West Control Solutions KS 50-1 - Manual (Page 20)

Optimization-at-the-set-point procedure:
The controller uses its instantaneous parameters for control to the set-point. In li-
ned out condition, the controller makes a pulse attempt. This pulse reduces the
correcting variable by max. 20% 1, to generate a slight process value unders-
hoot. The changing process is analyzed and the parameters thus calculated are re-
corded 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.
While the controller is in the "heating-phase" the heating-parameters are deter-
mined. If the controller is in the "cooling-phase" the cooling-parameters are
determined.
1 If the correcting variable is too low for reduction in lined out condition it is
increased by max. 20%.
Operation
Self-tuning 20 KS50/52-1
set-point
process value
correcting
variable
Optimization at the set-point