Yaskawa Sigma-5 Large Capacity Users Manual: Design and Maintenance-Rotary Motors-Analog Voltage and Pulse Train Reference - Manual (Page 203)

5 Operation
5.11.1 Hard Wire Base Block (HWBB) Function
5-82
(2) Hard Wire Base Block (HWBB) State
The SERVOPACK will be in the following state if the HWBB function operates. If the /HWBB1 or /HWBB2
signal is OFF, the HWBB function will operate and the SERVOPACK will enter a hard wire baseblock
(HWBB) state.
(3) Resetting the HWBB State
Usually after the servo ON signal (/S-ON) is turned OFF, the SERVOPACK will then enter a hard wire base-
block (HWBB) state with the /HWBB1 and /HWBB2 signals turned OFF. By then turning the /HWBB1 and /
HWBB2 signals ON in this state, the SERVOPACK will enter a baseblock (BB) state and can accept the servo
ON signal.
If the /HWBB1 and /HWBB2 signals are OFF and the servo ON signal is ON, the HWBB state will be main-
tained after the /HWBB1 and /HWBB2 signals are turned ON.
Turn OFF the servo ON signal, and the SERVOPACK is placed in a BB state. Then turn ON the servo ON sig-
nal again.
Note 1. If the SERVOPACK is placed in a BB state with the main power supply turned OFF, the HWBB state will be
maintained until the servo ON signal is turned OFF.
2. The HWBB state cannot be reset if the servo ON signal is set to be constantly enabled in the servo ON signal
allocation (Pn50A.1). Do not make this setting if the HWBB function is being used.
(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
/S-ON
SERVOPACK
state
ON
ON (Normal operation)
OFF
HWBB state BB state Operating
OFF
(Motor current shut-off request)
Analog
/HWBB1
/HWBB2
/S-ON
OFF
(Motor current
shut-off request)
SERVOPACK
state
OFF
HWBB state BB state Operating
ON (Normal operation)
ON
Analog
/HWBB1
/HWBB2
/S-ON
SERVOPACK
state
ON ON
HWBB state BB state Operating
OFF
OFF
(Motor current
shut-off request)
ON (Normal operation)
Analog
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.