West-control-solutions KS 92-1 Programmer manual Manual do Utilizador descarregar pdf (Página 23)

3.6 Manual self-tuning

The optimization aid should be used with units on which the control parameters

shall be set without self-tuning.

For this, the response of process variable x after a step change of correcting vari

able y can be used. Frequently, plotting the complete response curve (0 to 100%)

is not possible, because the process must be kept within defined limits. Values T

and x

max

(step change from 0 to 100 %) or Dt and Dx (partial step response) can

be used to determine the maximum rate of increase v

max

The control parameters can be determined from the values calculated for delay

time T

, maximum rate of increase v

max

, control range X

and characteristic K ac

cording to the formulas given below. Increase Xp, if line-out to the set-point os

cillates.

Operation

KS 90-1p / KS 92-1p 23 Manual self-tuning

100%

max

y = correcting variable

= control range

Tu = delay time (s)

Tg = recovery time (s)

max

= maximum process value

max

Xmax

{

= max. rate of

increase of process value

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West-control-solutions KS 92-1 Programmer manual Manual do Utilizador Página 23