VACUUBRAND MV 2 VARIO - Manual (Page 17)

page 17 of 41
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.: 999035 / 15/12/2009
appropriate basic setup, TURBO•MODE, pressure control or continuous pumping
with preset pumping speed: The components of the chemistry vacuum system (air
admittance valve) have to be preset once only. The basic set up as from last operation
and the preselected values (e. g. for pressure, speed) are stored. In case of similar
operation conditions it is possible to start immediately, if the preselections are chosen
appropriately.
How to configurate the controller
Pressure control
☞ Position control on preset pressure value.
☞ The pumping speed is adapted to the occurring gas/vapour,
so that the preset pressure value is kept constantly.
☞ Operating in equilibrium by continuous adaption of the con-
troller, no abrupt switching of valves.
Continuous pumping with preset pumping speed
☞ Simple suction, suck liquids by siphon, drying, sucking off
excess, etc.
☞ Suction with regulated pumping speed.
☞ Pumping down until the ultimate vacuum of the pump is
achieved (e. g. to dry a system).
☞ System controlled by an interface: temporally variable pump-
ing speed to optimize the process conditions (e. g. to dry
sensitive substances).
☞ Setting ”Hi”: Optimum pumping speed at every pres-
sure, speed adapted automatically to provide always the
maximal pumpage.
In all basic setups:
☞ If an air admittance valve has been connected and prese-
lected:
☞ Key-driven venting or adjustment of the set point by venting
if process control is active.
- the components which are connected to the system.
- the specific user and/or process requirements.
TURBO•MODE
☞ The diaphragm pump is operated according to the preset
pressure value (backing pressure).
☞ High pumping speed due to 80 Hz operation to reduce pump-
down time.
☞ To reduce motor speed during regular high and ultrahigh
vacuum operation for additional extension of the lifetime of
diaphragms and valves (only as much diaphragm strokes
as necessary).
☞ Control algorithm to determine the motor speed to reach
the best backing pressure/ultimate vacuum of the turbo
molecular pump (backing pressure ”Lo”).
The controller CVC 2000
II
can be adapted to the specific application by choosing the
The vacuum controller CVC 2000
II
offers three basic setups depending on