Response Electronics CL6011B Especificaciones descargar pdf (Pagina 31)

3Ć11 Theory of Operation: Point Processing

Original Ć June 1990 CE4.2:CL6211

3.3.1.6 Error Squared

The Error Squared PI/PID PCA provides two or three mode control

capability. The proportional gain of the algorithm changes as a function

of the square of the error term, i.e. the effective proportional gain

increases as the deviation between the process variable and set point

increases. This action is illustrated in Figure 3Ć3. The control action is

based on the following equations:

DN(s)Ă +Ă T

dPV

) PV * aĂT

dDN

IVPĂ +Ă K[Ă|SP * DN| @ (SP * DN) )

(SP * DN)dt]

The Error Squared PCA, other than it's proportional gain feature,

performs the same as the PID algorithm.

30 Gain

03010 20-10-30 -20

Deviation

Percent of Span Deviation

Base Gain of 1

Figure 3Ć3. Error Squared Algorithm Response

3.3.1.7 Notch Gain

The Notch Gain PI/PID PCA provides two or three mode control

capability in which the proportional gain of the algorithm changes based

on the value of the process variable relative to it's upper and lower gain

break points. The base proportional gain is multiplied by the Notch Ratio

whenever the process variable is within the notch region established by

the break points. The proportional gain is unchanged whenever the

process variable is above the upper break point or below the lower break

point. This action is illustrated in Figure 3Ć4 on page 3Ć12.

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Response Electronics CL6011B Especificaciones Pagina 31