Gasboy CFN Islander II - Manual (Page 29)

CFN Series System
3-2 03/07/03
POWER REQUIREMENTS
System/Peripheral Equipment
AC power for the CFN system components, data terminal, and external modem must come from a
separate, dedicated circuit breaker. No other equipment, including the system’s pumps or remote
dispensers, may be powered from this breaker. Whenever possible, one breaker should be used
to supply the CFN system components, data terminal, and modem. However, it is acceptable to
supply the power to the different CFN system 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. An unstable power source may require
the use of a power conditioner. See Section 2, Power Conditioner for installation information.
Proper system grounding is an extremely important part of the system installation. As with the AC
power, the grounds for all CFN system 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
RS-485 data loop 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.
WIRE SIZE
The AC wire size for power of the CFN system components 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.
The specifications for the RS-485 data loop and RS-232 and RS-422 communication wire/cable
size can be found in Communication Requirements (RS-485) and/or Short Haul Modems (RS-
422) later in this section.
COMMUNICATION REQUIREMENTS
The CFN System utilizes RS-485, RS-232, and RS-422 modes of communication for
communicating to other CFN system components and peripheral equipment. The Islander has six
ports: two are RS-485 and are dedicated to communicating with other CFN components; the other
four can be individually set up for use with a terminal, modem, or PC and can be RS-232 or RS-
422. Phone line (modem) communication may also be used when remote communication to the
site is desired. In cases where an Islander internal modem is used, the port connected to the
internal modem is not available for external communication wiring. The specific requirements for
each of these modes of communication are listed below.
RS-485
RS-485 wiring is used for communication between the CFN system components. This
communication takes place over the RS-485 modular cables provided with the system
components and the RS-485 data loop field wiring. The following installation requirements must
be followed when installing the CFN RS-485 communication lines: