YOKOGAWA CW140, User Manual, Page: 71 / 292

7-19
IM CW140-E
Common Functions of All Modes
7
7.7 Scaling Function (VT/CT)
If your system has an external VT (Voltage Transformer) or CT (Current
Transformer) and uses its secondary output as an input, the scaling function
can be used to display the primary value of VT or CT after calculation by
setting VT ratio and CT ratio.
Default value: VT ratio: 1
CT ratio: 1
Setting Range
VT ratio 1 to 10000
CT ratio 0.01 to 10000
Example:
If VT: 2200 V → 110 V (20 : 1) then set VT ratio to 20.
If CT: 100 A → 5 A (20 : 1) then set CT ratio to 20.
Display Value
Voltage: Voltage range × VT ratio
Current: Current range × CT ratio
Power: Rated power × VT ratio × CT ratio
If VT or CT ratio is set to a value other than 1, the mark is displayed in
the upper-left corner of the screen.
SEE ALSO
For the settings of VT and CT ratios, see page 1/2 of the system setting screen, p. 5-2, or the last page
of setup screen in each measurement mode:
Instant mode: p. 8-13
Electric energy mode: p. 9-11
Demand mode: p. 11-12
Harmonics mode: p. 12-12