Lauda VC 1200, Operating Instructions Manual

Page: 62 / 112

3. Confirm with the OK button.

Selection of the menu item Tv manual/auto activates
manual or automatic adjustment of the parameters
depending on the previous setting. An input window is
displayed when the other menu items are selected. The
respective value can be adjusted within the displayed
limits.
4. Adjust the value accordingly.
5. Confirm with the OK button.
6.11.5 Overview of external control parameters
n The external control consists of a master controller (external
controller) and a slave controller (internal controller). The tem-
perature of the consumer to be temperature-controlled is also
required. In general, this is determined with an external "Pt100
sensor".
n The master controller compares the setpoint temperature with
the external temperature (consumer temperature) and uses
this information to calculate the set temperature (set-
point_internal) for the slave controller (internal controller).
n The slave controller compares the set temperature (set-
point_internal) with the outflow temperature and calculates the
actuating signal, i.e. the demand for heating or cooling.
Tab. 8: The following control parameters can be adjusted for the
master controller (external controller):
Parameter Description Unit
Kpe Gain -
Tne Reset time s
Tve Lead time s
Tde Damping time s
Prop_E Proportional range K
Tab. 9: The following control parameters can be adjusted for the
slave controller (internal controller):
Parameter Description Unit
Xpf Proportional range K
If Tv manual/auto is set to auto , Tve and Tde cannot
be changed. In this case, they are derived with fixed
factors from Tne.
Fig. 41: Specifying internal control
parameters
Operation
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