Overview Of External Control Parameters - Lauda IN 550 XT FC Operation Manual

6.4.3 Overview of external control parameters

Correction limitation
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External control consists of a master controller (external controller) and
n
a slave controller (internal controller). The temperature of the consumer
to be temperature controlled is also required. In general this is deter-
mined with an external "Pt100 sensor".
The master controller compares the set temperature with the external
n
temperature (consumer temperature) and, from these temperatures,
calculates the set temperature (set_internal) for the slave controller
(internal controller).
The slave controller compares the set temperature (set_internal) with
n
the outflow temperature and calculates the actuating signal, i.e. the
measurement used for heating or cooling.
Table 31: The following control parameters can be adapted on the master
controller (external controller):
Characteristics
Kpe
Tne
Tve
Tde
Prop_E
Table 32: The following control parameters can be adapted on the slave
controller (internal controller):
Characteristics
Xpf
If Tv manual/auto is set to auto , Tv and Tde cannot be modified. In
this case, they are derived with fixed factors of Tne.
The temperature limits Tih and Til also have an effect on the
control.
If a temperature jump is specified via set temperature T
set an outflow temperature which is considerably higher (e.g. 50 K, possible
problem with enamel reactors) than the temperature T
external application. Therefore, there is a correction limitation that specifies
the maximum permitted deviation between the temperature at the outflow
T and the temperature in the external consumer T
int
1. Press the [Enter key] to open the menu.
2.
Select the menu items  Setup  Control  Correction limit..
An entry window opens for the numerical value.

Integral process thermostats with flow control unit
Designation
Amplification factor
Adjustment time
Hold-back time
Attenuation time
Proportional range
Designation
Proportional range
set
ext
.
ext
Unit
-
s
s
s
K
Unit
K
, the control may
required in the
V4