YOKOGAWA WT1800 User Manual page 49

2.10 Wiring the Circuit under Measurement When Using Current Sensors
The following wiring examples are for connecting shunt-type current sensors. When connecting a
clamp-type current sensor that outputs voltage, substitute shunt-type current sensors with clamp-type
current sensors.
Shunt-type current sensor
I
OUT H
The wiring examples shown below are examples of the following wiring systems in which the specified
input elements have been wired. To wire other input elements, substitute the numbers in the figures
with the appropriate element numbers.
• Single-phase, two-wire system (1P2W): Input element 1
• Single-phase, three-wire system (1P3W) and three-phase, three-wire system (3P3W): Input
elements 1 and 2
• Three-phase, three wire system that uses a three-voltage, three-current method (3P3W; 3V3A) and
three-phase, four-wire system (3P4W): Input elements 1 to 3
Wiring Example of a Single-Phase, Two-Wire System (1P2W) with
a Shunt-Type Current Sensor
SOURCE
Shunt-type current sensor
Earth
side
OUT L
Wiring Example of a Single-Phase, Three-Wire System (1P3W)
with Shunt-Type Current Sensors
SOURCE
OUT H
N
2-20
±
OUT L
U
±
EXT
Input element
±
I
OUT H
U
±
Input element 1
I
±
OUT L
U
±
Input element 1
Clamp-type current sensor
that outputs voltage
Input element
LOAD
EXT
I
OUT H
EXT
U
±
EXT
±
OUT L
U
±
EXT
Input element 2
LOAD
IM WT1801-03EN