Section 8. Theory of Operation

Definitions

Definitions

Acceleration

The process where the truck’s acceleration characteristic is determined when the truck starts from a stop. This is a driver parameter (Acceleration). The range is from 30% to 90% in increments of 5%. Default is 80%. A lower number gives less aggressive acceleration.

Arm Angle Proximity Switch

The Arm Angle Proximity Switch sends a signal to the Traction Amplifier which then in turn determines brake activation and truck travel. The proximity switch determines control handle position by sensing the presence or absence of metal at the handle base. The control handle must be positioned between B1 and B2 of the operating range to permit travel. See Figure8-1

Figure 8-1.Arm Angle Proximity Switch and Brake Actuation

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Click-to-Creep

Click-to-Creep enables creep speed travel with the control arm in the fully raised position. “0”disables the option and “1” enables the option. The default setting is “0”.

Activate click-to-creep by quickly clicking the speed control in either direction twice with the control arm in the brake position. “SLO” blinks on the display when in click-to-creep mode.

Deactivate by clicking the speed control twice more. Click-to-Creep mode deactivates automatically after 10 seconds or immediately if the Emergency Reverse (belly button) switch is pushed.

Continuity

A continuous and uninterrupted path between two or more locations in an electrical circuit, typically having a resistance of less than 1 ohm.

Controller Area Network (CAN)

Motor controller functions performed by the electronic circuitry (VM) and Traction Amplifier (TA) are communicated in the truck through this network.

Creep Speed

Creep speed defines speed at low throttle positions. Creep speed range is adjustable from –10 to 10. The factory default value is –5. A negative number enhances low speed maneuverability. A positive number makes the truck more responsive.

When the control handle is in position B1, the parking brake is activated. When the control handle is moved to position T1, the brake disengages and enables travel. When the control handle is placed in position B2, the parking brake is activated.

Current Limiting

Current Limiting is a protective function of the traction amplifier that prevents excessive current levels from damaging drive components.

8-2Publication: 1146947, Revised: 12 Jan 2017