Designation
Abbreviation
Unit
Proportional range
Xp
K
Adjustment time
Tn
s
Hold-back time
Tv
s
Attenuation time
Td
s
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
Chapter 5.9 “Setting temperature
limits Tih and Til” on page 73
Controller output limit: Heating power and cooling capacity
6.5 “Defining the actuating signal limit” on page 89
6.8.3 Overview of external control parameters
The control system for the external actual value is designed as a 2-stage
cascade controller to improve guidance behavior and consists of a guide
controller (external controller) and a slave controller (internal controller).
The temperature of the relevant consuming unit T
ext
is also required. This
temperature is measured using an external Pt100 temperature probe or an
interface for importing the actual temperature.
The guide controller compares the set temperature T
set
with the external
temperature in the consuming unit T
ext
and uses these temperatures to
calculate the set temperature (set_internal) for the slave controller (internal
controller).
The slave controller compares the set temperature (set_internal) with the
outlet temperature and calculates the actuating signal, i.e. the measurement
used for heating or cooling.
If set temperature T
set
indicates a temperature jump, the control may set an
outlet temperature much higher than the temperature T
ext
required in the
external container. Therefore, there is a correction limitation that specifies
the maximum permitted deviation between the temperature at the output
T
int
and the temperature in the external consuming unit T
ext
.
The following control parameters can be set on the guide controller (PID
1
controller or external controller).
Designation
Abbreviation
Unit
Amplification factor
Kpe
-
Proportional range
Prop_E
K
Adjustment time
Tne
s
Correction limitation
Control parameters on the guide controller
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