6 examples for self-tuning attempts 45, Examples for self-tuning attempts – West Control Solutions KS 45 User Manual
Page 45
7.3.6
Examples for self-tuning attempts
(controller inverse, heating or heating/cooling)
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
setpoint SP.
Start: heating power switched off
The controoler waits until the process value has a con-
stant change of more than one minute. This possibly
takes place already at start up (1). Heating power Y is
switched on (2). At the reversal point, the self-tuning at-
tempt is finished and control to the setpoint is using the
new parameters.
Start: at setpoint
Heating power Y is switched off (1). If the change of
process value X was constant during one minute and the
control deviation is > 10% of
SP.Hi - SP.LO (2), the
power is switched on (3). At the reversal point, the
self-tuning attempt is finished, and control to setpoint SP
is using the new parameters.
Three-point controller
The parameters for heating and cooling are determined in
one attempt. The heating power is switched on (1). At re-
versal point 1, heating parameters
Pb1, ti1, td1 and
t1 are determined. The process value is lined out to the
setpoint (2). The cooling power is switched on (3). At re-
versal point 2, parameters
Pb2, ti2, td2 and t2 are
determined and the self-tuning attempt is finished. Control
to setpoint SP is using the new parameters.
Controlling
KS 45
45
Self-tuning
t
100%
Y
0%
X
SP
Start r
1
2
t
Wendepunkt
reversal point
.A
.A.d
.d.A
.A.
AdA
“ - “
t
2
100%
Y
0%
X
SP
Start r
1
3
t
Wendepunkt
reversal point
.A
.A.d
.d.A
.A.
AdA
“ - “
t
2
100%
Y
0%
X
SP
Start r
1
3
t
Wendepunkt
reversal point
.A
.A.d
.d.A
.A.
AdA
“ -”
t
+100%
Y 0%
-100%
X
SP
t
Wendepunkt 1
reversal point 1
t
Wendepunkt 2
reversal point 2
Start r
1
2
3
AdA
.A
.A.d
.d.A
.A.
.A
.A.d
.d.A
.A.
“ - “
t
+100%
Y 0%
-100%
X
SP
t
Wendepunkt 1
reversal point 1
t
Wendepunkt 2
reversal point 2
Start r
1
2
3
AdA
.A
.A.d
.d.A
.A.
.A
.A.d
.d.A
.A.
“ - “