Overview Of Internal Control Parameters - Lauda P 10 Operation Manual

Fig. 53: Control parameters Tn and Tv too
small
Fig. 54: Control parameters Tn and Tv too
large

6.8.2 Overview of internal control parameters

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In the case shown here, the preset I-component is too large (parameter Tn
too small, Tn must be increased). The I-component integrates the control
deviation until it becomes 0. If integration proceeds too rapidly, the
actuating signal, i.e. the output signal of the controller, is too large. As a
result, the actual value fluctuates (fading) around the target value. The hold-
back time (parameter Tv) should be adapted using the formula:
Tv = Tn x 0.75.
The actual value increases relatively sharply towards the specified target
value. The proportional area settings seem to be correct. If the control devia-
tion becomes smaller, the actual value approaches the target value much
more slowly. The integration component (I-component) must compensate
for the drastic reduction of the proportional component (P-component). In
this case, the I-component is integrated too slowly. The parameter Tn, which
specifies the integration interval, must therefore be reduced. The hold-back
time (parameter Tv) should be adapted using the formula: Tv = Tn x 0.75.
The internal control compares the set temperature T
perature T and calculates the actuating signal, i.e. the measurement used
int
for heating or cooling.
Designation
Proportional range
Adjustment time
Hold-back time
Attenuation time
If Tv manual/auto is set to auto , Tv and Td cannot be modified. In
this case, they are derived with fixed factors of Tn.
The following parameters may also influence the internal control:
Temperature limits: Til and Tih Ä Chapter 5.9 "Setting temperature

limits Tih and Til" on page 70
Controller output limit: Heating power and cooling capacity Ä Chapter

6.5 "Defining the actuating signal limit" on page 80
PRO bath thermostats and circulation thermostats
with the bath tem-
set
Abbreviation Unit
Xp K
Tn s
Tv s
Td s
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