Section 8.Theory of OperationModel 6210 Maintenance Manual

Traction

Traction System

Vehicle Manager

The programmable motor control functions are performed by the electronic circuitry housed within the Vehicle Manager. The basic functions of the Vehicle Manager include:

•Monitor relative positioning of the thumb controls to eighteen hall effect sensors for speed and direction control.

•Monitor the position of the emergency reverse button for emergency reversing of the truck direction.

•Monitor truck performance and provide input data and commands to the service display.

•Provide lift/lower input commands to the traction amplifier.

•Monitor horn switches S18-1 and S18-2 for horn operation.

•Monitor and determine operation based on truck performance parameter settings.

•Monitor relative position of the hall effect potentiometer for lift and proportional lower control.

•Control the traction amplifier functions.

Traction Amplifier

The basic functions of the traction amplifier include:

•The direction control section controls the traction motor direction by manipulating the traction motor polarity according to the directional inputs from the Vehicle Manager.

•The speed control section controls the traction motor speed and torque by monitoring the information received from the Vehicle Manager via the CAN Bus.

•The emergency reverse circuitry in the Vehicle Manager provides the directional travel control commands to the traction amplifier.

•The control circuit section controls all truck inputs and outputs (excluding handle head inputs).