60
Preparing for operation
Adjusting the ne-
gative pressure
and overpressure
The fan generates both negative pressure and overpressure. For the
correct setting for the seed concerned, please observe the following
important information:
•
The negative pressure is required in the seeding heart for singling
the seed; the overpressure is required for cleaning the seed discs
•
The smaller the seed, the less negative pressure is required
•
Negative pressure and overpressure have a mutual influence on
each other
•
An initial, preliminary adjustment is possible by adjusting the PTO
shaft speed
Adjustments also depend on:
•
Seed
•
Thousand grain weight (TGW) and
•
Velocity
Adjusting the mano-
meters
The manometer needles must be at “0” if the fan is switched off.
If the needle is not at „0“:
> Remove the rubber stopper from the glass pane
> Use a small screwdriver to turn the adjustment screw on the mano-
meter to the right or left
> Reinsert the rubber stopper
0
-20
-40
-60
-80
-100
mbar
Rubber stopper
Adjusting screw
