Working with the controller, Working with the controller“, pg. 21, P. 21 – VACUUBRAND VNC 2 E User Manual
Page 21
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.: 999199 / 28/11/2012
Program menu in factory-set mode pControl
pControl
p Set
pControl
∆p
pControl
t Off
p Set
25mbar
∆p
Auto
t Off
off
1013mbar
Start
Working with the controller
Factory-set mode ”Vacuum control” (pControl)
Control with in-line valve:
• Control of a vacuum pump via an in-line valve. The pump continues to run according to the preset
time delay. This can considerably reduce possible condensation inside the pump. The coolant valve
is open during vacuum control and during time delay.
• For synchronous switching of the pump and the in-line valve:
Configure the time delay in the device menu: Delay: off.
☞
Use keys s or t in the program menu to select an item.
☞
Confirm selection with key ”Enter”.
☞
Adjust parameters with keys s or t.
☞
Confirm with key ”Enter” or return to original setting pressing ”Esc”.
pControl
Limit
Limit
1060mbar
Esc
↵
↵
↵
↵
• Vacuum control of a vacuum pump (with in-line valve)
Settings in the program menu:
☞
Preset pressure (p Set): Lower pressure value for two-point control (displayed during active con-
trol by a short tip on key t).
☞
Hysteresis (∆p): Control range of the two-point control.
☞
Switch-off time (t Off): The duration of the process (vacuum control) can be preset. If the pump is
switched off due to surpassing of the pressure limit (Limit), the switch-off time is without effect.
☞
Maximal pressure (Limit): Shut down of the pump when the ”Limit” value is exceeded, e.g. at
the end of filtrations or extractions (active only
after the pressure did fall below the preset pressure
(p Set) for the first time).
Suggested values for the hysteresis ∆p are stored in the controller (setting: ”Auto”) and are adapted
automatically to the preset pressure values. It is possible to adjust the parameters manually anytime.
p in mbar
5
10
50
80
100
200
500
700
900
1000
∆
p in mbar
(suggested values)
2
2
5
8
9
17
40
55
71
78