YOKOGAWA WT1800 User Manual page 45

2.9 Wiring the Circuit under Measurement for Direct Input
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 systems (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
Note
The thick lines on the wiring diagrams are the parts where the current flows. Use wires that are suitable for
the current levels.
Wiring Examples of Single-Phase, Two-Wire Systems (1P2W)
If six input elements are available, six single-phase, two-wire systems can be wired. For information
about deciding which of the wiring systems shown below you should select, see section 2.7.
SOURCE
Input element 1
SOURCE
SOURCE
Input element 1
SOURCE
Wiring Example of a Single-Phase, Three-Wire System (1P3W)
If six input elements are available, three single-phase, three-wire systems can be wired.
SOURCE
N
Input element 1
(U1 and I1)
2-16
LOAD
U
±
I
±
U
U1
±
±
I
I1
LOAD
U
±
I
±
±
I
I1
U
U1
±
U
±
I
±
Input element 2
(U2 and I2)
SOURCE
Input element 1
SOURCE
LOAD
SOURCE
Input element 1
LOAD
SOURCE
LOAD
N
SOURCE
U
±
I
±
LOAD
U
±
I
±
U
U1
±
± I
I1
LOAD
U
±
I
±
±
I
I1
U
U1
±
±
I
I1
U
U1
±
±
U2
U
I2
±
I
LOAD
LOAD
LOAD
IM WT1801-03EN