VACUUBRAND MZ 2C VARIO - Manual (Page 31)

page 31 of 51
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.: 999034 / 22/04/2008
Mode VACUU•LAN
After switching on
Starting and stopping the process control
The process control is not active, i. e. the controller is ready for
vacuum control, but control operation has not been started.
☞ The mode as from last operation is reactivated (after first
switching on “vacuum control” (factory-set) is displayed).
☞ The actual pressure is displayed.
☞ Values as from last operation are reactivated (factory-set:
time for automatic shut down 15 minutes, pressure value
(condition for switching off) 25 mbar, upper set point (condi-
tion for restart) 150 mbar).
☞ Press key START/STOP to start process control.
☞ A coolant valve has to be preselected, see section ” Setting
the mode”.
➨ Starting process control: Press key START/STOP.
☞ The pump is switched on.
☞ If a coolant valve is preselected: Coolant valve opens im-
mediately, the symbol is displayed.
☞ If the pressure for switching off is achieved, motor speed
becomes reduced.
☞ The pump (and the coolant valve if applicable) is switched
off if the pressure is below the lower pressure value longer
than the time for automatic shut down.
☞ The pump starts automatically if the pressure is higher than
the upper pressure value and in case of sudden gas forma-
tion.
➨ Stopping: After pressing key START/STOP or venting the
process control stops.
☞ The pump is switched off.
☞ If a coolant valve is preselected: The coolant valve is
switched off.
Venting
(only possible if an external venting valve is connected and configurated)
Short venting, e. g. in case of radiation of boiling or sudden
foaming occurs:
➨ Press key VENT shortly (< 2 sec.).
☞ Pumping is interrupted, the process control is stopped.
Venting the system:
➨ Press key VENT continuously (> 2 sec.) until symbol vent-
ing valve is flushing.
☞ Pumping is interrupted, the process control is stopped.
☞ Ventilation until pressure does not change any more, i. e.
until atmospheric pressure is attained.
☞ Key STOP interrupts venting at any time.
Attention: If pressurized
inert gas is used install an
overpressure relief valve.
Ensure that high pressure
is compatible with the
mechanical stability of the
system!
VENT
START
STOP