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7.3 Setting the square-root extraction function
Set only for voltage or current input. Cannot be set for inverse scaling.
Enables you to make a signal with square characteristics, such as current measurement, linear.
Cannot be set for thermocouple or R.T.D. input.
Enabling square-root extraction function
Setting square-root extraction Sqr (screen 2-2) to ON enables the square-root extraction function.
Low cut
Functions when square-root extraction function is enabled only.
With square-root extraction, results fluctuate significantly due to slight fluctuation of input values near signal zero. Low cut is
a function that outputs zero for PV when below a preset input value. Prevents operation from becoming unstable when noise
gets in the input signal.
Low cut setting range is 0.0
−
5.0% of PV input range.
7.4 10-segment linear approximation
Enabling 10-segment linear approximation
Set only for voltage or current input. Ineffective during inverse scaling.
Function that makes a nonlinear PV input signal linear by linear approximation.
Cannot be set for thermocouple or R.T.D. input.
Curve point setting
Sets curve point for linear approximation input clearance.
You can set up to 11 points. Set 11 points (A1
−
A11) for PV input (%) and 11 points (B1
−
B11) for PV display (%).
Curve points B1 for A1, B2 for A2, up to B11 for A11; linear interpolation is executed among the various curve points.
Setting example
The following figure gives an example where 4 curve points are set for A1, B1
−
A6 , up to B6. The inclinations of (A1, B1)
−
(A2, B2) and (A5, B5)
−
(A6, B6) were previously applied to A6 and subsequent. Set so An < A (n + 1).
If An
≧
A(n + 1), A (n + 1) and subsequent is invalid.
Note
• Will not operate with A1/B1 setting alone.
When using linear approximation, set at least 2 points.
