Omron RX Series - Page 607

11 - 13
11 Maintenance and Inspection
High-function General-purpose Inverter 3G3RX-V1 User's Manual (SBCE-367)
11-3 Test Methods
11
11-3-4 I/O Voltage/Current/Electric Power Measurement Method
Note 1 For the output voltage, use a measuring instrument that shows effective values of fundamental wave. For
the current and the electric power, use a measuring instrument that shows all effective values.
2 The output waveform of the inverter has a margin of error, especially at low frequencies, because it was
generated under PWM control. Note that many general-purpose testers may not be usable due to noise.
3 In case that you find any problems during inspection, contact your OMRON sales representative.
<Output Voltage Measurement Method>
Output
current IOUT
Current in U/T1, V/T2,
W/T3
(I
U), (IV), (IW)
Moving iron
ammeter
All
effective
values
–
Output
power
W
OUT
Between U/T1 and V/T2
(W
O1)
Between V/T2 and W/T3
(W
O2)
Electrodynamic
wattmeter
All
effective
values
Two-wattmeter method (or
three-wattmeter method)
(W
O1) + (WO2)
Output
power
factor Pf
OUT
Calculate this from the measured values of output voltage
E
OUT, output current IOUT, and output electric power WOUT.
–
Measurement
item
Measurement point
Measuring
instrument
Remarks Measurement value reference
Pf OUT
=
W
OUT
√3 · E OUT · I OUT
×100 [%]
Diode
600 V 0.1 A min. (200-V class)
1000 V 0.1 A min. (400-V class)
R
/
L1
T
/
L3
S
/
L2
U
/
T1
V
/
T2
W
/
T3
Motor
Moving coil type
300 V (200-V class)
600 V (400-V class)
Effective value of fundamental wave VAC
Inverter
=1.1×VDC
+
–
2 W 220 kΩ
VAC
VDC