Installation manual

FuelMaster

Installation Manual

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a. Dual Output Pulsers. Pulsers are available with dual outputs; pulsers which provide outputs to

two different devices such as an FMU and a tank monitor. An application which may require a

dual output pulser is a system having both an FMU and a TLS-350R Veeder-Root tank monitor.

Pulses from the fuel dispenser are needed by both the FMU and the TLS-350R. Single output

pulsers have supported some similar applications, but may not under all circumstances. If

working with existing equipment with single output pulsers, test the outputs from the single

output pulsers first. If the single output pulser won’t support both applications, switch to a dual

output pulser.

b. Opto-Isolators. Before electronic dispenser interfaces were adapted to FuelMaster

, several

different optical isolators were developed to receive pulses from some older electronic dispenser

applications such as the Gilbarco Advantage and Legacy, the Tokheim 262, the Wayne 360/370

series dispensers, and some Schlumberger models. These optical isolators were designed to

support commercial fleet operations and did not attain the accuracy required by Weights and

Measures for retail operations. The optical isolators also provided for a reduction of pulses

through “divide by” circuitry which could divide the number of pulses received by 1 (no

reduction), 2, 4, or 8.

c. Counts During Reset. 12 VDC pulser power from the FMU to a pulser is constant whenever the

FMU power switch is on. This can result in “counts during reset”; pulse counts generated when a

mechanical dispenser resets. If this occurs, it may be eliminated by wiring pump handle

detection and setting the USE PUMP HANDLE setting in the FMU to START or START AND

END (Plus systems), or YES (Classic systems). If pump handle detection may not be wired or

set to these configuration options, two other methods are available to eliminate counts during

reset. One option is to install pulsers with 110 VAC connections. The other option is to install

mechanical relays to control the 12 VDC pulser power. Relays with 110 VAC coils and 12 VDC

switching are necessary. Install the relays so the 12 VDC power to the pulser is interrupted by

the relay, and controlled by a 110 VAC input from FMU authorization (LD_).

d. AC Bleedover to Pulse Inputs. AC control wires and DC pulser cables may be pulled within the

same conduit if the DC pulser cables are shielded and insulated to the maximum voltage in the

conduit. The NEC allows for this and specifies the requirement for cable insulation in NFPA 70,

para 522.24(A). Syn-Tech Systems further specifies the pulser cable be shielded. Bleedover

from AC control wires to DC pulser wires should not occur when these conditions are met. If it

does, ensure the PULSE FILTERING dip switches on the Satellite I/O Control Board are turned

on for each applicable hose position (read the hose positions from the silkscreen on the board,

not the dip switch block). When the PULSE FILTERING dip switches are turned on, the pulse

Figure 4-21. Connecting to Open Collector Pulser

(Gasboy 9800 Pump I/F shown)

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