External Control Variable (External Measurement Probe) - Lauda Integral XT 150 Operating Instructions Manual

7.15.4 External control variable (External measurement probe)

You only need to read further here if you have connected an external temperature probe or the actual
temperature is read in from a module (and you have activated it as control variable according to Section
7.9.6).
Only modify the control parameters if you have knowledge of control techniques.
The control system for external actual values is implemented for improvement of the control behavior as
a two-stage cascade controller.
From the temperature setpoint and the external temperature, which is generally measured by the exter-
nal Pt100, a "master controller" determines the "internal setpoint" passed to the slave controller.
The control value of the slave controller controls the heating and cooling.
When a setpoint step change is specified, it may be that the optimum control would set an outflow tem-
perature which might significantly exceed the temperature desired on the external vessel.
There is a correction limitation which specifies the maximum permissible deviation between the temper-
ature on the external load and the temperature of the outflow liquid.
These parameters can be set on the master
controller (PIDT
troller):
These parameters can be set on the slave
controller (P controller):
If "Tv manual/auto" is set to automatic, Tve,
Tde and Prop_E cannot be changed. Tve
and Tde are in this case derived from Tne
with fixed factors.
In addition the following parameters can affect the control:
Temperature limits: T
Actuating signal limit: Heating, cooling (þ 7.15.7).
Correction limitation.
Set the temperature limits (T
Heat transfer liquid
Kryo 55
Kryo 30
à Aids in viewing the temporal progression:
-
Graphic mode on the Command remote control,
-
LAUDA Wintherm PC Program.
96
controller or external con-
1
, T (þ 7.10.2).
il ih
/ T ) corresponding to the physical boundary conditions; examples:
il ih
Correction limitation
Depends on heat transfer
liquid and on load.
Description
Gain
Proportional range
Reset time
Derivative time
Damping time
Description
Proportional range
Starting up
Short form
Kpe
Prop_E
Tne
Tve
Tde
Short form
Xpf
T
il
-50 °C 220 °C
-30 °C 90 °C
YAWE0028 / 24/06/2016
Integral XT
Unit
-
K
s
s
s
Unit
K
T
ih