Gasboy Fuel Point Reader - Manual (Page 21)

System Wiring
03/28/03 3-3
POWER REQUIREMENTS
Pedestal Mount
AC power for a pedestal-mounted FPR will come from the Fuel Management System via a
GASBOY-supplied AC power cable. This means the VA rating for the entire pedestal
assembly will be the sum of the ratings on the tags for both the FMS and the FPR.
Wall or Pole Mount
AC power for the wall- or pole-mounted FPR must come from a separate, dedicated circuit
breaker rated at no less than 10 AMPS or may share the fuel management system breaker. No
other equipment, including the system's pumps or dispensers, may be powered from this breaker.
Whenever possible, one breaker should be used to supply the FMS components, data terminal,
and modem. However, it is acceptable to supply the power to the different FMS components and
accessories from multiple breakers within the same breaker panel and the same phase of
power. When necessary, power for the data terminal or modem may be supplied from a
separate, dedicated breaker located in a different breaker panel. The system requires 120 VAC +
10% 47-63 HZ for power.
Proper system grounding is an extremely important part of the system installation. As with the AC
power, the grounds for all components should return to the same breaker panel. This helps to
assure a common ground throughout the system which is necessary for protection of the circuitry.
Grounds for all system devices should be wired to the breaker panel ground bus bar which in turn
should be grounded to a ground rod. A conduit ground does not provide a sufficient ground. It is
recommended that the neutral and ground bus bars be bonded together when it is not prohibited
by local codes.
The AC wire size for power of the FPR must be 14 AWG or larger. This gauge of wire will be
sufficient for runs of up to 300 feet from the breaker panel to the system. Components with
distances over 300 feet must use 12 AWG wire or larger. All wire should be stranded. When
connecting AC power wires to FPR, keep wire slack near bottom of cabinet.
RS-485 COMMUNICATION REQUIREMENTS
RS-485 wiring is used for communication between the FPR and FMS components. This
communication takes place over the RS-485 field wiring. The following installation requirements
must be followed when installing the RS-485 communication lines:
1. All wiring must be installed and used in accordance with all building/fire codes, all Federal,
State, and Local codes, National Electrical Code (NFPA 70), NFPA 30, and Automotive and
Marine Service Station Code (NFPA 30A) codes and regulations. Canadian users must also
comply with the Canadian Electrical Code.
2. Cable: Twisted pair shielded cable is highly recommended for RS-485 wiring. Although it is
recommended that wires be run in a conduit separate from AC wires, they can be combined
in the same conduit with AC wires providing UL-Listed cable with the following specifications
is used:
Conductor: 18 AWG stranded wire. 2 twisted-pairs.
Shield: Foil-wrapped 100% coverage and/or tinned copper braid 90% coverage
Drain Wire: Stranded, tinned copper, 20 AWG or larger/or braided shield
Voltage Rating: Maximum operating voltage of 600V
Environmental: Gas- and oil-resistant; suitable for wet or dry locations.