Measurement Of Electrical Amounts In Main Circuit - IMO Jaguar CUB Instruction Manual

Compact inverter
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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
Electric
power
Power
factor
=
3
×Voltage
(V)×Curren
Table 7.3 Meters for Measurement of Main Circuit
Input (power supply) side
Voltage
Current
Ammeter
Voltmeter
Wattmeter
A
, A
, A
V
, V
, V
R
S
T
R
S
T
Rectifier or
Moving iron
Digital power
moving iron
type
type
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.
Single-phase input
(W)
×
100
%
Power
factor
=
t
(A)
Output (motor) side
Voltage
Current
Ammeter
Voltmeter
W
, W
A
, A
, A
V
, V
, V
R
T
U
V
W
U
V
W
Digital power
Digital power
meter
meter
meter
Figure 7.1 Connection of Meters
7-6
Electric
power
(W)
×
100
%
Voltage
(V)×Curren
t
(A)
DC link circuit
voltage
(P (+)-N (-))
Wattmeter
DC voltmeter
W
, W
V
U
W
Digital power
Moving coil type
meter

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