KNF N 820.3 FT.40.18, Operating Instructions Manual

Page: 19 / 36

Laboratory vacuum pumps N 8__.3 FT.40.18 Operation
Translation of original Operating Instructions, English, KNF 121350-121429 11/18 19
7.4. Drying system: Changing settings
The variables of the drying system can be adapted to a process
sequence.

t
1
: Time between switching on the drying system and the first
ventlation of the pump heads .

t
2
: Duration of the ventilation of the pump heads.

t
3
: The interval between pump head ventilation operations.
Switch setting
Switch 1
t
1
in sec
Switch 2
t
2
in sec
Switch 3
t
3
in sec
0 t
3
1.0 10.0
1 60.0 1.5 15.0
2 90.0 2.0 25.0
3 120.0 2.5 40.0
4 150.0 3.0 60.0
5 180.0 3.5 120.0
6 210.0 4.0 180.0
7 240.0 5.0 300.0
8 300.0 7.5 600.0
9 360.0 10.0 900.0
Tab. 8: Variables and values
Switch Switch setting Time in sec
1 6 210.0
2 2 2.0
3 3 40.0
Tab. 9: Work setting
DANGER
Extreme danger from electrical shock!

Disconnect the pump power supply before working
on the pump.

Make sure the pump is de-energized and secure.
1. Disconnect the pump from the mains by pulling the plug out of
the socket.
2. Check that the pump and the drying system are dead and
secure them.
3. At the control box, loosen the collar nut of the cable inlet. Use
a slotted screwdriver to release the four screws, then fold the
cover forwards and lay it down (see fig. 5).
The control box may only be opened if there is no risk of
moisture precipitating on the control unit.
Drying system control box
Fig. 5: Control box (opened) of
drying system with switches 1 , 2 , 3
Fig. 6: Switch for setting the drying
system
Changing settings