General Inverter Electrical Measurements - Hyundai N700E Instruction Manual

N700E INSTRUCTION MANUAL

General Inverter Electrical Measurements

8.3
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.
Power
Supply
Parameter
Supply voltage
E
1
Supply current
I
1
Supply power
W
1
Supply power
factor
P
f1
Output voltage
E
0
Output current
I
0
Output power
W
0
Output power
factor
P
f0
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)
R
I
R
E
W
R
I
S
S
E
W
S
I
T
T
E
T
Circuit location
of measurement
R-S, S-T, T-R
(E ) (E ) (R )
R S T
R, S, T, Current
(I ) (I ) (I )
R S T
R-S, S-T
(W ) + (W )
11 12
Calculate the output power factor from the output voltage E
output current I , and output power W
1
U-V, V-W, W-U
(E ) (E ) (E )
U V W
U, V, W Current
(I ) (I ) (I )
U V W
U-V, V-W
(W ) + (W )
01 02
Calculate the output power factor from the output voltage E
output current I , and output power W
0
I
R U I
N
V
11
E
I
S V
R
T
12
E
I
T W
R
Measuring instrument
Moving-coil type
voltmeter or rectifier
type voltmeter
Moving-coil type
Ammeter
Electronic type
wattmeter
1
Rectifier type voltmeter
Moving-coil type
Ammeter
Electronic type
wattmeter
0
8-4
U
U
W
E
01
U-V
V
V
W
E
02
V-W
W
W
E
W-U
Notes
Fundamental
wave effective
value
Total effective
value
,
1
Total effective
value
Total effective
value
Total effective
value
,
0
Motor
Reference
Value
Commercial
supply voltage
(200V class)
200-220V 5Hz
200-240V 6Hz
(400Vclass)
380-415V 5Hz
400-480V 6Hz