VACUUBRAND CVC 3000 - Manual (Page 34)

page 34 of 80
Pump down function
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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 with VMS (Vac-
uum Management System, see “Accessories”, pg. 69)
• Operation on demand of a speed controlled NT VARIO / VARIO-B
pump
Preselections
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Use the selection knob to select the parameters. All parameters can
be altered even while operation control is running.
+
Speed (only for NT VARIO / VARIO-B pumps): Preselection of the
motor speed for pump down. The selection ”HI” effects the maximum
speed and best ultimate vacuum of the pump (with automatic speed
reduction at ultimate vacuum).
The ”Speed” is adjustable in a range of 1-100% and to ”HI”.
+
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.
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Delay: ”Delay” determines the time the coolant valve remains open af-
ter the process has been stopped. Determines also the time the pump
(only with VMS module and in-line valve) remains running after 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 the coolant valve closes immediately - and that
a pump with VMS module and in-line valve is switched off immediately
- when the process stops.).
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Duration: ”Duration” determines the total process time since control
start.
The process time is adjustable between 1-1440 minutes (24 h) or can