Holding Brake; Brake Operating Sequence; Bk (Brake) Signal - YASKAWA SGD7S-1R9D Product Manual

5.11 Holding Brake

5.11.1 Brake Operating Sequence

5.11

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.
Important

5.11.1 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.
Term
Position/speed 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.
5-32

Vertical Axis
Servomotor
Holding brake
Prevents the moving part from
falling due to gravity when the
power supply is 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.
Time Required to Release Brake
The time from when the /BK (Brake) signal is turned ON until the brake is actually released.
Time Required to Brake
The time from when the /BK (Brake) signal is turned OFF until the brake actually operates.
Controlword
Disable Operation
(6040 hex)
Statusword
Switched on
(6041 hex)
Power not supplied.
Motor power status
OFF

/BK (Brake) signal

Brake applied.
Brake contact section
(lining)
0
Motor speed

Shaft with External Force Applied
Moving part of machine
External force
Servomotor
Prevents the moving part from
moving due to an external force.
Enable Operation
Operation Enabled
Power supplied.
ON
Brake released.
*1
*2
Holding brake
Disable Operation
Switched on
Power not supplied.
*3
OFF
Brake applied.
*1