10.3 Functions Specifications
200
4.Calculation Functions
(1) Rectification System
Function Select which voltage and current values to used for calculating apparent and reactive power, and
power factor
Method rms/mean (voltage and current in each phase system)
(2) Scaling
VT (PT) ratio OFF/0.01 to 9999.99 (Settings for which VT×CT exceeds 1.0E+06 are disallowed.)
CT ratio OFF/0.01 to 9999.99 (Settings for which VT×CT exceeds 1.0E+06 are disallowed.)
Display VT or CT indicator is displayed when scaling.
(3) Average
Function Averages all instantaneous measurement values including harmonics (but not peak, integration, or
FFT noise values).
When averaging is enabled, the averaged data is saved.
Method Indexed average (applied at 50 ms data update intervals)
Averaged voltage (U), current (I), and power (P) values are used for calculations.
rms values are averaged for harmonic amplitude, and instantaneous values are averaged for relative
harmonic content.
Phase angle is calculated from the average real and imaginary components after FFT.
Phase difference, distortion and imbalance are calculated from the above data after averaging.
Ripple factor is calculated from averaging the differences in peak values.
Response speed OFF/FAST/MID/SLOW/SLOW2/SLOW3
(time remains within specified accuracy when input changes from 0 to 100% f.s.)
Corresponding response times are 0.2 s/1.0 s/5 s/25 s/100 s
Display The AVG indicator is displayed when averaging is enabled.
(4) Efficiency and Loss Calculations
Function Efficiency [%] and Loss [W] are calculated from active power values measured on each phase and
system.
Calculation items Active power (P) of each phase and system
Motor power (Pm) when motor evaluation model PW3390-03 is installed
Calculation accuracy Measurements applied to formulas are handled as 32-bit floating point values.
When calculating parameters between wiring systems with different power ranges, the higher range
is used.
Calculation rate At every 50 ms data update interval
When calculating between wiring systems having different sync sources, the most recent data is
used at calculation time.
Maximum no. of simultaneous
calculations
Efficiency and loss, by three formulas
Calculation method Parameters specified for P
in
and P
out
are applied as follows
= 100 × |Pout|/|Pin|, Loss = |Pin| - |Pout|
(5) - Y Calculation
Function For 3P3W3M systems, converts between line-to-line voltage and phase voltage waveforms using a
virtual center point. All voltage parameters including harmonics such as true rms voltage are calcu-
lated as phase voltage waveforms.
Calculation method U1s = (U1s-U3s)/3, U2s = (U2s-U1s)/3, U3s =U3s-U2s)/3
(6) Selecting the Calculation Method
Function Select the calculation method used to calculate the apparent power and reactive power during
3P3W3M wiring.
Only affect measurement values S123, Q123, 123, 123
Calculation method TYPE1/TYPE 2 (only valid when wiring is 3P3W3M)
(7) Current sensor phase correction calculations
Function Compensation by calculating the current sensor’s harmonic phase characteristics
Operating modes OFF/ON (set separately for each wiring mode)
Configuration of corrected values Correction points are set using frequency and phase difference (set separately for each wiring
mode).
Frequency: 0.001 kHz to 999.999 kHz (in 0.001 kHz increments)
Phase difference: 0.00° to ±90.00° (in 0.01° increments)
However, the time difference calculated from the frequency phase difference is limited to a maximum
of 200
s in 5 ns increments.
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