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5.12 Holding Brake
5.12.1 Brake Operating Sequence
5.12
Holding Brake
A holding brake is used to hold the position of the moving part of the machine when the SER-
VOPACK is turned OFF so that moving part does not move due to gravity or an external force.
You can use the brake that is built into a Servomotor with a Brake, or you can provide one on
the machine.
The holding brake is used in the following cases.
Vertical Axi
Important
5.12.1 Brake Operating Sequence
You must consider the brake release delay time and the brake operation delay time to deter-
mine the brake operation timing, as described below.
Term
/BK (Brake Output) ignal
Brake contact ection (lining)
Po ition/ peed reference
*1.
Rotary Servomotors: The times required to brake for Servomotors with Holding Brakes are given in the following
table. The operation delay times in the following table are examples for when the power supply is switched on
the DC side. You must evaluate the actual times required to brake on the actual equipment before using the
application.
5-32
haft with External Force Applied
ervomotor
Holding brake
External force
Prevent the moving
part from falling due to
gravity when the power
upply i OFF.
Moving part of machine
The brake built into a Servomotor with a Brake is a de-energization brake. It is used only to hold
the Servomotor and cannot be used for braking. Use the holding brake only to hold a Servomotor
that is already stopped.
Brake Release Delay Time
The time from when the /BK (Brake) signal is turned ON until the brake is actually released.
Brake Operation Delay Time
The time from when the /BK (Brake) signal is turned OFF until the brake actually operates.
ervo OFF
ervo ON/OFF tatu
Power not upplied.
Motor power tatu
OFF
Brake applied.
*1
0
Motor peed
Moving part of machine
ervomotor
Holding brake
Prevent the moving part from
moving due to an external force.
ervo ON
Power upplied.
ON
Brake relea ed.
*1
*2
ervo OFF
Power not upplied.
*3
OFF
Brake applied.
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