Self-Tuning - PMA KS 90 Mode D'emploi

Self tuning (automatic adaption of control parameters)
After start by the operater, the controller makes an attempt for adaption. Thereby, it
calculates the parameters for fast line-out to the set-point without overshoot from the
process characteristics. The start-up circuit is interrupted.
+For adaption, Ä parameter Loc must be 0 ( Loc > 0 disables the adaption).
+ti and td are only taken into account during adaption, if they are > 0 previously.
Starting the adaption: The operator can
start the adaption attempt at any time. For
this, keys M and I must be pressed simul-
taneously. Display is as shown here.
Y is displayed by pressing M. The controller continues the adaption if
1 The process value is ? 10% of W
above set-point (direct mode) and the
2 difference process value i set-point is ? 2% of X
Wh = SPH - SPL (set-point range), Xh = InH - InL (control range)
Adaption sequence
Example 1: controller inverse, heating
With process value increasing 1 or
decreasing 2 or around set-point 3,
the heating energy Y is switched off (a).
If the change of process value X is
constant for one minute and the control
deviation is > 10 % of W
is switched on. At the turning point (c),
adaption attempt is finished and set-point
W is controlled with the new parameters.
Example 2: controller inverse, heating/cooling
The parameters for heating and cooling
are determined in one attempt, the
heating function is as above (a, b, c).
Set-point is controlled with the heating
parameters Pb1, ti, td and t1.
The cooling energy is switched on (d).
At the turning point (e), Pb2 and t2 are
determined, and the adaption attempt is
finished. Set-point W is controlled with
the new parameters.
With sufficient process reaction, the attempts are successful and new control
parameters are determined. After successful adaption, AdA disappears and the
actual process value is displayed.
14
below set-point (inverse mode) or ? 10% of W
h
(b), the energy
h
.
h
h