Model 9600/9700 Swing-Reach ® Lift Truck
Section 8. Theory of Operation System Architecture internal programming. The TPA also checks the operation of the Traction Power Contactor (TPC), the pre-charging of the amplifier, and various internal operating parameters. It also sends fault codes to the TM if anything is operating incorrectly. A copy of the vehicle identity is stored in the TPA.
Lift Power Amplifier The Lift Power Amplifier (LPA) communicates with the TM via BUS0. It receives all lift/lower speed commands. The LPA monitors both the Lift Motor Encoder (LME) and Lift Motor Temperature (LMT) sensors. It determines, from the encoder feedback and lift/lower request, if the motor has achieved the commanded speed request. The LPA solely controls Lift Motor current. It sends Lift Motor temperature to the TM. The TM determines if the motor must be limited due to motor temperature. The LPA monitors its internal temperature and limits current or lift speed as required by its internal programming. The LPA also checks operation of the Lift Power Contactor (LPC), the pre-charging of the amplifier, and various internal operating parameters. It also sends fault codes to the TM if anything is operating incorrectly.
Display Interface Card The Display Interface Card is connected to the BUS1 communication line. The display has internal software (Graphics Database Download) that allows it to control the display module. A back-up copy is stored in the TM. The Display Interface Card communicates with the TM only. A jumper installed at JPD5 determines the baud rate for BUS communication. Correct placement of the jumper is required to avoid communication error codes. For jumper location, see “Display Interface Card” on page 5-13.
Guidance Manager The Guidance Manager (GM) communicates with the TM only. The learned values for wire guidance are stored in the GM. It determines the position of the truck relative to the wire when in the guided mode. The GM uses inputs
8-4
from the Filter Card to calculate the position of the truck relative to the guide wire. It then reports the truck position along with a command for steering direction to the TM via Bus0.
Systems Overview Vehicle operation is accomplished via the following systems: •
Lift/Lower
•
Traction
•
Load Handler
•
Steering/Guidance
Lift/Lower The following components control the Lift/ Lower system: •
Tractor Manager - determines the rate of lift or lower request sent to the LPA based on multiple inputs and controls the hydraulic solenoids to determine main or mini-mast movement. The TM calculates the height of the main and mini-mast to determine lift and lower deceleration points.
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Lift Power Amplifier - monitors and controls the LPC and Lift Motor so that varying lift and lower speeds are obtained.
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Carriage Manager - input for the pedal switches, lift/lower pot, lift select switch, and the Mini Height Prox switch.
Traction The following components control the Traction system: •
Tractor Manager - determines the direction and rate request sent to the TPA based on multiple inputs.
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Traction Power Amplifier - monitors and controls the TPC and Traction Motor so that direction and speed requests are obtained.
•
Carriage Manager - provides input for the pedal switches, travel pot, and calculates Load Handler position.
Publication: 1089040, Issued: 08 Apr 2016
