage may cause short-circuit failure in
the output circuit of the servo amplifier
• Short-circuit failure of the brake signal (/BK) could cause machine
break-down and/or physical injury.
• Check the wiring and perform trial runs with caution, especially with
vertical load applications, and be sure to follow appropriate safety
procedures
Servomotor
Prevents the movable part from
shifting due to gravity when
system power goes OFF.
Holding brake