YASKAWA SGMPS - Holding Brakes

5 Operation
5.2.4 Holding Brakes
5-8
• A servomotor under torque control cannot be decelerated to a stop. The servomotor is stopped with the
dynamic braking (DB) or coasts to a stop according to the setting of Pn001.0. After the servomotor stops,
the servomotor will enter a coast state.
• For details on stopping methods after the /S_ON (Servo ON) signal turns OFF or an alarm occurs, refer to
5.2.5 Stopping Servomotors after /S_ON Turned OFF or Alarm Occurrence.
 When Motor Stopping Method is Set to Decelerate to Stop
Emergency stop torque can be set with Pn406.
• The setting unit is a percentage of the rated torque.
• The factory setting is 800% so that the setting is large enough a value to operate the servomotor at maximum
torque. The maximum value of emergency stop torque that is actually available, however, is limited to the
maximum torque of the servomotor.
5.2.4 Holding Brakes
A holding brake is a brake used to hold the position of the SERVOPACK when the SERVOPACK is turned
OFF so that movable parts do not move due to their own weight or external forces. Holding brakes are built
into servomotors with brakes.
The holding brake is used in the following cases.
Pn406
Emergency Stop Torque
Classification
Setting Range Setting Unit Factory Setting When Enabled
0 to 800 1% 800 Immediately Setup
Speed
Position
• 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 motor.
• Turn OFF the servomotor power and activate the holding brake at the same time.
Servomotor

Vertical Shaft
Holding brake
Prevents the servomotor
from rotating when
the power is OFF.

Shaft with External Force Applied
Movable part of machine
Holding brake
Movable part of
machine
Servomotor
External
force
Prevents the servomotor from
rotating due to external force.