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The controller determines the process characteristics in a self-tuning attempt and uses
Self-tuning
these values for calculating the control parameters for quick line-out to the set-point
without overshoot. If start-up circuit was selected, it is interrupted.
The available methods are: step and pulse method.
Permission of self-tuning methods
be permitted exclusively (parameter
For processes with fast response
+
+
For other processes
and
ti
td
Quickest and easiest self-tuning is with start-up and step.
M
I
Self-tuning start
and
simultaneously.
Only the operator shall start self-tuning
always after supply voltage switch-on, or after control oscillations > 5 K, however,
The controller shall start self-tuning automatically
+
self-tuning can be started also manually by the operator.
Manual start by the operator is possible only, if parameter
Starting automatically is possible with all
Self-tuning procedure
example. For other control types, expressions ’heating’ and ’cooling’ must be
With 3-point controllers
replaced. ’Heating’ and ’cooling’ are optimized separately, and separate parameters
are used.
thermometers or > 24 % with other transducers): a step and a pulse attempt are
During start-up
made. If only the pulse attempt is permitted, the step attempt is omitted. If one of the
attempts is successful, self-tuning is finished. If none of the attempts is successful,
the controller cancels self-tuning.
for ’heating’ followed by a pulse attempt for ’cooling’. If it is successful, ’cooling’
With 3-point controllers
self-tuning is finished. If it is not successful, the controller cancels the ’cooling’
self-tuning and uses the ’heating’ parameters for ’cooling’.
successful, self-tuning is finished. If it is not successful, the controller cancels
At the set-point
self-tuning.
’heating’ attempt or a ’cooling’ attempt with negative output value (
With 3-point controllers
, both methods should be permitted (
are only used during self-tuning, if they were > 0 previously.
is displayed blinkingly.
AdA
, the function is explained at the temperature control
(with control deviations > 60K with thermocouples / resistance
, the controller lines out to the set-point with the parameters
(with smaller control deviations): a pulse attempt is made. If it is
: If the mean output value is positive when starting (
(e.g. hot runner control), the pulse method should
=
).
AdAP
1
: parameter
values.
Loc
=
).
AdAP
0
=
. Start is by pressing
AAdA
0
: Parameter
AAdA
=
Loc
) is made.
C
=
. Start is
1
,
,
.
0
5
6
), a
H
13
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