Response Electronics CL6011B Especificaciones Pagina 32

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3Ć12 Theory of Operation: Point Processing
Original Ć June 1990CE4.2:CL6211
The control action is based on the following equations:
DN(s +Ă T
d
dPV
dt
) PV * aĂT
d
dDN
dt
IVPĂ +Ă KĂ
ȧ
ȱ
Ȳ
(SP * DN) )
ŕ
R
0
ǒ
1
T
i
@ (SP * DN) * K1 @ (1 * R
d(SP * DN)
dt
where: UBP= Upper Break Point
LBP= Lower Break Point
K1=ON/OFF Logic Switch
If UBP > PV > LBP Then
K1 = 1
Else
K1 = 0
Note that the integral and rate time constants are not affected by the
notch ratio.
0% 100%
Process Variable
Lower
Break
Point
Upper
Break
Point
Notch Ratio >1
Controller
Gain
Base Gain
Notch Ratio <1
Figure 3Ć4. Notch Gain Algorithm Response
3.3.1.8 Adaptive Gain
The Adaptive Gain PI/PID PCA provides two or three mode control
capability with the ability to modify it's proportional gain as a function of
designated parameters. The process variable, the deviation between the
process variable and set point, the implied valve position, an external
analog value, an external discrete value, or any combination of these
parameters may be used to modify the proportional gain of the loop.
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