Holding Brake; Brake Operating Sequence - YASKAWA SGD7S series Product Manual

5.13 Holding Brake

5.13.1 Brake Operating Sequence

5.13

Holding Brake

A holding brake is used to hold the position of the moving part of the machine when the
SERVOPACK 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.
Important

5.13.1 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
/ -ON ( ervo ON) ignal
Brake contact ection
Po ition/ peed reference
*1.
Rotary Servomotors: The brake delay times 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 brake delay times on the actual equipment before using the applica-
tion.
5-36

Vertical Axi
ervomotor
Holding brake
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.
OFF
Power not
upplied.
Motor power tatu
OFF
/BK (Brake) ignal
Brake applied.
*1
(lining)
0
Motor peed

haft with External Force Applied
Moving part of machine
External force
ervomotor
Prevent the moving part from
moving due to an external force.
ON
Power upplied.
ON
Brake relea ed.
*1
*2
Holding brake
OFF
Power not upplied.
*3
OFF
Brake applied.