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6.9 Voltage Current Measurement
The voltage and current measurement on the primary and secondary side of the inverter may
be different due to instrumentation variations. Refer to following diagram for measurement:
Measurement
Measuring point
Instrument
NOTE
(Measurement criterion)
Input voltage
VI
Moving-iron
Input current
Ii
Moving-iron
Input power
Pi
Power-meter
P
=W1
Input power
factor
PFi
Calculate power factor by the input voltage, input current and input power
PFi=
Pi
3Vi • Ii
x 100%
Output voltage
Vo
Rectifier
(Moving-iron not allowed)
Maximum voltage
difference between wires
under 3%
Output Current
Io
Moving-iron
Under the inverter rated
current
Output power
Po
Power-meter
Po
=W3+W4
Output power
factor
PFo=
Po
3Vo • Io
x 100%
V1
A1
W1
V4
V5
V6
A4
A5
A6
W3
W4
A1
V1
W1
A4
A5
A6
V4
V5
V6
W3
W4
L1
(R)
L2
(
S
)
T1
(U)
T2
(V)
T3
(W)
S
ignal-pha
s
e
power
s
upply
To motor
Different
k
ind
s
of
in
s
trument
RVDF Advanced User Manual