Omron RX Series - I;O Voltage;Current;Electric Power Measurement Method

11 Maintenance and Inspection
11 - 12
High-function General-purpose Inverter 3G3RX-V1 User's Manual (SBCE-367)
Measuring instruments commonly used for input/output voltage, current, or electric power
measurement are shown below.
11-3-4 I/O Voltage/Current/Electric Power Measurement Method
Measurement
item
Measurement point
Measuring
instrument
Remarks Measurement value reference
Power
supply
voltage E
IN
Between R/L1 and S/L2
(ER)
Between S/L2 and T/L3
(ER)
Between T/L3 and R/L1
(ER)
Moving-iron
voltmeter
or
rectifier type
voltmeter
All
effective
values
200-V class: 200 to 240 V, 50/60 Hz
400-V class: 380 to 480 V, 50/60 Hz
Power
supply
current I
IN
Current in R/L1, S/L2
T/L3: (I
R), (IS), (IT)
Moving iron
ammeter
All
effective
values
When input current is not balanced:
I
IN = (IR + IS + IT) / 3
Input
electric
power W
IN
Between R/L1 and S/L2
(W
I1)
Between S/L2 and T/L3
(W
I2)
Between T/L3 and R/L1
(W
I3)
Electrodynamic
wattmeter
All
effective
values
Three-wattmeter method
(W
I1) + (WI2) + (WI3)
Input power
factor PfIN
Calculate this from the measured values of power supply
voltage E
IN, power supply current IIN, and input electric
power W
IN.
–
Output
voltage
E
OUT
Between U/T1 and V/T2
(EU)
Between V/T2 and W/T3
(EV)
Between W/T3 and U/T1
(E
W)
Refer to the figure
on the next page.
or
rectifier type
voltmeter
Effective
value of
fundamental
wave
–
I R
I S
I T
ER
ET
ES
WI2
WI3
WI1
R
/
L1
U
/
T1
V
/
T2
W
/
T3
T
/
L3
S
/
L2
U
V
W
I U
I V
I W
EU
EW
EV
WO2
WO1
Motor
W
V
U R
S
T
Power
supply
Inverter
PfIN
=
W
IN
√3 · EIN · IIN
×100 [%]