Installation manual

FuelMaster

Installation Manual

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pulsers are with two or three conductors. All mechanical pulsers will require a 12 VDC input to return

a 12 VDC pulse for the FMU. Many will also require a third conductor connection to 0V ground, or

common.

CAUTION

Some open collector pulse generators such as the Gasboy Pump I/F Board cannot accept a direct 12 VDC

input. Applying 12 VDC directly to the Pump I/F Board will damage it.

ATTENTION

Certains générateurs d'impulsions collecteur ouvert comme la pompe, je Gasboy Conseil / F n'acceptera

pas une entrée 12 VDC directe. Application 12 VDC directement à la pompe, je / F Conseil sera

l'endommager.

Some pulse generators are open collector. They require a power input on the pulse return line before

a pulse may be generated. Open collector pulsers will also require a pull-up resistor. The pull-up

resistor carries a reduced voltage from the 12 VDC output to the pulse return line. The size of the

pull-up resistor will vary depending on the amount of power needed to generate a pulse. Figure 4-21

is an example of a connection to an open collector pulse transmitter using a pull-up resistor. The

Dispenser Compatibility List in Appendix B identifies the correct applications for pullup resistors.

CAUTION

Do not connect more than 12 VDC to J4, J5, J6, or J7. Voltages greater than 12 VDC will damage the

Pedestal I/O Board.

ATTENTION

Ne connectez pas plus de 12 volts courant continu à J4, J5, J6, ou J7. Plus de 12 volts courant continu

endommageront le tableau Dedans/Déhors du piédestal.

a. Determine the pulser wiring requirements by comparing the selected pulser with wiring diagrams

4-12 through 4-18.

b. Pull a cable with enough conductors to make the necessary pulser connections.

c. Connect the 12 VDC pulser power feed to the +12V pin closest to the applicable P_ (P1 for hose

A, P2 for hose B, etc.) pin. If a pullup resistor is required, install the pullup resistor between +12V

and P_.

d. Connect the 12 VDC pulse return to P1 for hose A, P2 for hose B, etc.

e. Where required, connect the pulser common to 0V.

NOTE

The maximum number of pulses that may be counted by the FMU when a PULSE FILTERING dipswitch is

turned on is 9000 per minute. Determine the number of pulses by multiplying the flow rate (i.e., 10

gallons/minute) times the divide rate (i.e., 100:1). If PULSE FILTERING is not turned on, the maximum

number of pulses increases to 120,000+ per minute.

f. If the pulser wires are pulled in the same conduit with AC control wires, and the pulser wires are

not shielded, turn on the applicable PULSE FILTERING dipswitch on the Satellite I/O Control

Board to prevent AC bleedover into the pulser wires.

g. Repeat steps a through f for each additional pulser to be installed.

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