Servo Ready; Bk (Brake Output) Signal - YASKAWA SGD7S Product Manual

11.2.7

Servo Ready

The Servo ON command (Enable = 1) signal will not be acknowledged in the HWBB state.
Therefore, the Servo Ready bit will be 0. The Servo Ready bit will change to 1 when both the
/HWBB1 and /HWBB2 signals are ON and the servo is OFF (BB state).
The following example is for when a servo alarm does not occur when the main circuit power
supply is turned ON.
/HWBB1
/HWBB2
Servo ON command
(Enable)
SERVOPACK
Status

Servo Ready

11.2.8

/BK (Brake Output) Signal

If the HWBB operates when the /HWBB1 or /HWBB2 signal is OFF, the /BK (Brake) signal will
turn OFF. At that time, the setting in Pn506 (Brake Reference - Servo OFF Delay Time) will be
disabled. Therefore, the Servomotor may be moved by external force until the actual brake
becomes effective after the /BK signal turns OFF.
 The brake signal is not a safety-related element. You must design the system so that a haz-
ardous condition does not occur even if the brake signal fails in the HWBB state. Also, if a
Servomotor with a Brake is used, keep in mind that the brake in the Servomotor is used only
to prevent the moving part from being moved by gravity or an external force and it cannot
be used to stop the Servomotor.
OFF (motor current
ON (normal
shut-OFF request)
operation)
1
(servo ON)
Operating
HWBB state
state
1 0
11.2 Hard Wire Base Block (HWBB)
ON (normal
operation)
0
(servo OFF)
BB state
1
CAUTION
11.2.7 Servo Ready
11
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