Function vac control – VACUUBRAND PC 620 NT User Manual
Page 27
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.: 999188 / 19/05/2009
Preselections
☞
The selection of the parameters is carried out via the selection knob. All parameters are also change-
able during running operation control.
☞
Set vacuum: The ”Set vacuum” is the lower vacuum value for two-point control.
The ”Set vacuum” is adjustable in a range of 1 - 1060 mbar and to ”Turbo”.
☞
Hysteresis: Control bandwidth of a two-point control. A too small hysteresis leads to frequent switch-
ing of the valve or the pump, a too large hysteresis leads to imprecise control. Suggested values (see
table) for the ”Hysteresis” are stored in the controller (setup ”Auto”) and are adapted automatically to
the preset pressure. Adapting the hysteresis by the user is possible at any time.
The ”Hysteresis” is adjustable in a range of 1 - 300 mbar and to ”Auto”.
➨
Vacuum control to a preset vacuum value
• Operation of a vacuum pump via isolation valve
• Operation of a vacuum pump without isolation valve with VMS (Vacuum Management System,
see ”Accessories”)
☞
Maximum: An upper pressure limit can be preselected. The pump switches off if the pressure limit is
exceeded, e. g. at the end of suctions, filtrations. The pressure limit is only active after the pressure
was below the ”Maximum” before.
The ”Maximum” is adjustable in a range of 1059 - 1 mbar (minimum 1 mbar higher than the ”Set
vacuum”) and to ”Off”. ”Off” indicates that no maximum value is preset.
☞
Delay: ”Delay” determines the time the pump (with VMS and isolation valve) and the coolant valve
run on after stopping the process.
The ”Delay” is adjustable in a range of 1-300 minutes and to ”Off”.
☞
Duration: ”Duration” determines the total process time since control start.
The process time is adjustable between 1-1440 minutes (24 h) and to ”Off”. ”Off” indicates that no
endpoint for pump down is determined.
If a ”Duration” is preset, the controller switches off the pump if the preset process time is reached,
also if a preset ”Minimum” is still not reached.
Function Vac control
Set vacuum in mbar
5
10
50
80
100
200
500
700
900
1000
Hysteresis in mbar
(suggested values)
2
2
5
8
9
17
40
55
71
78