Hawkeye PWM control 2020-04-08T15:27:36+00:00
  • Sprøjtestyringer - Raven sprøjestyringer
  • Sprøjtestyringer - Raven sprøjestyringer

Hawkeye

Raven Hawkeye giver nye muligheder for præcisionssprøjtning – Hawkeye er et ISObus baseret Pulse-Width-Modulation system, der pulserer sprøjtevæsken ved den enkelte dyse ved hjælp af en hurtig magnetventil på hver dyseholder – derved varieres doseringen uden at dråbestørrelsen ændres.

Da sprøjtetrykket holdes konstant, er dråbestørrelsen uændret trods den ændrede dosering. Ændrer du doseringen på en konventionel dyse, ændres også dråbestørrelsen. Pulseringen dækker mængden fra 3-4 dyser med ens dråbestørrelse. Pulseringen sker 10 gange i sekundet og skiftevis på hver anden dyse, således at spredebilledet holdes jævnt.

Et optimalt væskearmatur har trykbaseret bomcirkulation, således Hawkeye ventilen fungerer som sektionsventil. I standard version kan Hawkeye håndtere op til 16 bomsektioner.

I HD versionen tilbyder Hawkeye sektionskontrol på enkeltdyse niveau. Hawkeye kan håndtere op til 100 dyser. Da Hawkeye er ISObus baseret, kan det bygges på de fleste ISObus sprøjter.

Hawkeye kan variere doseringen på tværs af bommen, når du svinger med sprøjten (kurve kontrol), hvorved du får en ens dosering trods forskellig periferihastighed.

Med Hawkeye kan du mere optimalt udnytte mulighederne ved variabel dosering efter tildelingskort fra f.eks. Cropsat, Fieldsense, N-sensorer eller lignende, og du sparer mange dyseskift. Hawkeye fås til standard dyseholdere fra TeeJet, Arag og Hypro.

En App giver mulighed for fjernbetjent styring af dyserne til brug for funktionstest bag sprøjten.

Se detajler på dette link.

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Best Practices
It is recommended to wait a few minutes from the time the mode is changed before resuming operation. This allows the object pool to fully load the configuration. This should also allow the system to fully clear any DTC codes and provide a green bell.

Ensure tip size is selected for an average NCV operation of 70% duty cycle. This will provide the best balance between a large speed range and best control of product. It is also not recommended to apply below a 25% duty cycle with the Hawkeye NCV.

Standard
Hawkeye will control to a target flow rate and a target pressure. This is the normal Hawkeye operating mode and is the most common setting for sprayers.

Standard mode is best for general application and controlling target pressure when operating in a narrow speed range.

This mode may be challenged by chalky or thick chemical mixes and fertilizers. You will need to closely monitor for blockage at the tips and at the strainer.

To prevent misapplication and streaking, NCV operation should be around 70% duty cycle for best flexibility. If the speed range displayed is not ideal for you, you will have to adjust tip size, target pressure, or target rate.

Variable Pressure (VP)
Hawkeye will control to a target flow rate and a target nozzle duty cycle by varying the pressure. This mode is useful for situations where pressure is not a priority. The user will only set a target rate for this mode.

VP mode is best for providing a large operating speed range and targeting 70% NCV duty cycle.

High Flow
This mode allows for both a conventional nozzle and a Hawkeye nozzle to run simultaneously in order to achieve higher flow rates. Stacked nozzles are required for this mode.
Hawkeye with Stacked Nozzles

On/Off
Hawkeye will hold the nozzle control valve at 100% open during application or fully closed when not applying. Air induction tips can be used with this setting.

This mode may be better than Standard Mode for chalky and thick chemicals or fertilizers since NCVs are not pulsing as often.

Bypass (Conventional)
Hawkeye will control to a target flow but the nozzle control valve is disabled. In order to use Bypass, an alternative flow route must be made available at each tip.

Bypass mode will spray out of a conventional tip, keeping the NCV closed. This would be used for very viscous/chalky fluids.