Measurement Method For I/O Voltage, Current, And Power; Parts To Be Measured - Hitachi J300 Series Instruction Manual
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10.3
Measurement Method for I/O Voltage, Current, and Power
General measuring instruments for I/O voltage, current, and power are indicated below. The
voltage to be measured is the fundamental wave effective voltage and the power to be meas-
ured is the total effective value.
(L1)
Power
(L2)
supply
(L3)
Measurement
item
Supply voltage
E
1
Supply current
I
1
Supply power
W
1
Supply power
factor
Pf
1
Output voltage
E
0
Output current
I
0
Output power
W
0
Output power
factor
Pf
0
NOTE 1: Use a meter indicating a fundamental wave effective value for voltage, and meters
NOTE 2: The inverter output waveform is a distorted wave, and low frequencys may cause
NOTE 3: A tester (general purpose) may not be suited often to measurement of a distorted
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R
I
R
E
S
I
S
E
T
I
T
E
T
Table 3 Parts to be measured
Parts to be
measured
Between R and S, S and
T, T and R (E
)(E
)(E
R
S
R, S, T (I
)(I
)(I
)
R
S
T
Between R and S, S and
T (W
)(W
)
11
12
Calculate the supply power factor from the measured supply voltage, E
supply current I
and supply power W
1
W
× 100 (%)
1
Pf
=
1
3 E
I
1
1
Between U and V, V and
W, W and U
(E
)(E
)(E
)
U
V
W
U, V, W (I
)(I
)(I
U
V
W
Between U and V, V
and W
(W
)(W
)
01
02
Calculate the output power factor from the output voltage E, output current I,
and output power W.
W
× 100(%)
0
Pf
=
0
3 E
I
0
0
indicating total effective values for current and power.
errors. However, the measuring instruments and methods indicated above provide
comparatively accurate values.
wave.
R
W
R
11
General
purpose
S
inverter
W
S
12
T
Measuring instrument
Moving-iron type
voltmeter or rectifier
)
T
type voltmeter
Moving-iron type
ammeter
Electrodynamic type
wattmeter
.
1
Rectifier type
voltmeter
)
Moving-iron type
ammeter
Electronic type
wattmeter
10-6
I
U
U
E
U-V
V
I
V
E
V-W
W
I
W
E
W-V
Remarks
Fundamental
wave effective
value
Total effective
value
Total effective
value
,
1
Total effective
value
Total effective
value
Total effective
value
U(T1)
W
01
V
Motor
(T2)
W
02
W
(T3)
Reference
value
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