Yaskawa Sigma-5 Large Capacity Users Manual: Design and Maintenance-Command Option Interface - Manual (Page 152)

4 Operation
4.7.1 Hard Wire Base Block (HWBB) Function
4-56
(3) Resetting the HWBB State
By turning ON a Servo ON command again after both /HWBB1 and /HWBB2 signals are turned ON, the
SERVOPACK returns to normal operation status.
If the /HWBB1 and /HWBB2 signals are OFF and the Servo ON command is turned ON, the HWBB state will
be maintained after the /HWBB1 and /HWBB2 signals are turned ON. Turn OFF the Servo ON command, and
the SERVOPACK is placed in a BB state. Then turn ON the Servo ON command again. For details on the
Servo ON command, refer to the manual of the connected command option module.
Note: Even if the servomotor power is turned OFF by turning OFF the main circuit power, the HWBB status is retained
until a Servo ON command is turned OFF.
(4) Error Detection in HWBB Signal
If only the /HWBB1 or /HWBB2 signal is input, an A.Eb1 alarm (Safety Function Signal Input Timing Error)
will occur unless the other signal is input within 10 seconds. This makes it possible to detect failures, such as
disconnection of the HWBB signals.
/HWBB1
/HWBB2
Motor power state Applied Not applied
(Normal operation)
( Requests motor
current shutoff.)
Reference from
option module [Servo ON command]
OFF
ON
SERVOPACK
state
HWBB state BB state Operation
CAUTION
• The safety function signal input timing error alarm (A.Eb1) is not a safety-related part of a control system. Keep this
in mind in the system design.