Installation manual

FuelMaster
®
Installation Manual
48
Electronic dispensers have an internal CPU (central processing unit) which controls dispenser functions. The
CPU typically requires two-wire communications inputs from a proprietary device (OEM control box) to initiate
dispensing functions and extract quantity information. FuelMaster
®
uses an Electronic Dispenser Interface Kit
to make the required connection and communicate with the dispenser CPU. Appendix H explains the
application and installation of the Electronic Dispenser Interface Kit.
Appendix B contains a sample Dispenser Compatibility List with instructions for making the FMU interface
with a majority of commercially available domestic and international fuel dispensers. This listing is updated
periodically to include any new information acquired by Syn-Tech Systems relating to dispenser interfaces.
Request the lastest Dispenser Compatiblity List from Syn-Tech Systems’ Customer Satisfaction Center for
FuelMaster
®
compatibility with the dispenser of choice.
Dispenser Control
Dispenser Control is the term used to describe how FuelMaster
®
controls the output of product from a
dispensing hose. FMUs must be installed to attain individual control of each dispensing hose. Dispensers
with multiple hoses must have a means for individually controlling each dispensing hose. In some cases
this may require the installation of solenoid valves; one per dispensing hose. The base FMU provides for
control of two dispensing hoses. Additional hose controls are optional.
Syn-Tech Systems will not dictate a control method which must be used for all situations. Instead, the
pros/cons of each control method will be explained so the installer and customer may select the
control method that best suits the application. Site layout and construction, pump handle detection,
and economics must be considered when selecting an appropriate control method. Detailed wiring
instructions will be found in the Installation section of this manual.
Dispenser control by FuelMaster
®
may best be simplified by considering the FMU a switching device
for dispenser control circuits. The FMU does not provide power for the device being controlled. It
switches existing power. The FMU installer must find a circuit in the dispenser that interrupts the flow
of fuel. This may be an interruption of power to the dispenser reset mechanism, or a solenoid valve, or
a pump motor. The interrupted circuit must be a circuit which individually controls each hose offered
by the dispenser. To gain control, the FMU is inserted as a switch for that circuit. When the FMU is not
providing authorization, the circuit is open and fuel cannot flow.
The contacts of the switch are the LN and LD positions on terminal strips TB1 and TB2 of the Pedestal
I/O Board. The LN positions are the power-in (line) positions. The LD positions are the power-out or
authorization (load) positions. There are eight positions of LN (LN1, LN2, LN3, etc.) and LD (LD1,
LD2, LD3, etc.) for control of up to eight hoses per FMU.
FMUs have timers (No Pulse and Pump Finish) which will end a fueling transaction if not otherwise
ended by pump handle detection. If the pump motor is not using a conventional fuel dispenser with a
pump handle switch,
Dispenser installation manuals may provide wiring diagrams which illustrate dispensers being
powered through multiple circuit breakers. Up to four separate circuit breakers have been noted in
manufacturer’s wiring diagrams for a dual hose dispenser. There were separate breakers for each
hose, the dispenser CPU, and the dispenser light circuit. Actual installations may have all these power
sources originating from a single circuit breaker. This means the original installer jumped power to the
applicable circuits after power arrived at the dispenser. To gain control of each dispensing hose while
maintaining constant power to the light circuit and CPU, the jumpers must be found and repositioned.
Otherwise, power may be sent to an unauthorized dispensing hose when another hose is authorized.
Whatever control method is selected, it must effectively prevent the flow of product out to the
dispensing nozzle when authorization isn’t present.
Pump Handle/Switch Detection
When choosing the best control option, consideration must be given to the use of pump handle
detection. Pump handle detection is optional on non-DoD systems, but required on all DoD FMU
installations.
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