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10 Maintenance and Inspection
Measure-
ment item
Power supply
current
I
IN
Input electric
power
W
IN
Input power
factor
Pf
IN
Output volt-
age
E
OUT
Output cur-
rent
I
OUT
Output power
W
OUT
Output power
factor
Pf
OUT
Note 1. For the output voltage, use a measuring instrument that shows effective values of fundamental wave.
For the current and the electric power, use a measuring instrument that shows all effective values.
Note 2. The output waveform of the inverter has a margin of error, especially at low frequencies, because it was
generated under PWM control. Note that many general-purpose testers may not be usable due to noise.
10-8
Measurement point
Measuring instrument
Current in L1/R, L2/S,
L3/T (I
), (I
), (I
)
R
S
T
Between L1/R and
L2/S (W
)
I1
Between L2/S and
L3/T (W
)
I2
Between L3/T and
L1/R (W
)
I3
Calculate this from the measured values of power supply voltage E
power supply current I
, and input electric power W
IN
Between U and V
(E
)
U
Between V and W
(E
)
V
Between W and U
(E
)
W
Current of U, V and W
(I
), (I
), (I
)
U
V
W
Between U and V
(W
)
O1
Between V and W
(W
)
O2
Calculate this from the measured values of output voltage E
put current I
, and output electric power W
OUT
Remarks
All effective
values
Moving iron ammeter
All effective
values
Electrodynamic watt-
meter
.
IN
Effective val-
ue of funda-
Refer to the figure on
mental wave
the next page, or rec-
tifier type voltmeter.
All effective
values
Moving iron ammeter
All effective
values
Electrodynamic watt-
meter
OUT
.
OUT
M1 Series Standard Type User's Manual (I669)
Measurement value
reference
When input current is
not balanced:
I
= (I
+I
+I
)/3
IN
R
S
T
Three-wattmeter
method
(W
) + (W
) + (W
I1
I2
I3
,
IN
-
-
-
Two-wattmeter meth-
od (or three-wattme-
ter method) (W
) +
O1
(W
)
O2
, out-
-
)
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