Lauda IN 550 XT, Руководство по эксплуатации

Страница: 93 / 172

In the Integral XT the heat output is increasingly reduced if the pump power
falls below 150 W (pump level < 4). This measure protects the heat transfer
liquid from overheating on the heater surface and thus prevents premature
aging of the heat transfer liquid.
6.8 Dead-time correction
The dead-time correction intervenes in the temperature control so that a
stable temperature control can be achieved even with very large dead times.
Use the dead-time correction if you have to operate the application with
long hoses (>> 1 m) at very low flow rates (< 5 l/min).
The dead-time correction is only available if you use a Integral
Flow Control or a flow controller (MID) and the flow controller can
measure the flow of the heat transfer liquid.
The dead-time correction is only available for external control and
has no effect on internal control.
Proceed as follows to use the dead-time correction:
1.
Press the [Enter key] to open the menu.
2.
Select the menu items

Setup

Control

Dead-time correction .
3. Enter the volume of the hose used.
This volume can be mathematically determined just from the
hose length (measured up to the temperature sensor to which
is regulated) and the cross-sectional area of the hose.
4. Activate the dead-time correction with [Function on].
The dead-time correction means that the control system reacts
much more quickly and that different control parameters can be
set than in the case of normal external control as a result of the
principle. In particular, significantly shorter reset times can be set
for use of the dead-time correction.
The control parameters should be customized to the respective application
when using the dead-time correction. On the whole, this results in signifi-
cantly better control action in typical applications.
6.9 Dynamic heatlimiter
This section is relevant for:
n
Integral XT devices
Automatic heat limit for smaller pump
power
Setup
Fig. 54: Control menu
Fig. 55: Dead-time correction menu
V4 Integral process thermostats with flow control unit 93 / 171