Response Electronics CL6011B Especificaciones descargar pdf (Pagina 34)

3Ć14 Theory of Operation: Point Processing

Original Ć June 1990CE4.2:CL6211

GF=1 GF=1

GF>1 GF>1

1>GF>0 1>GF>0

0% 100%Analog Variable

Figure 3Ć5. Process Variable Adaptive Gain

Deviation Adaptive Gain Ċ The deviation signal (the difference between

process variable and set point) may be used to modify the loop's active

gain. The operation of deviation adaptive gain is similar to that of

process variable adaptive gain except that the upper and lower break

points are used to divide the positive to negative deviation span into

three sections.

Analog Value Adaptive Gain Ċ The Analog Adaptive Gain Modifier

(AAGM) FST instruction allows an analog value to change the active gain

of the loop. The analog value is assumed to be in engineering units.

The analog value adaptive gain operates in the same manner as the

process variable adaptive gain. See page 4

29 for more information on

AAGM instruction.

Implied Valve Position Adaptive Gain Ċ The Implied Valve Position

(IVP) adaptive gain function will change the loop's active gain based on

the relationship of the IVP to the upper and lower break points and their

respective gain factors.

The IVP adaptive gain factor will assume one of three values; the upper

gain factor value, the lower gain factor value, or unity. The IVP adaptive

gain factor will be set equal to the upper gain factor when IVP exceeds

the upper break point. The IVP adaptive gain factor will be set equal to

the lower gain factor when IVP falls below the lower break point. The IVP

adaptive gain factor will be set equal to the unity gain when IVP is

between the upper and lower break points. Figure 3Ć6 on page 3Ć15

illustrates the operation of the IVP adaptive gain function.

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Response Electronics CL6011B Especificaciones Pagina 34