3-16 IM 760301-01E
Wiring Example of a Three-Phase, Three-Wire System (3P3W)
If four input elements are available, two three-phase, three-wire systems can be set up
(elements 1 and 2 and elements 3 and 4).
±
±
R
ST
SOURCE
LOAD
SOURCE
Input terminal 1
LOAD
Input terminal 2
I1
I2
U1
U2
I
I
U
U
±
±
R
S
T
I
±
U
±
I
±
U
±
Wiring Example of Three-Phase, Three-Wire (Three-Voltage, Three-Current System)
[3P3W (3V3A)]
If four input elements are available, one three-phase, three-wire system (three-voltage,
three-current system) can be set up (elements 1, 2, and 3 or elements 2, 3, and 4).
SOURCE
LOAD
±
I
±
I
R
S
T
±
U
U
±
U
±
I
SOURCE
Input terminal 1
LOAD
Input terminal 2
R
S
T
±
I1
I2
I3
U3 U1
U2
Input terminal 3
I
±
U
±
I
±
U
±
I
±
U
±
Wiring Example of a Three-Phase, Four-Wire System (3P4W)
If four input elements are available, one three-phase, four-wire system can be set up
(elements 1, 2, and 3 or elements 2, 3, and 4).
SOURCE
LOAD
±
I
±
I
R
S
T
±
U
U
±
U
±
I
N
SOURCE
Input terminal 1
LOAD
Input terminal 2
R
S
T
N
±
I1
I2
I3
U1
U2
U3
Input terminal 3
I
±
U
±
I
±
U
±
I
±
U
±
Note
For the relationship between the wiring systems and the method of determining the measured
values or computed values, see Appendix 1, “Symbols and Determination of Measurement
Functions.”
3.9 Wiring the Circuit under Measurement for Direct Input
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