Hyundai N700E, Instruction Manual, Page: 172 / 174

N700E INSTRUCTION MANUAL
4-7
4.3.4 General Inverter Electrical Measurements
The following table specifies how to measure key system electrical parameters.
The diagrams on the next page show inverter-motor systems the location of measurement points
for these parameters.
I
R
I
S
I
T
W
11
W
12
E
S
E
R
E
T
I
U
I
V
I
W
W
01
W
02
E
V-W
E
U-V
E
W-U
R
S
T
Power
Supply
U
V
W
R
S
T
U
V
W
I
N
V
E
R
T
E
R
Motor
Parameter
Circuit location
of measurement
Measuring instrument Notes
Reference
Value
Supply
voltageE
1
R-S, S-T, T-R
(E
R
) (E
S
) (R
T
)
Moving-coil type
voltmeter or rectifier
type voltmeter
Fundamental
AC Waveform
Commercial
supply voltage
(230V class)
200-220V 50Hz
200-240V 60Hz
(460Vclass)
380-415V 50Hz
400-480V 60Hz
Supply current
I
1
R, S, T, Current
(I
R
) (I
S
) (I
T
)
Moving-coil type
Ammeter
Total effective
value
Supply power
W
1
R-S, S-T
(W
11
) + (W
12
)
Electronic type
wattmeter
Supply power
factor
P
f1
Calculate the output power factor from the output voltage E
1
,
output current I
1
, and output power W
1
Output voltage
E
0
U-V, V-W, W-U
(E
U
) (E
V
) (E
W
)
Rectifier type voltmeter Total effective
value
PWM Output
Voltage
Output current
I
0
U, V, W Current
(I
U
) (I
V
) (I
W
)
Moving-coil type
Ammeter
Total effective
value
Output power
W
0
U-V, V-W
(W
01
) + (W
02
)
Electronic type
wattmeter
Total effective
value
Output power
factor
P
f0
Calculate the output power factor from the output voltage E
0
,
output current I
0
, and output power W
0
Note1: Use a meter indicating a fundamental wave effective value for voltage, and meters indicating total
effective values for current and power.
Note2: The inverter output has a PWM waveform, and low frequencies may cause erroneous readings.
However, the measuring instruments and methods listed above provide comparably accurate
results.
Note3: A general-purpose digital volt meter (DVM) is not usually suitable to measure a PWM waveform
(not pure sinusoid)