Automated Fuel Control Service Manual
This manual covers installation, setup, operation, and troubleshooting of the AFC. Installers should familiarize themselves with the entire text; end-users should be concerned mainly with the software section.
Lethal voltages are inside the AFC cabinet! Do not attempt to install, troubleshoot or repair the AFC hardware unless you are a certified installer or electrician and are familiar with fueling systems and wiring. End-users should contact a trained service technician whenever service is required.
Within the text portion of this manual, the term pump refers to the fuel pump or fuel dispenser the user obtains fuel from; it does not pertain to the mechanical pump and motor used to move the fuel from the tank to the hose. The actual pump motor and cabinet wiring is shown in the suggested-wiring diagrams in the appendix of this manual.
System Components
The operational components of the system include the following:
Central Processor Unit (CPU) board
This board controls the AFC. It contains an EPROM that stores the AFC program (firmware) and contains NVRAM modules that store the general system settings, as well as the card/key settings and driver/vehicle settings. These NVRAM modules also store the transaction information. Modules contain an internal battery, so data is retained even if they are removed from the CPU board.
The CPU board also communicates with the key or card reader and keypad and controls the LCD screen, LCD heater, and Interconnect Boards. In addition, it provides communication with the printer/PC adapter and Remote Communications Adapter. Status lights on the CPU board show whether communication is taking place and whether the LCD heater is on.
LCD Screen Assembly
The display shows messages and prompts the user for information during the fueling process. It is connected to the CPU board and to the display heater board (see below) via a ribbon cable that is permanently attached to the LCD screen assembly.
Display Heater Board
This board contains the display heater circuitry, which allows the display to function normally in cold weather. It also provides nighttime illumination for the keypad, card reader, and DuraKey™ reader. It connects to the CPU board via the LCD screen assembly cable.
Interconnect Board (ICB)
Each Interconnect Board contains all of the circuitry necessary to control one or two positions on single-hose or multi-hose mechanical pumps or dispensers. The relays on this board switch power to the dispenser to activate it. The in-use terminals are used to signal the AFC that the pump is on, and the pulse inputs count the quantity of fuel dispensed. Status lights on the ICB indicate whether each hose is authorized, in use, and receiving pulses.
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