Wheel System, Traction185Service Manual
SC6500|an additional dedicated wire for this circuit and it works in the same way as the “Motion” circuit. When thevehicle is moving forward, the switch is open and the input is high. When the vehicle is moving in reverse,the switch closes, causing the input to go low.Fault CircuitThe wheel drive controller informs the “main” (A2) Control Board when it has set a fault code using a singlewire that functions much like the motion and direction circuits.Mode 1 and Mode 2 CircuitsThe (A2) “main” Control Board informs the wheel drive controller how it wants it to control the drive wheelusing two circuits “mode 1” and “mode 2”. Each circuit is a logic circuit where the voltage is either low orhigh. The drive speed is normally slowed down while scrubbing unless the operator chooses to press thescrub speed switch to increase the speed. The operator can also request reduced torque and speed on slipperysurfaces using the traction control switch.PotentiometerThe drive pedal has a three wire potentiometer attached to its side. The potentiometer tracks the angle or“position” of the drive paddle. The A1 Wheel drive controller supplies a 5 volt potential across the resistivestrip of the potentiometer on the “POT high” and “POT low” wires. The “POT wiper” circuit returns a portionof the voltage back to the A1 wheel drive controller as an analog input which is proportional to the positionof the pedal. The potentiometer is part of a new drive pedal assemble and comes pre-adjusted from thefactory.Motor Temperature SensorThe motor temperature sensor is a negative temperature coefficient thermistor It has two wires. Oneis connected to battery negative inside the wheel drive controller. The other is a 5 volt supply througha resistor from the controller. The controller reads the voltage between the internal resistor and thetemperature sensor.Input+ 5VB-Temperature SensorWheel Drive Controller Wheel Drive Motor
