S-Rdy (Servo Ready Output) Signal; Bk (Brake Output) Signal; Stopping Methods - YASKAWA SGD7S series Product Manual

11.2 Hard Wire Base Block (HWBB)

11.2.7 /S-RDY (Servo Ready Output) Signal

11.2.7

/S-RDY (Servo Ready Output) Signal

The /S-ON (Servo ON) signal will not be acknowledged in the HWBB state. Therefore, the
Servo Ready Output Signal will turn OFF. The Servo Ready Output Signal will turn ON if both
the /HWBB1 and /HWBB2 signals are ON and the /S-ON signal is turned OFF (BB state).
An example is provided below for when the main circuit power supply is ON and the SEN signal
turns ON when there is no servo alarm. (An absolute encoder is used in this example.)
/HWBB1
/HWBB2
/ -ON
( ervo ON
Input ignal)
ERVOPACK
tatu
/ -RDY
( ervo Ready
Output ignal)

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.

11.2.9 Stopping Methods

If the /HWBB1 or /HWBB2 signal turns OFF and the HWBB operates, the Servomotor will stop
according to the stop mode that is set for stopping the Servomotor when the servo turns OFF
(Pn001 = n.X). However, if the dynamic brake is enabled (Pn001 = n.0 or
n.1), observe the following precautions.
11-6
OFF (motor current
ON (normal
hut-OFF reque t)
operation)
ON
Operating
HWBB tate
tatu
ON
 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.
 The dynamic brake is not a safety-related element. You must design the system so that a
hazardous condition does not occur even if the Servomotor coasts to a stop in the HWBB
state. Normally, we recommend that you use a sequence that returns to the HWBB state
after stopping for a reference.
 If the application frequently uses the HWBB, stopping with the dynamic brake may result in
the deterioration of elements in the SERVOPACK. To prevent internal elements from deterio-
rating, use a sequence in which the HWBB state is returned to after the Servomotor has
come to a stop.
ON (normal
operation)
OFF
BB tate
OFF
ON
CAUTION
CAUTION