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Pump down function
➨
Continuous pumping with pressure and time settings
• Operation of a vacuum pump via in-line valve
• Operation of a vacuum pump without in-line valve via VMS (Vac-
uum Management System), see “Accessories”, pg. 89.
Preselections
+
Use the selection knob to select the parameters. All parameters can
be altered even while operation control is running.
+
Minimum:
The controller switches the pump off or closes the in-line
valve once the preset value for ”
Minimum
” has been reached.
”
Minimum
” is adjustable in a range of 1-795 Torr (1-1060 mbar) or can
be set to ”Off”.
A preset ”
Duration
” (process time) has no effect if the process is
stopped due to a preset ”
Minimum
” before ”
Duration
” is reached.
+
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.).
+
Duration:
”
Duration
” determines the total process time since control
start.
The process time is adjustable between 1-1440 minutes (24 h) or can
be set to ”Off”. ”Off” indicates that no endpoint for pump down is deter
-
mined.
If a ”
Duration
” is preset, the controller switches off the pump when the
preset process time is reached, even if a preset ”
Minimum
” is still not
reached.
+
If neither ”
Minimum
” nor ”
Duration
” is preset, process control has to be
stopped by pressing the ”START/STOP” key.
