3 - Description
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DynamicFluid4 Pressure Regulation
Traditional fluid regulation starts, when the nozzles are opened. With DynamicFluid4 (DF4), the regulation is a continuous
process, even if the nozzles are closed. A synthetic or ceramic disc and a stainless steel disc regulate the pressure and ensure
quick reaction and zero leakages. Used parameters are driving speed, PTO speed and the number of activated boom
sections. The benefit is more precise application rates from the second the sprayer begins spraying.
The DF4 system is based on 5 sensors, which feed the sprayer’s computer with data necessary for optimal regulation. It auto-
primes at start-up and starts to move the regulation valve towards the final position, immediately after the operator makes
changes. For example, when section valves are opened or closed, the regulation valve is started at the same time as the
motors for the section valves are started. This prevents overpressure situations e.g. after running empty and refilling of the
main tank.
The sensors are also back-up for each other, ensuring that the system
can continue regulation - even if one or more sensor signals fails.
The applied 5 sensors measure:
1. Driving speed (km/h)
2. Pump speed (rpm)
3. Regulation valve, opening angle (degrees)
4. Fluid flow (l/min)
5. Fluid pressure (bar)
Features for DF4
• Very fast and accurate regulation when all sensors are active, setup in controller menus are correct, and pump, filters
and valves are in good condition. The system measures and calculates 20 times per second.
• Quick reacting valve, when sections are turned ON/OFF, and at speed changes.
• Optimized Auto Section Control feature that predict boom sections to open and optimized nozzle pressure.
• Optimized for different PTO systems.
• Nozzle surveillance. No setup or tuning is required for nozzle change.
• Controller display can show the current nozzle output, which can be compared with the rated output. A significant
difference in output is caused by failures occurring on boom plumbing, such as severe clogging of filters, or because
of large leakages on hoses and fittings.
• All functions work through with degraded performance (limp-home modes), if filters are cleaned.
Screen icons
The sprayer driver selects one of three modes Auto, Manual or Increment steps. The sprayer computer detects one of three
regulation modes Drop, Question mark or calibration jug. This makes 9 modes in total.
Auto Manual Increment steps
When Automatic
Volume Rate button is
pressed on the SetBox.
When one of the
Manual pressure
control buttons is
pressed on the SetBox.
When the Volume Rate
is changed in steps
with %-up or %-down
buttons on the
Terminal.
Calibration jug
There is flow to section valves.
Nozzle size (L/min at 3 bar) has been calculated.
Drop
There is no flow to section valves.
The pump is not started or the pressure SmartValve is set to other function than spraying.
Question mark
There is flow to section valves but pressure and flow has not yet been stable, therefore
the nozzle size (L/min at 3 bar) has not been calculated.
The system uses the previously stored nozzle size.
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