Existing solenoids and wiring harnesses can be retained. It’s an easy upgrade for owners of AIM Command & SharpShooter systems because these already have most of the components, and install times are therefore lower for these machines. EVO provides new modules and a new screen, but users save money because they can keep their existing solenoids, says Capstan.Ĭapstan says that EVO is for every brand of sprayer ordered without pwm control from new to 15 years old. Repeated year-after-year under-dosing at the periphery of a turn such as field corners, or around permanent features such as sloughs, trees, or stone piles results in weed problems.ĮVO is intended for users with an original SharpShooter or AIM Command who would like turn compensation but don’t want to a whole new PWM system. Recall that it’s more important to be accurate on the outer wing than on the inner, for the purpose of delivering the full spray dose in a turn. On an uncompensated boom with the same dimensions, the outermost nozzle would be under-dosing 38% and the innermost nozzle would be over-dosing by 267%. Spray deposition on an un-compensated turn. Moving from the centre of the sprayer to the inner wing, deviations are 9% under and 12% over, then 12% under and 16% over, and finally 16% under and 24% over. On the next section, these deviations are 7% under and 8% over, then 8% under and 9% over. In this example, the outer section’s end nozzle under-applies by 6% relative to the ideal, and the innermost nozzle on this section over-applies by 7%. Its performance will depend on the size of the sections.įor a 100′ boom with six 10-nozzle sections turning around an object with a 60′ diameter, our modelling shows that the deviation from perfect turn compensation is least on the outer wings (where it’s most important) and grows towards the inside of the turn. Each section will have a fixed turn compensation based on the speed of the centre of the section. Turn compensation is part of EVO, and this is an important benefit that was previously only available in more expensive versions of a PWM product. As always, some lateral movement of spray from adjacent nozzles will occur. Spray dosage for sectional turn compensation for six sections of equal size, with the centre of each section applying the target dose. Technically it’s possible to add sections, but the rate controller and the sprayer wiring would have to allow it. With the EVO, the shortcut is that sectional control is by plumbed section. Drift or coverage are controlled by the operator who makes changes to spray pressure from the cab, with a commensurate background adjustment in duty cycle so that travel speed is unaffected. This provides the consistency in performance that we love about PWM. As a bonus, a complete new EVO install on non-PWM sprayers is available at a significant discount compared to most other PWM products.ĮVO features many of the same basic PWM capabilities as its bigger cousins, but with a shortcut, explain Capstan representatives.Īs always, a change in travel speed changes the duty cycle of the pulsing solenoid, adjusting flow rate of the nozzle without a change in pressure. Introduced in January of 2019, it gives older AIM Command units affordable turn compensation. And of course, sprayers that lack PWM alltogether, possibly because of cost. But there remains a large base of older AIM Command units that lack turn compensation. The latest versions (AIM Command Pro and PinPoint) offer turn compensation and individual nozzle sectional control. Note the darker dye on the innermost nozzles and lighter deposits on the outer wing. A sprayer turn, without turn compensation. If you’re new to the concept, read about it here and here. Over the past 20 years, it has become commonplace on Case sprayers as AIM Command and AIM Command Pro, and as an aftermarket product, called Sharpshooter or PinPoint, on any brand sprayer. Capstan Ag brought Pulse Width Modulation (PWM) to spraying in the mid 1990s.
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