6
Analog I/O Circuit
6.2 Analog Input Circuit
6-2
167646-1CD
HW1481264
Interface Board for Welding
Power Supply
6.2
Analog Input Circuit
Two analog input circuits (channel 1 for voltage feedback, and channel 2
for current feedback) are available.
Fig. 6-2: Example connection
NOTE
• The input voltage must be within -5 V to +5 V.
• Use shielded twisted-pair wires (24 to 28 AWG) for the
analog input wiring, and make the wiring length as short
as possible.
Number of channels and
application
2 channels for voltage output
Output range
-5 V to +5 V
Digital resolution
16 bit
LSB value
Approx. 153
μ
V (153 × 10
-6
V/bit)
D/A output voltage error
±0.5% full scale
Linearity error
±5LSB
Conversion cycle
Convert designated channel per every 2 ms.
Conversion time
1)
1 Includes the delay of 50
μ
s from the input to the A/D converter.
Maximum 60
μ
s
Input impedance
Equal to or more than 1 M
Ω
Input CH1
Input CH2
Switching signal
A/D conversion output
Filter
Filter
A/D
2-1
Selector
YEW01 side
0 V
(Analog ground)
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