Installation manual

FuelMaster
®
Installation Manual
45
Uninterruptible Power Supply (UPS): Weights & Measures requirements call for a backup
power source for retail fueling operations. The customer who starts a transaction with a credit card
must be provided a receipt should there be a power failure while a retail transaction is in progress. A
UPS may be installed between the FMU and its power source (i.e., breaker panel) as a backup
power source. A 500 volt-amp UPS will provide the required 15 minutes of backup power to the FMU
under its greatest power draw (all internal heaters operating). FMUs equipped with receipt printers should
print a receipt when power is removed from the dispensing device it is controlling. The FMU reads the
power removal the same as if the pump handle switch is being turned off to end the transaction.
Of those UPS’s tested, all provided power instantaneously after a power failure. There was no delay
between the power failure and resumption of power by the UPS. The FMU did not reset. This may
not be true in all cases. If the FMU does reset, an FMU operating option (command 5b; RCPTS
PRINT ON PWR UP) must be enabled to ensure a receipt for the last transaction is printed after
power resumes.
Communications with Central Controller
NOTE
• Communications connections with the Central Controller must be made from a Master
FMU.
• Communications for the purpose of authorizing credit cards may only be accomplished
through an active phone line (analog, phone line extender, or cell modem) connection.
• The NEC states, “Communication conductors shall not be placed in any raceway,
compartment, outlet box, junction box, or similar fitting with conductors of electric light,
power, Class 1, non-power-limited fire alarm or medium power network-powered
broadband communications circuits.” Ref: NFPA 70, para 800.133(A)(1)(c).
Available options for communications with the Central Controller include: a) by phone, b) by network,
or c) by direct connect to a master FMU with a laptop.
FMU and Central Controller communications are not continually active. Except for credit card
authorization from the FMU, connection must be initiated by the Central Controller operator. When the
desired communications are complete, the connection is disconnected. Transaction downloads may be
programmed to occur automatically when the Central Controller operator is not present. Communications
to credit card networks are initiated by the FMU whenever a credit card is inserted to start a retail
transaction.
Wireless communications are becoming more practical and reliable. In many applications an FMU may be
installed and connected to nearby fuel dispensers for power, pulse, and control without trenching to add
underground conduit. Hard wire communications drive the need for a communications conduit. The
advent of wireless communications eliminates the need for trenching altogether. Wireless
communications is possible with a phone line extender or wireless networking. Whereas wireless RS-232
is a viable option for Master to Satellite FMU (and EIU) communications, and Master FMU to tank monitor
communications, it is not presently an acceptable means of communicating to the Central Controller or for
credit card authorization.
Phone/Modem Communications
Central Controller phone/modem communications with a master FMU may be through 1) analog phone
lines, 2) with a two-way ringdown device, 3) in conjunction with a phone line extender, or 4) through a cell
modem. In all cases, the FMU and Central Controller must be equipped with a modem.
Most credit card networks require a phone connection to authorize credit cards. If retail (credit card) sales
are being conducted through the FMU, an analog phone line connection will be necessary.
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