VACUUBRAND MV 10 NT VARIO - Manual (Page 59)

page 59 of 126
VACUULAN function
➨
Optimizes vacuum control for vacuum networks
(e.g., VACUUBRAND VACUU•LAN)
➨
Permits on-demand operation of a speed-controlled pump
(NT VARIO/VARIO-B)
Preselections
+
Use the selection knob to select the parameters.
+
Set vacuum (the lower switch-off value): If the pressure drops below
the ”Set vacuum”, a time-meter starts to run and the motor speed is re-
duced. When the pressure exceeds the ”Set vacuum” pressure again,
the time meter is reset. If the ”Set vacuum” is not reached within 100
hours, the controller signals an error.
The ”Set vacuum” is adjustable in the range of 1-795 Torr (1-1060
mbar).
+
Switch on (the higher switching value): If the pressure exceeds this
pressure, pumping down starts again.
The ”Switch on” pressure is adjustable in the range of 2-795 Torr (2-
1060 mbar) (at the least 1 Torr (mbar) higher than the ”Set vacuum”).
In the event of a sudden high-pressure spike, pumping starts again
even if the ”Switch on” pressure has not been reached (pressure in-
crease control).
+
Delay: If the vacuum is below ”Set vacuum” for longer than the ”Delay”
time, the pump is stopped. Pumping starts again in the event of a rapid
pressure increase or if the ”Switch on” level is exceeded.
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 when the
process stops.).