4.7 Safety Function
4-57
4
Ope
rat
ion
(5) Connection Example and Specifications of Input Signals (HWBB Signals)
The input signals must be redundant. A connection example and specifications of input signals (HWBB sig-
nals) are shown below.
Connection Example
Specifications
The input signals (HWBB signals) have the following electrical characteristics.
If the HWBB function is requested by turning OFF the /HWBB1 and /HWBB2 input signals on the two chan-
nels, the power supply to the servomotor will be turned OFF within 20 ms (see below).
Note 1. The OFF status is not recognized if the total OFF time of the /HWBB1 and /HWBB2 signals is 0.5 ms or shorter.
2. The status of the input signals can be checked using monitor displays. Refer to
7.5 Monitoring Safety Input Sig-
nals
.
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 fol-
lows:
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 cur-
rent flows into the signal line.
Type
Signal
Name
Connector
Pin Number
Setting
Meaning
Input
/HWBB1
CN8-4
CN8-3
ON (closed)
Does not use the HWBB function. (normal operation)
OFF (open)
Uses the HWBB function. (motor current shut-off
request)
/HWBB2
CN8-6
CN8-5
ON (closed)
Does not use the HWBB function. (normal operation)
OFF (open)
Uses the HWBB function. (motor current shut-off
request)
/HWBB1+ 4
3
6
5
/HWBB1-
/HWBB2+
/HWBB2-
0 V
CN8
24-V power
supply
Fuse
Switch
SERVOPACK
Use a switch
that has micro-current
contacts.
Items
Characteristics
Remarks
Internal Impedance
3.3 k
Ω
−
Operation Movable Volt-
age Range
+11 V to + 25 V
−
Maximum Delay Time
20 ms
Time from the /HWBB1 and /HWBB2 signals are OFF to
the HWBB function operates.
/HWBB1
/HWBB2
Normal operation
SERVOPACK
State
HWBB state
ON
(Normal operation)
OFF (Motor current
shut-off request)
Within 20 ms
