Siemens SIPART DR22 Manual page 98

1 Technical Description
1.5 Functional description of the structure switches
1.5.5 Control algorithm, parameter control, adaptation
-9 -7 -5
Figure 1-54 Example of a Kp control with 10jxdj as a controlling variable for progressive control
Adaptation (S58)
The adaptation procedure represents a reliable and easy to operate commissioning tool. The
adaptation procedure is far superior to manual optimization especially in slow controlled
systems and in PIC controller types. It is activated by the operator and can be aborted at any
time in the event of danger. The parameters determined by the adaptation can be changed and
accepted specifically by the user. Non-linear control lines can also be mastered in connection
with the parameter control.
In the parameterization mode AdAP which is only accessible at S58 ≠0, the following preset-
tings are made for the adaptation procedure:
tU Monitoring time
dPv Direction of step command
dY Amplitude of step command
With the structure switch S58 the choice of the control behavior (with or without overshoot) is
made.
The adaptation principle is divided into line identification and controller design.
-- Line identification
The controller is driven to the desired operating point manually. By pressing the Enter key
the set manual manipulated variable is changed by a step adjustable in the direction (dPv)
and amplitude (dY). The y-step is output at the end of 10 % of the set monitoring time (tU) if
there was a fixed state of the controlled variable during this time. Otherwise there is an error
message with abortion of the identification (see chapter 3.3.3, table 3--2, page 177).
The step response of the controlled system is then accepted with a max. 84 value pairs
(time and amplitude). The respective main controlled variable of the different control types is
96
cP=Kp
cP.9
10
8
6
cP.7
4
cP.5
2
cP.3
cP.1
-3 -1 +1 +3
10 30
+5 +7 +9
50 70 90
SIPART DR22 6DR2210
C79000-G7476-C154-03
Manual
% xd
% SG=10 xd
j j