Holding Brake; Brake Operating Sequence - YASKAWA SGD7S Product Manual

5.13

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 Axis
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.
Important
5.13.1

Brake Operating Sequence

You must consider the time required to release the brake and the time required to brake to
determine the brake operation timing, as described below.
Time Required to Release Brake
The time from when the /BK (Brake) signal is turned ON until the brake is actually released.
Term Time Required to Brake
The time from when the /BK (Brake) signal is turned OFF until the brake actually operates.
/S-ON (Servo ON) signal
Motor power status
/BK (Brake) signal
Brake contact section
Position/speed reference
Motor speed
Shaft with External Force Applied
Servomotor
External force

Holding brake

Prevents the moving part from
falling due to gravity when the
power supply is OFF.
Moving part of machine
OFF
Power not
supplied.
OFF
Brake applied.
(lining) *1
0
*2
Moving part of machine
Servomotor
Holding brake
Prevents the moving part from
moving due to an external force.
ON OFF
Power not supplied.
Power supplied.
*3
ON
OFF
Brake released. Brake applied.
*1
5.13 Holding Brake

5.13.1 Brake Operating Sequence

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