7-6
7.3 Measurement of Electrical Amounts in Main Circuit
Because the voltage and current of the power supply (input) of the main circuit of the inverter and the
output (motor) include harmonic components, the indicated value deviates according to the type of
the meter. Use meters indicated in Table 7.3 when measuring with meters for commercial
frequencies.
The power factor cannot be measured by a commercially available power-factor meter that
measures the phase difference between the voltage and current. To obtain the power factor,
measure the power, voltage and current on each of the input and output sides and calculate in the
following formula.
Three-phase input
Single-phase input
%
100
×
(A)
t
(V)×Curren
×Voltage
3
(W)
power
Electric
=
factor
Power
%
100
×
(A)
t
(V)×Curren
Voltage
(W)
power
Electric
=
factor
Power
Table 7.3 Meters for Measurement of Main Circuit
Ite
m
Input (power supply) side
Output (motor) side
DC link circuit
voltage
(P (+)-N (-))
Wa
ve
fo
rm
Voltage
Current
Voltage
Current
Na
m
e
o
f
me
te
r
Ammeter
A
R
, A
S
, A
T
Voltmeter
V
R
, V
S
, V
T
Wattmeter
W
R
, W
T
Ammeter
A
U
, A
V
, A
W
Voltmeter
V
U
, V
V
, V
W
Wattmeter
W
U
, W
W
DC voltmeter
V
Ty
pe
of
meter
Moving iron
type
Rectifier or
moving iron
type
Digital power
meter
Digital power
meter
Digital power
meter
Digital power
meter
Moving coil type
Symbol
of
meter
When the output voltage is measured by a rectifier type voltmeter, an error may be included
or the voltmeter might be burn out. To measure it with higher accuracy, use a digital AC
power meter.
Figure 7.1 Connection of Meters
Содержание Jaguar CUB
Страница 47: ...3 5 Figure 3 2 Alarm Mode Status Transition...
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Страница 78: ...5 5 E codes Extension Terminal Functions...
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Страница 81: ...5 8 C codes Control Functions of Frequency...
Страница 84: ...5 11 y codes Link Functions...
Страница 149: ...8 5 8 3 Common Specifications...
Страница 150: ...8 6...
Страница 153: ...8 9 8 5 External Dimensions 8 5 1 Standard Models...
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Страница 155: ...8 11 8 5 2 Models Available on Order EMC Filter Built in Type...
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