West-control-solutions KS 92-1 Programmer manual Manuel d'utilisateur télécharger pdf (Page 18)

3.5.6 Optimization at the set-point

Conditions:

A sufficient set-point reserve is not provided at self-tuning start (see page 17).

tunE is0or1

With Strt = 1 configured and detection of a process value oscillation by

more than ± 0,5% of (rnG.H - rnG.L) by the controller, the control

parameters are preset for process stabilization and the controller realizes an

optimization at the set-point (see figure “Optimization at the set-point”).

when the step attempt after power-on has failed

with active gradient function ( PArA/ SETP/ r.SP¹ OFF), the set-point

gradient is started from the process value and there isn't a sufficient set-point

reserve.

Optimization-at-the-set-point procedure:

The controller uses its instantaneous parameters for control to the set-point. In

lined out condition, the controller makes a pulse attempt. This pulse reduces the

correcting variable by max. 20% 1, to generate a slight process value under

shoot. The changing process is analyzed and the parameters thus calculated are

recorded in the controller. The optimized parameters are used for line-out to the

set-point.

With a 3-point controller, optimization for the “heating“ or “cooling” parameters

occurs dependent of the instantaneous condition.

These two optimizations must be started separately.

1 If the correcting variable is too low for reduction in lined out condition it is

increased by max. 20%.

Operation

Self-tuning 18 KS 90-1p / KS 92-1p

set-point

process value

correcting

variable

Optimization at the set-point

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West-control-solutions KS 92-1 Programmer manual Manuel d'utilisateur Page 18