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4-20 mA Output Loop-powered Wiring
(Factory Setting)
The 4-20 mA output is factory set for loop-powered operation and
requires a power source of 12 Vdc to 30 Vdc. The overall permitted
impedance depends on the voltage supplied at the 4-20 mA loop. To
enable this configuration, the three jumpers must be placed on
positions 2-3, 4-5 and 6-7 at distinct outputs J16 through J23.
Voltage Source Applied
3-wire configuration
U31
1
J16
J17
+
-
+
+
511399
2/07
Permitted Impedance in the 4-20 mA Loop
12 Vdc
16 Vdc
20 Vdc
24 Vdc
30 Vdc
1
1
1
1
J19
J18
J20
-
-
+
+
-
+
-
OUTPUT 1 - 8
+
+
+
+
DDC System
420I User Manual
Honeywell
4-20 mA Output Loop-powered Wiring
Total Impedance
1
1
1
J21
J22
J23
+
-
-
-
+
+
+
+
+
Wiring Details
400 Ohms
600 Ohms
800 Ohms
1000 Ohms
1300 Ohms
J12
J8
RC
P.U.
P.D.
R
- V
B
A
V
SHIELD
-
-
DC Power Supply
+
+
17
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