West Control Solutions Pro-16 - Manual (Page 18)

Operation
9499-040-93811 / 59537-1 Page 18 of 88 Pro-16

with active gradient function ( PArA/ SETP/ r.SP 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 stable
condition, the controller makes a pulse attempt. This pulse reduces the correcting variable
by max. 20%
1, to generate a slight process value undershoot. The changing process is
analyzed and the parameters thus calculated are recorded in the controller. The optimized
parameters are used for stabilized to the set-point.
Optimization at 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 determined. If the
controller is in the "cooling-phase" the cooling-parameters are determined.
1
If the correcting variable is too low for reduction in stable condition
it is increased by max. 20%.