Installation manual

FuelMaster

Installation Manual

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Table 4-1. Transaction Printer Cable Connection Points

J3 Printer 201669

EXTERNAL DB25 Cable

Pin Color

YEL (TX) 3 RED

BLU (RX) 2 BLACK

ORG (GND) 7 CLEAR

6. Dispenser Control (see Figure 4-6 for connection points on the Pedestal I/O Board). These

procedures only cover dispenser control. Additional connections from the FMU to the dispenser will

be required for pulser connections.

CAUTION

FMUs with 50 amp Solid State Relay Assemblies (SSRA) are designed to control dispensers with

pump motors at or below 3/4 horsepower, 110 VAC, or 1 horsepower, 220 VAC. FMUs with Dual

Control Relay Assemblies cannot handle loads in excess of 2 amps. Loads in excess of 2 amps

require mechanical relays or contact starters.

ATTENTION

FMU avec 50 ampères Solid State Relay assemblées (APSR) sont conçus pour le contrôle des

distributeurs avec les moteurs de pompe égal ou inférieur à 3 / 4 chevaux, 110 VAC ou 1 cheval-

vapeur, 220 VAC. FMU avec deux ensembles de commande de relais ne peut pas manipuler des

charges de plus de 2 ampères. Des charges de plus d'un ampli 2 exigent relais mécaniques ou les

démarreurs de contact.

There are several options for dispenser control. It’s important to remember the FMU is not a power

source. It should be treated as a switching device with the Pedestal I/O Board LN and LD positions

acting as the switch contacts: LN being incoming power, and LD being outgoing authorization power.

Look for a circuit in the dispensing equipment that may be interrupted by the addition of a “switch” to

prevent the flow of fuel.

Also remember, there must be a means to control each individual product hose. A dual hose

dispenser must have separate solenoid valves for each hose, or a separate pump motor input for

each hose. In some cases it may be necessary to add solenoid valves.

Compare the dispensing equipment being used to the manufacturer’s wiring diagram. It may be

discovered the installer took some liberties when installing the dispenser. Where a dispenser wiring

diagram may reference power coming from multiple circuit breakers, the installer may have sourced

all the power requirements from a single circuit breaker. Something was done in the dispenser to get

the single power source to power multiple circuits. These actions must be identified to ensure

separate control of each product hose is attained while keeping constant power on circuits which

require it.

Procedures and diagrams follow for various methods of dispenser control. The diagrams contain

broken lines to signify field wiring which must be added to gain control of the applicable dispenser

circuit. Dispenser covers and junction boxes, and the FMU pedestal door and electrical access

panels must be opened to wire all control options. If installed, I/O Silver Boards must be removed to

gain access to terminal strips TB1, TB2, and TB3 on the Pedestal I/O Board. DCRA is used to

abbreviate Dual Control Relay Assembly. SSRA is used to abbreviate Solid State Relay Assembly.

Select the control method best suited for the application:

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