4-2 IM 760301-01E
Explanation
• Wiring System Pattern
• The five wiring systems below are available. Limitations are placed on the wiring systems
that can be selected depending on the number of input elements that are installed in the
instrument.
1P2W (single-phase, two-wire), 1P3W (single-phase, three-wire), 3P3W (three-phase,
three-wire), 3P4W (three-phase, four-wire), and 3P3W (3V3A, three-voltage, three-current)
• The input element assignment to wiring units ΣA and ΣB is determined from the
wiring system pattern. This allows Σ functions of voltage, current, active power,
apparent power, reactive power, power factor, phase difference, and other
parameters to be determined. For the relationship between the wiring system and
the determination of the Σ function, see appendix 1.
• The following table shows the relationship between the number of installed
elements, the selectable wiring system patterns, and the assignment of input
elements to wiring units ΣA or ΣB.
Installed input elements
Wiring system Pattern 1
1
1P2W
Installed input elements
Wiring system Pattern 1
Wiring system Pattern 2
1
1P2W
2
1P2W
1P3W or 3P3W: ΣA
Installed input elements
Wiring system Pattern 1
Wiring system Pattern 2
Wiring system Pattern 3
Wiring system Pattern 4
1
1P2W
2
1P2W
3
1P2W
1P2W
1P2W
1P2W
1P2W
1P3W or 3P3W(3V3A): ΣA
1P3W or 3P3W: ΣA
1P3W or 3P3W: ΣA
P3W or 3P3W: ΣB
1P3W or 3P3W: ΣA
1P3W or 3P3W(3V3A): ΣA
1P3W or 3P3W
3P4W or 3P3W(3V3A): ΣA
3P4W or 3P3W(3V3A): ΣA
3P4W or 3P3W(3V3A): ΣA
Installed input elements
Wiring system Pattern 1
Wiring system Pattern 2
Wiring system Pattern 3
Wiring system Pattern 4
Wiring system Pattern 5
Wiring system Pattern 6
Wiring system Pattern 7
1
1P2W
1P2W
1P2W
2
1P2W
1P2W
3
1P2W
1P2W
4
1P2W
1P2W
1P2W
Note
• Select the wiring system to match the circuit under measurement that is actually wired. The method in
which the Σ function is determined varies depending on the wiring system. If the selected wiring
system does not match the actual circuit, measurements and computation will not be correct.
• For the relationship between the wiring system and the determination of the Σ function, see
appendix 1.
4.1 Selecting the Wiring System
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