Measurement Method Of I/O Voltage, Current, And Power - Omron RX2 Series User Manual

13 Maintenance and Inspection

13-5-4 Measurement Method of I/O Voltage, Current, and Power

The following shows general measurement instruments used for measurement of input/output voltage,
current, and power.
R
IR
Power
S
IS
supply
T
IT
Measure-
ment item
Power
Between R-S, S-T, and
supply
T-R
voltage
(E
E
R
IN
Power
Current of R, S, and T
supply
current
(I
R
I
IN
Power
Between R-S, S-T, and
from power
T-R
supply
(W
W
IN
This value is calculated using measurement values of
Power rate
power supply voltage E
of power
supply
power supply power W
P
fIN
Between U-V, V-W,
Output
voltage and W-U
E
(E
OUT
U
Output
Current of U, V, and W
current
(I
I
U
OUT
Output
Between U-V and V-W
power
(W
W
OUT
This value is calculated using measurement values of
Output
output voltage E
power
power W
factor
P
fOUT
13 - 12
R
WI1
Inverter
ER
S S
WI2
ES
T
WI3
ET
Measurement
Target section
instrument
Moving iron voltmeter
), (E ), (E )
Rectifier type
S T
voltmeter
Moving iron ammeter
), (I ), (I )
T
S
Electrodynamome-
ter type wattmeter
)+(W )+(W )
I1 I2 I3
, power supply current I
IN
.
IN
P =
fIN
See the figure
below
), (E ), (E )
V W
Rectifier type voltmeter
Moving iron ammeter
), (I ), (I )
V W
Electrodynamome-
ter type
)+(W )
O1 O2
wattmeter
, output current I
OUT
.
OUT
P
fOUT
U
IU
EU
V
IV
EV
W
IW
EW
Remarks
All
or
effective
values
All
effective
values
All
effective
values
, and
IN
W
IN
× 100
√3
E I
∙ ∙
IN IN
Effective
value of
funda-
or
mental
wave
All
effective
values
All
effective
values
, and output
OUT
W
OUT
= × 100
√3 E I
∙ ∙
OUT OUT
High-function General-purpose Inverter RX2 Series User's Manual
U
WO1
V
Motor
W
WO2
Criteria
200 V class: 200-240 V 50/60 Hz
400 V class: 380-500 V 50/60 Hz
If input current is imbalanced
I =(I +I +I )/3
IN R S T
Three wattmeter method
Two wattmeter method
(or three wattmeter method)