VACUUBRAND PC 620 NT plastic housing - Manual (Page 54)

page 54 of 113
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. 86.
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.