West Control Solutions Pro-16 - Manual (Page 21)

Operation
9499-040-93811 / 59537-1 Page 21 of 88 Pro-16
Start: heating power switched on
Heating power Y is switched off ( 1). When the
change of process value X was constant during one
minute (
2), the power is switched on (3).
At the reversal point, the self-tuning attempt is
finished and the new parameter are used for
controlling to set-point W.
Start: heating power switched off
The controller waits 1,5 minutes ( 1). Heating
power Y is switched on ( 2). At the reversal point,
the self-tuning attempt is finished and control to the
set-point is using the new parameters.
Self-tuning at the set-point a
The process is controlled to the set-point. With the
control deviation constant during a defined time
(
1), the controller outputs a reduced correcting
variable pulse (max. 20%) ( 2). After determination
of the control parameters using the process
characteristic (
3), control is started using the new
parameters ( 4).
Three-point controller a
The parameter for heating and cooling are
determined in two attempts. The heating power is
switched on (
1). Heating parameters Pb1,
ti1, td1 and t1 are determined at the
reversal point. The process is controlled to the set-
point (
2). With constant control deviation, the
controller provides a cooling correcting variable
pulse (
3). After determining its cooling parameters
Pb2, ti2, td2 and t2 (4) from the process
characteristics , control operation is started using
the new parameters (
5).