VACUUBRAND VNC 1 - Manual (Page 13)

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.: 999118 / 16/12/2009
page 13 of 35
Notes on operation
For operation it is necessary to install valves and/or vacuum pumps.
Max. permitted pressure at pressure transducer: 2 bar (abso-
lute).
☞ The display flashes at a pressure higher than 1060 mbar.
☞ Inside a vacuum system where evaporation occurs, the
vacuum is not uniform. This effects the value of the meas-
ured pressure and such the controlling. Therefore carefully
choose the position where to connect the pressure trans-
ducer.
☞ Condensate and deposits at the pressure transducer falsify
the measurement result.
☞ If residues occur or when working with aggressive or con-
densable substances, install a gas washing bottle in front of
the pressure transducer.
☞ Position controller in such a way, that condensate can
not flow into the pressure transducer.
☞ If necessary, clean pressure transducer, see section ”Clean-
ing the pressure transducer”.
☞ Setting of interface parameters, see ”Interface parameters”.
☞ Presettings at controller, see ”Factory-set modes and menu structure”.
☞ Operating the controller, see ”Working with the controller”.
vacuum connec-
tion
Assignment of pins
6
7
8
3
2
1
5
4
1 cooling water valve
2 + 24V
3 isolation valve
4 external error -
5 external error +
6 mass (PWM -)
7 PWM + (speed control signal for VARIO pumps)
8 +12 V
Note: Texts written in Courier font mirror the display of the LCD of the controller.