Lauda MC 250, Operation Instructions Manual

Page: 37 / 64

6.3 Screen displays
The default display is the indication shown in the screen if no other opera-
tions such as configuring settings are being performed. The actual tem-
perature of the machine is shown in the default display.
The machine menu with possible settings can be invoked using the ENTER
button.
Further information about the menu structure and the menu navi-
gation can be found in
Ä
Chapter 6.2 ‘Default display and menu
items’ on page 34 .
The display flashes when a menu item in the screen has been selected. The
setting can now be made. The value entered is applied when the setting is
confirmed.
6.4 Specifying the setpoint temperature
You specify a setpoint for the temperature control. This value specifies to
which temperature the heat transfer liquid will be cooled. The upper and
lower temperature limit values of the device have been set to the default
values 45.0 °C and 5.0 °C. The temperature limits define the temperature
range of your application, i.e. in which range any temperature control can
take place. A warning is output by the device if the temperature is outside
the limits. This range is necessary so that no unnecessary warnings are output
during transient conditions of the temperature regulation. The default values
can be limited subsequently depending on the heat transfer liquid.
For operation of the device with Aqua 90, the temperature setpoint must
not be set smaller than 5 °C. Also use the lower temperature limit value Lo
Ä
‘Lower temperature limit value’ on page 38 and set this to 3 °C so that a
warning is output for lower temperatures.
The yellow LED on the device lights if any temperature setpoint or actual
temperature is less than 5 °C. It warns about incorrect use of the heat
transfer liquid and consequential damage to the device.
If the device is operated with liquid temperatures below 5 °C,
Kryo 30 (glycol / water) must be used in the device as heat transfer
liquid.
Personnel:
n
Operating personnel
1. Select the menu item for specifying the temperature setpoint.
Default display
Fig. 13: Default display
Menu
Editing display
Relationship between temperature setpoint
and temperature limit values
Fig. 14: Setpoint input
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