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Program function
➨
Permits ten programs to be defined and stored, each with up to
ten program steps with preset values for vacuum and time.
+
Edit:
Use to define the preset values for the process run:
Time:
Defines either the process runtime for each program step to
reach a preset vacuum level or, if programming a ”Step”, the runtime
after having achieved the vacuum level. The total process runtime is
shown in the base line. Attention: A preset runtime of 99:59:59 hours
in the final program step will cause the process to run endlessly. Ter
-
minate the process by pressing the ”START/STOP” key .
Vacuum:
Vacuum level to be attained.
Venting valve:
Operating a venting valve to reach a preset vacuum
level.
”Step”:
”Step” causes pump down as fast as possible to the preset
vacuum level. As soon as the vacuum level is reached the time meter
starts running.
+
Open:
Choose program (Programs 0 - 9).
+
Store:
This command stores an edited program or the program of the
last process to one of the storage spaces 0 - 9.
+
Hysteresis
: The ”
Hysteresis
” is the control bandwidth of the two-point
control. A too small hysteresis will lead to frequent switching of the
valve or the pump. A too large hysteresis will lead to imprecise con-
trol. Suggested ”
Hysteresis
” values are stored in the controller (setup
”Auto”) and are adapted automatically to the preset pressure. The hys-
teresis can be adapted at any time.
The ”
Hysteresis
” is adjustable in a range of 1-225 Torr (1-300 mbar) or
can be set to ”Auto”.
+
Delay:
”
Delay
” determines the time the pump (with VMS module and
in-line valve) remains running and the coolant valve remains open af-
ter the process has been stopped.
The ”
Delay
” is adjustable in a range of 1-300 minutes or can be set to
”Off” (”Off” means that when the process stops, the pump is switched
off and the coolant valve closes immediately.).
