Siemens SIPART DR22 Manual page 97

Manual
parameters cP (Kp), tn, tv, AH and Yo are controlled by a straight line with 5 vertex points at 10
%, 30 %, 50 %, 70 % and 90 % of the controlling variable. The controlling variable is selected
by S60. All control-relevant, controller-internal variables are available.
S59 PAU
0 0
0 1
1 0
1 1
2 0
2 1
Table 1-17 active parameter sets for single controllers
depending on S59 and control signal PAU
The parameters are set manually per vertex point (identified by the suffix 1, 3, 5, 7, 9 for 10 %,
30 %, 50 %, 70 %, 90 % of the controlling variable in structuring mode PAST. Beyond the mar-
ginal vertex points 10 and 90 % the set values remain constant. (Exception: Yo can be control-
led over the whole range 0 to 100 %.)
For parameters which do not need to be controlled, same values are set for all vertex points.
The derivative action gain vvc is not controllable but can be set in the range from 0.1 to 10.
When controlling tv a supplementary condition must be satisfied: tv.1 to tv.9 must either be
all = oFF (Pi or P controller) or all ≠ oFF (PID or PD controller). Otherwise the error message
tv/Err appears when jumping out of the structuring mode PAST with the Exit key (see chapter
3.3.3, page 175).
Yo is controllable in the range from 0 to 100 % and then acts like a "fixed set" operating point.
Yo = Auto can also be set, in this case no parameter control takes place but the operating point
is set automatically in non--automatic operation (see operating point in P-controller).
Yo.1 to Yo.9 must either be set all = Auto or all ≠ Auto. Otherwise the error message Yo/Err
appears when jumping out of the structuring mode PASt with the Exit key (see chapter 3.3.3,
page 175).
Typical controlling variables are the control difference xd (it acts as 10jxdj) for progressive
controls and x or y for operating point dependent controls (non-linear controlled systems).
If S60 = 17 is set, a controling variable of 10% is simulated in Pi operation and a controlling
variable of 30% in P operation. In this way you can work with large Kp (cP.3) for example in P
operation (control signal P=1) to reach the operating point quickly. After switching to Pi
operation (control signal P=0) a reduced Kp (cP.1) is active for a stable control.
The parameter values and the value of the controlling variable can be gained by adaptation (see
section "Adaptation" on the next page).
SIPART DR22 6DR2210
C79000-G7476-C154-03
active parameter set
Parameter set I
Parameter set II
controlled parameter set
Parameter set II
Parameter set I
controlled parameter set
1.5 Functional description of the structure switches
1.5.5 Control algorithm, parameter control, adaptation
1 Technical Description
95