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7.3 Measurement of Electrical Values in Main Circuit
Because the voltage and current of the power supply (input) of the main circuit of the drive and the output (motor)
include harmonic components, the indicated values vary according to the type of meter used to measure them. Use
meters indicated in Table 7.3 when measuring 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 using the following formula.
• 3-phase input
• 1-phase input
Table 7.3 Meters for Measurement of Main Circuit
Item
Input (power supply) side
Output (motor) side
Intermediate dc
circuit voltage
(P (+)-N (-))
waveform
Voltage
Current
Voltage
Current
Name of meter
Ammeter
AR, AS, AT
Voltmeter
VR, VS, VT
Wattmeter
WR, WT
Ammeter
AU, AV, AW
Voltmeter
VU, VV, VW
Wattmeter
WU, WW
DC voltmeter
V
Type 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
–
–
–
–
NOTE: When output voltage is measured by a rectifier type voltmeter, errors may be occur or the voltmeter may burn
out. To measure with higher accuracy, use a digital ac power meter.
Figure 7.1 Connection of Meters
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