West-control-solutions KS 92-1 Programmer manual Bedienungsanleitung PDF herunterladen (Seite 16)

3.5.1 Preparation for self-tuning

Adjust the controller measuring range as control range limits. Set

values rnG.L and rnG.H to the limits of subsequent control.

(Configuration r Controllerrlower and upper control range limits)

ConFrCntrr rnG.L and rnG.H

Determine which parameter set shall be optimized.

- The instantaneously effective parameter set is optimized.

r Activate the relevant parameter set (1 or 2).

Determine which parameter set shall be optimized (see tables above).

Select the self-tuning method

see chapter 3.5.3

-Step attempt after start-up

- Pulse attempt after start-up

- Optimization at the set-point

3.5.2 Optimization after start-up or at the set-point

The two methods are optimization after start-up and at the set-point.

As control parameters are always optimal only for a limited process range, vari-

ous methods can be selected dependent of requirements. If the process behaviour

is very different after start-up and directly at the set-point, parameter sets 1 and 2

can be optimized using different methods. Switch-over between parameter sets

dependent of process status is possible (see page ).

Optimization after start-up: (see page 4)

Optimization after start-up requires a certain separation between process value

and set-point. This separation enables the controller to determine the control pa-

rameters by evaluation of the process when lining out to the set-point.

This method optimizes the control loop from the start conditions to the set-point,

whereby a wide control range is covered.

We recommend selecting optimization method “Step attempt after start-up”

with tunE = 0 first. Unless this attempt is completed successfully, we recom

mend a “Pulse attempt after start-up”.

Optimization at the set-point: (see page 18)

For optimizing at the set-point, the controller outputs a disturbance variable to the

process. This is done by changing the output variable shortly. The process value

changed by this pulse is evaluated. The detected process parameters are con

verted into control parameters and saved in the controller.

This procedure optimizes the control loop directly at the set-point. The advantage

is in the small control deviation during optimization.

Operation

Self-tuning 16 KS 90-1p / KS 92-1p

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West-control-solutions KS 92-1 Programmer manual Bedienungsanleitung Seite 16