7-3
167646-1CD
HW1481264
7
Contact I/O Circuit
7.2 Contact Input Circuit
Interface Board for Welding
Power Supply
7.2
Contact Input Circuit
The contact input circuit includes 4 welding power source specific inputs
(gas shortage, wire shortage, arc establishment, arc failure).
Fig. 7-2: Example connection
Number of inputs and
application
4 inputs GASOF
WIRCUT
ARCOF
ARCACT
Gas shortage detection signal
Wire shortage detection signal
Arc failure detection signal
Arc start detection signal
Input method
Sink/Source switching available
Insulation method
Insulation by photocoupler
Input current per point
6.9 mA (Type) (6.1 mA to 7.8 mA)
Number of commons
No common connection.
Independent for each output.
Active level of the signal
Contact ON = "0", Contact OFF = "1"
Input threshold
8.8 V (Type) (6.3 V to 11.4 V)
Input delay
Ton = 850
μ
s + communication cycle
1)
Toff = 958
μ
s + communication cycle
1)
1 The communication cycle depends on the communication cycle setting of the
master side.
YEW01 side
+24V/+24VU
024V/024VU
FG
Input circuit
FG
i
i
* Connect as indicated in (1) or (2).
0.1μF
0.1μF
(1)
(2)
i : "Input current per point" as cited in the table
NOTE
The contact input circuit is provided with a capacitor of
0.1
μ
F as a noise control. When the input signal is ON,
large inrush current flows. Therefore, when the current
capacity of the input circuit is small, current limit measures
such as installing resistors in series are required.
37 of 40
