Installation manual

FuelMaster
®
Installation Manual
51
NOTE
It is recommended dispenser reset power be obtained from a separate power source, and not the same
power source as the FMU. If constant AC pump reset power is derived from the FMU power source,
current spikes or low FMU voltage may occur when the solenoid valve/pump motor is activated which
may generate power resets in the FMU.
Controlling Dispenser Reset Power:
CAUTION
When controlling dispenser reset, a specific dispensing application has been detected which could result
in a giveaway fuel situation. If controlling dispenser reset power on a dual hose single product dispenser
(two hoses with one pump motor feeding both hoses), output power from an authorized hose feeding the
single pump motor can backfeed to the reset mechanism of the unauthorized hose. If the pump handle for
the unauthorized hose was left on during a previous fueling transaction, the power from the authorized
hose will backfeed to the unauthorized hose, through the reset mechanism and out to the solenoid valve.
Once the solenoid valve is powered, all conditions necessary to pump fuel have been met, and fuel may
be dispensed from an unauthorized hose. Fuel dispensed from unauthorized hoses will not be accounted
for.
ATTENTION
Lorsqu'il est réarmé distributeur de contrôle, une application spécifique de distribution a été détecté ce qui
pourrait entraîner une situation de carburant cadeau. Si le contrôle du distributeur de puissance de
réinitialisation sur un tuyau à double distributeur de produit unique (deux manches avec un moteur de la
pompe d'alimentation à la fois les tuyaux), la puissance de sortie à partir d'un tuyau d'alimentation a
autorisé le moteur de la pompe seule peut remontées au mécanisme de remise à zéro du tuyau non
autorisée. Si la poignée de la pompe pour le tuyau non autorisée a été laissé en place durant une
opération de ravitaillement précédent, la puissance du tuyau autorisés seront remontées au tuyau non
autorisée, par l'intermédiaire du mécanisme de réarmement et à la sortie de l'électrovanne. Une fois que
l'électrovanne est alimentée, toutes les conditions nécessaires à la pompe à carburant ont été remplies,
et le carburant peut être distribué à partir d'un tuyau non autorisée. Carburant distribué des tuyaux non
autorisées ne seront pas pris en compte.
Fuel dispensers and dispensing systems are designed to internally control fuel flow and turn on or off
pump motors. One of the easiest and safest control methods is control of dispenser reset power. This
method controls the input of power to the dispenser so nothing can happen within the dispenser until
authorization is received from the FMU. It is also one of the easiest methods to wire as control is
provided by simply interrupting power to the dispenser from its circuit breaker. Internal circuits in the
dispenser don’t have to be separated to attain control of a solenoid valve or pump motor.
If pump handle detection is desired, it may only be attained to indicate when the transaction ends.
This control method typically has a constant hot (from the circuit breaker) on LN. Pump handle
detection is attained by 1) wiring a dispenser RESET COMPLETE or pump switch HOT input into PHS
(PHS1 for hose 1, PHS2 for hose 2, etc.) on the Pedestal I/O Board, 2) cutting one leg of a resistor at
R92 (for hose 1, R93 for hose 2, R94 for hose 3, etc.) to transfer pump handle detect from LN to PHS,
and 3) setting pump handle detection to END ONLY.
The only drawback to this control method occurs as noted in the CAUTION above, plus in
circumstances where pulse counts are received during dispenser reset. Pulse counts received during
dispenser reset are counted when END ONLY or NONE or NO is set in pump handle detection. This
may be remedied by using a pulser with 110 VAC control, or by installing a small relay to control the
output of +12V from the pulser connectors.
Controlling Solenoid Valves and/or Pump Motors: (see separate heading Controlling
Two-Stage Valves for controlling two-stage valves.) Some dispensing equipment may have solenoid
valves or pump motors (submersible or suction type) or a combination of both. The pump motor is
typically delivering the product to the dispenser whereas the valve is releasing it to the nozzle. One or
both may be controlled. It is important the control method selected provides for control of each
individual dispensing hose.
To provide control, the input power to the valve or motor must be found. This power shouldn’t be
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