Installation manual

FuelMaster
®
Installation Manual
50
the beginning of the transaction but detects the turn off at the end of the transaction.
AIM2™ scenario: an AIM2™ passive transaction does not require someone to start their
transaction at the FMU. Instead, they park their vehicle next to the dispenser, take the fuel nozzle
down, turn on the pump handle, insert the fuel nozzle into the fuel tank filler neck, and pump fuel.
AIM2™ fueling scenarios ignore pump handle detection. Something which must be kept in mind is the
backup scenario should AIM2™ not be installed on all vehicles in the fleet. Those vehicles will still
need the FMU configured as it should be for a vehicle using an access method other than AIM2™.
What about the NO or NONE settings?: pump handle detection, except in DoD systems, is
not always required. There may not be any receipt printer, and the layout of the servicing site may not
lend itself to passing off an active fuel nozzle to another customer. If this is the case, pump handle
detection need not be wired and the FMU may be configured with NONE (in Plus systems) or NO (in
Classic systems). In either case, there is no pump handle detection at the beginning or end of the
transaction.
Controlling counts during reset: the +12V pulser power positions on J4 through J7 of the
Pedestal I/O Board are powered whenever the FMU has its power switch turned on. As a result, some
mechanical dispensers with mechanical pulsers may generate pulses as the meter resets to zero.
Over several transactions this could result in recording a significant quantity of non-existent fuel. In a
retail operation the fueling customer could be charged for fuel he/she didn’t receive. This can be
avoided through pump handle detection. If YES (with Classic systems) or START ONLY or START
AND END (with Plus systems) is used, any pulses generated during the dispenser reset cycle will be
thrown out in the transaction recorded by the FMU. All other pump handle detection options (NO,
NONE, or END ONLY) will save those unwanted pulses.
When it is not possible to make a YES, START ONLY, or START AND END pump handle detect
setting to remove unwanted pulses during reset, other options may be used to achieve the same
results. Pulsers such as the Integrated Control Systems (ICS) SP1 110 VAC pulser, or OPW Model
500 with 110 VAC switching circuits in them will not allow pulses to return to the FMU until an
authorization signal is sent to the dispenser. Authorization is not sent until dispenser reset is
complete.
Another option is to install a relay to interrupt the +12V output to the pulser. Install a relay to interrupt
the +12V output and use the authorization output from LD to activate the relay. In this instance, +12V
to the pulser is not provided until authorization power has been sent from LD. Authorization is not sent
until dispenser reset is complete.
Control Methods
CAUTION
If constant AC dispenser reset power is delivered to the FMU, the Automatic/Manual Mode Switches in
the FMU should be placed in Manual only for the duration of the transaction, then returned to
Automatic. Failure to remove the Automatic/Manual Mode Switch from Manual will result in constant 110
VAC power delivery to the solenoid valve/pump motor, and potential for early burnout of the solenoid
valve/pump motor.
ATTENTION
Quand le FMU reçoit constantement des impulses interrompés du courant alternatif, les commutateurs de
mode d'Automatic/Manuel du FMU devrait être mises en manuel seulement pour la durée de l'opération,
alors retournée à automatique. Défaut de retourner le commutateur de mode d'Automatic/Manual à
automatic aurá comme conséquence l'alimentation de courant alternatif de 110 V constante à la valve
solénoïde/moteur de la pompe, et le potentiel du grillage rapide de la valve solénoïde/moteur de la
pompe
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