Syn-Tech Systems FuelMaster FMU-2500 Classic Installation Manual page 57

FuelMaster
Pulsers may provide quantity information in common increments referred to as divide rates. The most
common divide rates are: 1:1 (one pulse per gallon), 10:1 (10 pulses per gallon), and 100:1 (100 pulses
per gallon). The unit of measure may be something other than gallons. The FMU and FuelMaster
software may be programmed to record units of measure other than gallons, and any divide rate using
whole numbers.
Do not wire 110 VAC into pulse return in the FMU. Pulse return is designed for a 12 VDC input.
Wiring 110 VAC into pulse return will damage the Pedestal I/O Board.
Ne pas câbler 110 VAC en retour d'impulsion dans l'UFA. Retour Pulse est conçu pour une entrée de
12 VDC. Câblage 110 VCA en retour impulsion endommager le I pied / O Board.
FMUs provide a 12 VDC feed to pulsers, and are designed to receive a 12 VDC pulse return. Any voltage
greater than 12 VDC may damage the FMU, and any voltage less than 12 VDC may not return pulses
recognizable by the FMU.
The 12 VDC feed to pulsers is constant whenever AC power is being applied to the FMU. It is not
switched on and off with authorization. As such, it is possible to receive false "counts during reset", pulses
generated and counted when a mechanical dispenser is resetting. See Pump Handle/Switch Detection,
Controlling counts during reset, in this section to remove or control counts during reset.
Pulse Filtering:
DC pulser wires and AC control wires may be routed through the same conduit
providing all wires are insulated for the maximum voltage routed through the conduit. When routed
through the same conduit, the pulser wires should also be shielded to prevent bleedover from AC control
wires into the DC pulser wires/cable. Should bleedover occur, the FMU has provisions for removing the
bleedover. The FMU Satellite I/O Control Board has a bank of eight PULSE FILTERING dipswitches, one
for each of eight hose positions. When these dipswitches are turned on, they filter bleedover from AC
wires into DC pulser wires/cables. The maximum number of pulses the FMU can interpret when these
dipswitches are turned on is 9000 per minute.
If it is necessary to turn on these dipswitches, give careful consideration to the flow rate of the pump, and
the divide rate of the pulser being used. A 1000:1 divide rate will only allow for a 9 gallon per minute flow
rate (1000:1 divide rate x 9 gallons per minute = 9000 pulses per minute) while maintaining a maximum of
9000 pulses per minute.
It should not be necessary to turn on these dipswitches if 1) the pulser wires are shielded and insulated
for the maximum power carried through the conduit, or 2) the pulser wires are in a separate conduit from
any AC power wires. If the dipswitches are not turned on, the FMU can interpret 120,000 or more pulses
per minute. This would equate to using a 1000:1 divide rate pulse output with a hose pumping 120
gallons per minute.
Dual Output Pulsers
management system such as FuelMaster
Root TLS-350R. Dispensers may be equipped with pulsers with dual outputs, when necessary. Tests
have been conducted where pulses from a single output pulser in a Gasboy 9800 dispenser were shared
by both FuelMaster and a Veeder-Root TLS-350R. Where this has been satisfactory with short runs of
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pulser cable, it may not be satisfactory with longer runs or different pulser applications. It may be
necessary to use dual output pulsers when pulses from a single dispensing hose have to be shared with
two devices.
Installation Manual
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CAUTION
ATTENTION
: dispensers may be tasked to provide pulse outputs to both a fuel
, and a tank monitor/tank gauge system such as the Veeder-
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