Hard Wire Base Block (Hwbb) Function - YASKAWA SGLGW User Manual

4.2

Hard Wire Base Block (HWBB) Function

The Hard Wire Base Block function (hereinafter referred to as HWBB function) is a
safety function designed to baseblock the motor (shut off the motor current) by using
the hardwired circuits: Each circuit for two channel input signals blocks the run sig-
nal to turn off the power module, and the motor current is shut off. (Refer to the dia-
gram below.)
24-V power supply
Switch
Fuse
0 V
Note: For safety function signal connections, the input signal is the 0 V common and the output
signal is the source output. This is opposite to other signals described in this manual. To
avoid confusion, the ON and OFF status of signals for safety functions are defined as
follows:
ON: The state in which the relay contacts are closed or the transistor is ON and current
flows into the signal line.
OFF: The state in which the relay contacts are open or the transistor is OFF and
no current flows into the signal line.
• Perform risk assessment for the system and confirm that the safety requirements
with the following standards are fulfilled before using the HWBB function.
EN954-1 Category3
IEC61508-1 to 4 SIL2
www.dadehpardazan.ir 88594014-15

4.2 Hard Wire Base Block (HWBB) Function

SERVOPACK
CN8
/HWBB1+ 4
/HWBB1-
3
/HWBB2+
/HWBB2-
5
WARNING
Power supply
Control
circuit
Block
Block
Power module
Motor
4
4-3