Omron 3G3JX

6-6
6-1 Inspection and Maintenance
6
Inspection and Maintenance
Note 1: For voltage, use a measurement device that displays effective values of fundamental wave. For current
and electric power, use a measurement device that displays all effective values.
Note 2: The Inverter output waveform, under PWM control, may have a margin of error, especially at a low
frequency.
Use the above measurement devices and methods to ensure accuracy.
Note 3: General-purpose testers are not applicable for measurement in many cases.
Input
power
factor
Pf
I
Calculated from the measured values of power supply voltage E
I
, power
supply current I
I
, and input electric power W
I
.
Output
voltage
E
O
Between U-V, V-W, W-U
(EU) (EV) (EW)
Rectifier voltmeter
All effective
values
Output
current
I
O
Current U, V, W
(IU) (IV) (IW)
Moving-iron voltmeter
All effective
values
Output
electric
power
W
O
Between U-V, V-W
(W
01) + (W02)
Electrodynamic wattmeter
All effective
values
Two-wattmeter method
Output
power
factor
Pf
O
Calculated from the measured values of output voltage E
O
, output current I
O
,
and output electric power W
O
.
Measurement
item
Measurement point Measurement device Note
Measurement value
reference
3
Pf
I
=
E
I
I
I
W
I
× 100 (%)
3
Pf
o
=
E
o
I
o
W
o
× 100 (%)