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Manual
tY and the resulting response thresholds smaller than in the S-controller with internal posi-
tion feedback for the above mentioned reasons.
The position control circuit is optimized in manual mode. To do this, S67 is set to 0 for the
optimizing phase so that the manual manipulated variable is preset as an absolute value. It
must be noted that the active manipulated variable trails the manipulated variable display
due to the floating time of the actuator.
In the case of non-linearity in the position control circuit, the optimization must take place in
the range of greatest slope.
-- Set S67 to 0
-- Set tA and tE so that the actuating drive can just process the actuating increments
(see S-controller with internal feedback).
-- Set 1st order filter of the y
drive).
-- Increase tY until the position control circuit overshoots due to small manual changes in
the manipulated variable (observe opposite pulse on the ∆y-LEDs (15) in the y-display).
-- Reduce tY slightly again until the position control circuit is calm.
-- Reset S67 to 2.
4.4
Setting the filter and the response threshold
Set the structure switch S3 to the mains frequency 50 or 60 Hz existing in the system (factory
setting 50 Hz) to suppress faults due to the mains frequency.
D Filter of first order of analog inputs
The filter time constants (tF1 to tFb) for the input filters are set in the onPA parameterization
mode and to the greatest possible value permitted by the control circuit without affecting the
controlability (tF1 to tFb < Tg). When using the adaptation method the appropriate input
filters must be optimized.
D Adaptive, non-linear filters of the control difference
Since the dead zone sets itself automatically and its size is therefore unknown, the time tFI
or tFII (onPA) can only be selected so great that the control circuit cannot oscillate in the
case of a large dead zone (tFI or tFII less than Tg). When using the D-part (PD, PID) the
use of the adaptive, non-linear filter is strongly recommended because the input noise
amplified by Kp·vv can be suppressed.
When using the adaptation method the filters must be set.
D Optimization of the response threshold AH
If the controller output is to be calmed or the load on the actuator reduced additionally, the
response threshold AHI can be increased for controller I or AHII for controller II. The
response threshold AH is given in S-controllers by the setting of tE (see chapter 4.3, page
218) and must be greater than zero. A response threshold of approx. 0.5 % is
recommendable for K-controllers.
It must be taken into account that the remaining control error can assume the value of the
set response threshold.
SIPART DR22 6DR2210
C79000-G7476-C154-03
-input (tF1, 2, 3, 4 or 5) to 0.01 Ty (real floating time of the
R
4.4 Setting the filter and the response threshold
4 Commissioning
219
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