horsch Leeb 5.280 VL, Operating Instructions Manual

Page: 195 / 308

Pulse width modulation
(PrecisionSpray)
Pulse width modulation (PWM) is used to regu-
late the wash more precisely. The flow rate is
thereby regulated by rapid opening and closing
of electrically controlled nozzle valves. As a
result, different quantities at the same pressure
and the same drop size are placed with the
same spraying nozzle. The application quantity
remains unchanged.
1
2
3
1 Pulse nozzle switching valve
2 Status light
3 Nozzle carrier
Pulse width modulation is possible with the fol-
lowing nozzle controls:
•
1-0 with triple nozzle body, manually
•
1-1 with triple nozzle body, manually
Design of pulse nozzle switching valves
1
2
3
4
5
6
1 O-ring
2 Outlet seal
3 Valve body
4 O-ring
5 Valve piston with closing spring
6 Locking cap
Maintenance
Valve piston (5) new (left), worn (right)
NOTE
Replace worn valve pistons every 500 h or as
needed according to manufacturer’s specifica -
tions!
Always use an auxiliary pressure filter when
additives, such as salts, are placed to protect
the valve piston from foreign objects.
Clean the pulse nozzles regularly, especially
when using powdery crop protection agents. To
clean the nozzles, disconnect and open them
using the tools supplied in the accessories pack
(Art. No. 60009829).
Opening the nozzle control valves
190 191