Kentec Electronics Sigma A-CP - Page 103

The figure below illustrates an example circuit for determining maximum wire length where values are
provided for minimum operating-voltage of the NAC channel output (V
NAC
-
min
), maximum current of
the circuit (I
max
), wire-resistance-per-foot of the circuit (R
wire
) and maximum current-draw of the
strobe (I
strobe
):
Figure C- 1
Example Circuit for Determining Maximum Wire Length
Supervised
EOL resistor
10K
EOL resistor
V
min
L
max
= 249 FT
+
+
+
+
.209 A
I
strobe
.209 A
I
strobe
.209 A
I
strobe
-
+
-
+
-
+
Example circuit identifies wire
length for two conductor cable
V
NAC
-
min
measured
across NAC1 terminals
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