3 .3
Input/output connectors
The diagram shows the input/output connectors for the LD4-LN. The
input signal connection is between INPUT + and INPUT -. The standard 18VDC
unregulated transmitter supply output is between INPUT - and EXCITATION UN
REG. The optional 24VDC (±12V) transmitter supply output is between COM,
EXCI and EXCITATION -. Wires of up to 1.5mm diameter can be
accepted. The connectors are of the plug in type for ease of installation.
Connection examples
1.
4 wire ±20mA or 4-20mA input - externally powered sensor
2.
3 wire ±20mA or 4-20mA input - externally powered sensor, common negative
3.
2 wire ±20mA or 4-20mA input - externally powered sensor
Page 7 of 46
LD4LNMAN-1.0-1
-
-
UN
REG
COM
INPUT EXCITATION
+
+
PLUG IN
AFTER
WIRING
INPUT
+
+
+
-
-
-
18VDC
UNREGULATED
TRANSMITTER
SUPPLY
COM
OPTIONAL
TRANSMITTER
SUPPLY
-
-
UN
REG
COM
INPUT EXCITATION
+
+
PLUG IN
AFTER WIRING
SENSOR
External Power
Input
+
+
-
-
Shield
-
-
UN
REG
COM
INPUT EXCITATION
+
+
SENSOR
External Power
Input
+
+
-
-
PLUG IN
AFTER WIRING
Shield
-
-
UN
REG
COM
INPUT EXCITATION
+
+
SENSOR
External Power
Input
+
+
-
-
PLUG IN
AFTER WIRING
Shield
