West-control-solutions KS 92-1 Programmer manual Manuel d'utilisateur télécharger pdf (Page 17)

3.5.3 Selecting the method ( ConF/ Cntr/ tunE )

Selection criteria for the optimization method:

Step attempt after start-up Pulse attempt after start-up Optimization at the set-point

tunE =0

sufficient set-point reserve is

provided

sufficient set-point reserve is not

provided

tunE =1

sufficient set-point reserve is

provided

sufficient set-point reserve is not

provided

tunE =2

always step attempt after

start-up

Sufficient set-point reserve:

inverse controller:(with process value < set-point- (10% of rnGH - rnGL)

direct controller: (with process value > set-point + (10% of rnGH - rnGL)

3.5.4 Step attempt after start-up

Condition: - tunE = 0 and sufficient set-point reserve provided or

- tunE =2

The controller outputs 0% correcting variable or Y.Lo and waits, until the process

is at rest (see start-conditions on page 8).

Subsequently, a correcting variable step change to 100% is output.

The controller attempts to calculate the optimum control parameters from the pro-

cess response. If this is done successfully, the optimized parameters are taken

over and used for line-out to the set-point.

With a 3-point controller, this is followed by “cooling”.

After completing the 1st step as described, a correcting variable of -100% (100%

cooling energy) is output from the set-point. After successfull determination of

the “cooling parameters”, line-out to the set-point is using the optimized parame-

ters.

3.5.5 Pulse attempt after start-up

Condition: - tunE = 1 and sufficient set-point reserve provided.

The controller outputs 0% correcting variable or Y.Lo and waits, until the process

is at rest (see start conditions page 8)

Subsequently, a short pulse of 100% is output (Y=100%) and reset.

The controller attempts to determine the optimum control parameters from the

process response. If this is completed successfully, these optimized parameters

are taken over and used for line-out to the set-point.

With a 3-point controller, this is followed by “cooling”.

After completing the 1st step as described and line-out to the set-point, correcting

variable "heating" remains unchanged and a cooling pulse (100% cooling energy)

is output additionally. After successful determination of the “cooling parame

ters”, the optimized parameters are used for line-out to the set-point.

Operation

KS 90-1p / KS 92-1p 17 Self-tuning

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West-control-solutions KS 92-1 Programmer manual Manuel d'utilisateur Page 17

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