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Building Technologies
Basic Documentation LMV5...
CC1P7550en
7 Boiler controller / load controller
22.05.2018
Optimum adaption of the controllers to the controlled system can be checked by
recording the actual value during startup while the controlled system is working. The
diagrams below reveal incorrect settings and give hints on remedy.
Here, the behavior of a controlled system of 3rd order for a PID controller is shown. The
procedure for setting the control parameters can also be applied to other types of
controlled systems.
Practical value of Tn : Tv = 4...6.
XP too small
XP too great
t
x
w
7550d21/0501
t
x
w
7550d22/0501
Tn and Tv too small
Tn and Tv too great
t
x
w
7550d23/0501
t
x
w
7550d24/0501
Optimum setting
t
x
w
7550d25/0501
Figure 56: Modulating control – checking the control parameters
Checking the control
parameters
Example