Syn-Tech Systems FuelMaster FMU-2500 Classic Installation Manual page 153

FuelMaster Installation Manual
®
Presets
: when the FMU is accessed to start a transaction, the customer is afforded the opportunity to
preset a dollar or gallon limit (the preset question may be turned off in newer firmware, if desired, or if
equipment to support presets is not installed). If a preset dollar or gallon limit is set, the transaction must
end exactly at that preset amount. The fueling customer is prompted by the FMU to select an
authorization method of dollars or gallons, then a preset quantity limit based on the authorization method
selected (example: customer selects dollars, then 35. The preset is $35).
To make the transaction end exactly at the preset amount, the dispensing equipment must be equipped
with a two-stage valve, and the FMU must be configured accordingly with a setpoint setting. The setpoint
is the point at which the fast valve shuts off before the slow valve finishes the transaction. The setpoint
may be set differently for each hose. Section 4, Installation, paragraph 6g, and Figure 4-12 describe
wiring two-stage valve control.
Two stage valve control reduces the number of hoses which may be controlled to four. The FMU uses two
relay assemblies to effect two-stage valve control. The left relay assembly controls the slow valve, and
the right relay assembly controls the fast valve. Both valves open at the same time. The fast valve shuts
off at the setpoint setting, and the transaction ends with the slow valve.
Uninterruptible Power Supply (UPS)
: a retail fueling operation must be capable of completing
the transaction in the event of a power loss after the transaction is started. Handbook 44 requires the
FMU maintain power for 15 minutes after a power failure to complete the transaction and provide the
customer a receipt. This may be accomplished through the use of an uninterruptible power supply (UPS).
A UPS with a 500VA (or higher) output will maintain power on the FMU for 15 minutes. If the FMU is
wired for pump handle detection, a receipt will be printed as soon as the power fails. The FMU sees the
power failure as an end to the fueling transaction.
NOTE
In addition to the connections in the UPS that offer uninterruptible power, most have additional plugs
which are merely a pass-through; they require power to be applied to the UPS for power to be available
on those plugs. Ensure the FMU is plugged into an uninterruptible receptacle rather than a pass-through
receptacle, or power will go off at the FMU when power is removed from the UPS. After the UPS has
been charged, this may be tested by disconnecting power to the UPS and ensuring power remains on the
FMU.
In tests we have performed, the FMU never reset when powered through a UPS. If the FMU does reset, it
will be necessary to enable RCPTS PRINT ON PWR UP in the FMU to ensure a receipt is printed.
Setup Considerations for System Reliability
The fueling equipment at many small airports may not include an automotive type fuel dispenser with a
pump handle switch that has to be turned off before the fueling nozzle can be hung up. Even if it does
include an automotive type fuel dispenser, the long fueling hose required for this application is most likely
on a hose reel, and the nozzle is not hung up on the dispenser. As such, it is very easy for a fueling
customer to forget to turn the pump switch off. The pump switch should be wired in such a way if the
customer forgets to turn the switch off, power to the switch will still timeout when the pump finish timer
times out. This will preclude a pump motor from being left on too long and burning out. Wiring power to
the pump or pump switch from LD will ensure power turns off when the pump finish timer times out.
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