YOKOGAWA WT110 User Manual page 55

IM 253401-01E
4.9 Computing the Efficiency (Applies to WT130 with ROM Version 2.01 or later)
Wiring Method and Computing Equation
• When the input and output are both two-wire
Select 1Φ2W, 1Φ3W, or 3Φ3W for the wiring method for the three-phase three-wire system
253502) and 1Φ2W for the wiring method for the three-phase four-wire system (253503).
Primary side
W1
Computing equation
Efficiency(µ) = (W3/W1)×100
• When the input is two-wire and the output is three-wire
Select 1Φ2W, 1Φ3W, 3Φ3W, or 3V3A for the wiring method. This only applies to model
253503.
Primary side
W2
Computing equation
Efficiency(µ) = {(W1+W3)/W2}×100
Secondary side
Converter
Output side
Secondary side
Converter
Output side
W3
W1
W3
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