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8-5
8 Maintenance and Inspection
FVR-C11S-EN
8
Table 8-3-1
Meter for measuring the main circuit
1) When measuring the output voltage by rectifier type meter, an error may occur.
Use a digital AC power meter for good accuracy.
8-3 Electrical
measure-
ments in the
Main Circuit
The indicated values depend on the meter types because of harmonic
components included in the voltage and current of the main power sup-
ply (input) and the output (motor) side of the inverter. Therefore, when
measuring with a meter for the commercial power frequency, use the
meters shown in Table 8-3-1.
The power-factor cannot be measured using the power-factor meter
available on the market which measures the phase difference between
voltage and current. When the power-factor must be measured, meas-
ure the power, voltage, and current on the input side and output side.
Then, calculate the power-factor using the following formulas:
Single-phase
Electric power [W]
Power factor =
x 100 [%]
Voltage [V] x Current [A]
Item
Input (power supply) side
Output (motor) side
DC circuit
Voltage
waveform
Current
waveform
Voltage
waveform
Current
waveform
P(+), N(-)
FM, 11
Terminal
section
Meter
name
Ammeter
A
R
Voltmeter
V
R
Wattmeter
W
R
Ammeter
A
U,V,W
Voltmeter
V
U,V,W
Wattmeter
W
U,W
DC
voltmeter
V
Meter
type
Moving-
iron type
Rectifier
or
moving-
iron type
Power
meter
Moving-
iron type
Rectifier
type
1)
Power
meter
Moving-
coil type
Symbol
-
-