LI5X Process & Temperature Meter Instruction Manual
16
Signal Connections
Signal connections are made to a five-terminal connector labeled
SIGNAL on Figure 2. The COM (common) terminal is the return for all
types of input signals.
Current and Voltage Connections
The following figures show examples for current and voltage connections.
There are no switches or jumpers to set up for current and voltage inputs.
Setup and programming is performed through the front panel buttons.
COM
mA+
2
1
3
5
4
V+
T+
EXC
External
Power
Supply
2-Wire
4-20 mA
Transmitter
-
+
+ -
SIGNAL CONNECTOR
COM
SIGNAL CONNECTOR
mA+
2
1
3
5
4
V+
T+
EXC
2-Wire 4-20 mA
Self-Powered
Transmitter
-
+
Figure 4. Transmitter Powered by Ext. Supply or Self-Powered
COM
SIGNAL CONNECTOR
mA+
2
1
3
5
4
V+
T+
EXC
2-Wire
4-20 mA
Transmitter
-
+
P+
P-
2
1
24V OUT
COM
SIGNAL CONNECTOR
mA+
2
1
3
5
4
V+
T+
EXC
3-Wire
4-20 mA
Transmitter
Signal
+
2
1
24V OUT
-
P+
P-
Figure 5. Transmitters Powered by Internal Supply (Optional)
The current input is protected against current overload by a resettable
fuse. The display may or may not show a fault condition depending on
the nature of the overload.
The fuse limits the current to a safe level when it detects a fault condi-
tion, and automatically resets itself when the fault condition is removed.
Spec Tech Industrial Electric
www.spectechind.com
888-773-2832
Spec Tech Industrial Electric
www.spectechind.com
888-773-2832
