Hardware Installation Guide 13
Wheel Angle Sensor
wheel. The AutoFarm right and left steering hoses are teed into the machines steering lines and sends oil directly to the
steering cylinders. The non reactive Orbitrol keeps the steering wheel stationary while AutoSteering.
Wheel Angle Sensor
The AutoFarm wheel angle sensor measures the position of the steered wheels on the vehicle and provides wheel position
feedback to the GPS steering controller. The sensor is a 3-wire potentiometer with an electrical rotation angle of 120 degrees
and a mechanical rotation angle of 180 degrees. The wheel angle sensor should be installed and adjusted to rotate
approximately 90 degrees when the wheels turn from lock to lock. The amount of rotation on the wheel angle sensor is
determined by the length and geometry of the threaded linkage rods.
Table 2-1 Potentiometer Resistance and Counts (typical values)
SA Module
The AutoFarm SA Module is an electronic enclosure that is permanently mounted to the machine and connects the AutoFarm
GPS steering controller to all AutoFarm sensors and actuators. The SA Module receives sensor inputs from the wheel angle
sensor and the AutoFarm steering valve pressure transducer and outputs electrical signals to the AutoFarm steering valve to
steer the vehicle. The SA Module communicates with the AutoFarm display and the GPS roof module through a proprietary
CAN bus.
Rotation (degrees) Resistance (Ohms) Encoder Counts
0 790 16
20 1580 693
40 2370 1371
60 3150 2048
80 3940 2725
100 4730 3403
120 5520 4080
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