Manual

Operating Manual Freeze Dryer ALPHA 1-4 LDplus / ALPHA 2-4 LDplus LDplus Control System  43
5.4.2.2. Active phase
 Freezing
The ice condenser is cooled.
 WarmUp VP
The ice condenser is cooled and the vacuum pump is
activated with the pressure control valve closed. If no
pressure control valve is installed, the drying chamber
has to be shut off from the vacuum pump using a
manual valve, for example.
 Main drying
The drying chamber is evacuated with the ice condenser
being cooled. If a vacuum control system is included, the
vacuum is controlled with the corresponding set value
for main drying.
 Final drying
The final drying phase is only available if a vacuum
control system is included. Different control parameters
(set vacuum value, timer) can be defined for main drying
and final drying.
5.4.2.3. Info icon
The info icon flashes every second to draw the user's attention to
error messages, process messages or general information
concerning the process or the unit. The message can be displayed
in the process and equipment information window under Menu ->
Process & Equipment Information System.
5.4.3. Softkey function
Softkeys are keys with dynamic functions assigned to them. The
current key function is displayed in the black field next to the key.
In the screenshot, the left-hand softkey has the function Mode
and the right-hand softkey has the function Menu .