Function Auto Mode - vacuubrand ME 4C NT VARIO Instructions For Use Manual

Function Auto mode

➨ Control of a NT VARIO / VARIO-B pump in function auto mode: Automatic determination of the
boiling vacuum and automatic adaptation of the boiling vacuum in case of changing process
parameters.
Preselections
☞ Use the selection knob to set the parameters.
☞ Sensitivity: The "Sensitivity" of the control effects the control speed. High sensitivity leads to a reduced
pumping down speed, e. g. for small amounts of solvents or foaming processes. Use a low sensitivity for
"uncritical" processes to reduce process time. Usually setting the "Sensitivity" to "normal" is appropri-
ate.
The "Sensitivity" is adjustable to "high", "normal" or "low".
☞ Speed: The maximum motor speed can be preselected (to limit the pumping speed). The selection
"HI" (recommended) causes an automatic limitation of the adaptation depending on parameters de-
termined during the process. Only in case of very sensitive processes it is advisable to reduce the
maximum speed.
The "Speed" is adjustable in a range of 1-100% or can be set to "HI".
☞ Minimum: If the vacuum value reaches "Minimum" the process is stopped. Use "Minimum" for auto-
matic process termination. When selecting "Auto" the controller switches off automatically at the end
of the process (boiling plateau), recommended only for large amounts of solvents.
The "Minimum" is adjustable in a range of 2 - 1060 mbar, or can be set to "Auto" or to "Off".
☞ Delay: "Delay" specifies the time the coolant valve continues to run after process stop.
The "Delay" is adjustable in a range of 1-300 minutes or can be set to "Off".
☞ Duration: "Duration" determines the total process time since control start.
The "Duration" is adjustable between 1-1440 minutes (24 h) or can be set to "Off". A preset "Duration"
(process time) is without effect, if the process is stopped earlier by reaching the preset "Minimum".
The screen-shot shows the factory-set values.
Auto mode
Sensitivity
Speed
Minimum
Delay
Duration
- - - - - - Graphic - - - - - -
- - - - - - - Back - - - - - - -
When "Graphic" is selected the display shows a pressure vs. time curve (right screen-shot).
The timeline in the diagram adapts automatically to the process time.
☞ Press the selection knob twice to return to the standard display.
Temporary switching from "Auto mode" to function "Vac control"
☞ Press key "MODE". The controller switches to "Vac control" . The current pressure value is used and
held as new set point.
☞ The preset function of the controller does not change due to this temporary switching. When pressing
key "STOP" the controller is set again to the function "Auto mode".
Documents are only to be used and distributed completely and unchanged. It is strictly the users' responsibility to check carefully
the validity of this document with respect to his product. Manual-no.: 999164 / 19/05/2009
page 34 of 75
00:00:00
normal
HI
Off
Off
Off
Auto mode 50 mbar
00:07:45