Syn-Tech Systems FuelMaster FMU-2500 Classic Installation Manual page 55

FuelMaster Installation Manual
®
dispenser is being controlled, there will be a single pump motor. If you wired an output from LD1 and
LD2 to a single pump motor, and started a transaction by selecting only hose 1, the output from LD1
to the pump motor would backfeed to LD2 and authorize hose 2. Product could then be pumped from
hose 2 without selecting it, and without accountability of the product being dispensed.
Controlling Two-Stage Valves
:
when a credit card transaction is "preset" with a specified quantity
or cost total, the fast and slow segments of two-stage valves are separately controlled to ensure the
transaction ends at the specified quantity or cost amount. This is accomplished by using two relay
assemblies: the first to control the slow valve, the second to control the fast valve. Both valves are
opened simultaneously. The fast valve is turned off at the "setpoint". The slow valve is used to finish the
transaction.
Because two relay assemblies are used, the maximum number of hoses which may be controlled are
reduced to four. Options in the FMU firmware must be set to enable two-stage valve operation, and to set
the "setpoint". More detailed information for retail self-service operations monitored by Weights and
Measures may be found in Appendix E.
Using the FMU to automatically remove pump power
:
there are some fueling systems or
scenarios that do not require the fueling customer to turn off a pump handle to hang the fuel nozzle
back up. As such, the pump motor may not get turned off when the transaction is finished. Some
pump motors may be damaged if left to run for extended periods, particularly motors on aboveground
tanks exposed to direct summer sunlight. This may be prevented by planning control wiring so the
FMU automatically removes pump power if the fueling customer does not turn off the pump handle or
pump switch.
Authorization power from the FMU LD positions will time out if the pump handle or pump switch is not
turned off. If motor power is derived from the LD positions, the power will time out and turn off at the
end of the Pump Finish Timer setting. This is regardless of whether pump handle detection is wired in
or not. Give careful consideration to wiring pump power to FMU LD positions.
Controlling Lube Bay Hose Reels
:
control of lube bay hose reels is very similar to the control of
other types of dispensing equipment with the exception of the power source. Equipment designed for
controlling lube bay hose reels is typically 12 or 24 VDC, and an added power supply may be necessary
to power the equipment. A DC power supply may be installed in the FMU to minimize the number of wires
needed to control each hose reel.
Each hose reel will require a solenoid valve and pulser or flowmeter. Depending upon the product in the
hose reel, the valve and pulser may be designed to match the product. Antifreeze and motor oil generally
require two different types of solenoid valves and pulsers. Grease requires equipment which can
withstand high pressures, and is much more costly than similar equipment for lower viscosity liquids.
If mixed voltages (110 VAC and 12 VDC) are being used in the same FMU, the use of dual control relay
assemblies is recommended. They can control any voltage type where solid state relay assemblies must
be equipped with different relays when controlling DC voltages.
Some manufacturers who supply equipment to control hose reels are Alemite, Balcrank, Graco, and
Lincoln. Its recommended this equipment be sourced from a local distributor who can also install it. Quite
possibly the company who installed the hose reels will have a solution for the parts necessary to
automate the hose reels.
A special application referred to as Multi-Product Authorization (MPA) has been developed primarily for
activating hose reels with AIM2™. An option in the FMU firmware must be enabled. A dummy fuel nozzle
with a nozzle tag is used to start a transaction. When the dummy nozzle is inserted in the vehicle's filler
neck ring, every product authorized for that vehicle is activated. This action turns on all the hose reels
dispensing the authorized products. Only the products returning pulses are recorded. Details of this setup
may be found in Product Bulletin 169, Hose Reel Multi-Product Authorization Setup.
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