Theory of Operation

GreenStar™ Rate Controller is a flow-based system that controls product application on pull-behind sprayers, self-propelled sprayers, liquid fertilizer tools, NH3 tools, and planters. The application target rate is operator defined and stored in the GreenStar™ Rate Controller.

The controller utilizes flow meter feedback and ground speed using global positioning system (GPS), Radar, or wheel speed in calculating the application rate. The controller uses this calculation to make system adjustments to achieve target rate. The controller signals the valve to open or close and integrates with the existing product delivery system pump to increase or decrease product amount applied. An optional pressure sensor can be installed to monitor system pressure on the GS3 2630 Display. Rate controller cannot use the pressure sensor to adjust application rates.

The rate controller is designed to turn implement on and off using coverage, boundary, and GPS information to work with John Deere Section Control.

(Reference GS3 2630 Display Operator's Manual for details on Section Control.)

The controller does rate smoothing. Rate smoothing removes small fluctuations in application rate values shown on display. If actual value is within a user-defined percentage of target value, target value is displayed. Percentage range is 3–15% and system defaults to 3%.

Planters Only:

GreenStar™ Rate Controller can communicate with SeedStar™ controllers to control engagement of hydraulic variable rate motors on select planter configurations. GreenStar™ Rate Controller can also control electronic row clutches.