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Measurement
Measurement point
item
Calculated from the measured values of power supply voltage E
Input
supply current I
power
factor
Pf
I
Output
Between U-V, V-W, W-U
voltage
(E
) (E
) (E
U
V
W
E
O
Output
Current U, V, W
current
(I
) (I
) (I
)
U
V
W
I
O
Output
electric
Between U-V, V-W
power
(W
) + (W
)
01
02
W
O
Calculated from the measured values of output voltage E
Output
and output electric power W
power
factor
Pf
O
Note 1: For voltage, use a measurement device that displays effective values of fundamental wave. For current
and electric power, use a measurement device that displays all effective values.
Note 2: The Inverter output waveform, under PWM control, may have a margin of error, especially at a low
frequency.
Use the above measurement devices and methods to ensure accuracy.
Note 3: General-purpose testers are not applicable for measurement in many cases.
Measurement device
, and input electric power W
I
W
I
×
Pf
=
I
E
I
3
I
I
Rectifier voltmeter
)
Moving-iron voltmeter
Electrodynamic wattmeter
.
O
W
×
o
Pf
=
o
E
I
3
o
o
6-1 Inspection and Maintenance
Note
, power
I
.
I
100 (%)
All effective
values
All effective
values
All effective
values
, output current I
O
100 (%)
Measurement value
reference
Two-wattmeter method
,
O
6-6
6
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