Gasboy Atlas Fuel Systems Installation Manual - Manual (Page 20)

Control Lines for Atlas Electronic Series Micro Feed
Page 4-2 MDE-4331M Atlas® Fuel Systems Installation Manual · September 2014
Micro Feed
The micro feed is a 115 VAC (230 VAC international) input required to power the
microprocessor of the register’s electronics. This power must always remain on and must be
on a separate breaker from control lines (control/pump motor feed or control/submersible
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feed - side 1, side 2). It must also be on a separate breaker from fluorescent lights to reduce
electrical noise and allow separate control of lights. In a site configuration using multiple
dispensing units, the power for microprocessors of up to eight units can be supplied by one
breaker (except cold weather DEF units). This line also supplies power to the optional
TopKAT PLUS. If this unit is equipped with a TopKAT PLUS option, for wiring requirements
and information, refer to MDE-5013 TopKAT PLUS Installation Manual.
The cold weather DEF unit’s internal heater can share the micro feed AC line and neutral
circuit. These units must not share breakers with other dispenser.
Micro Neutral
The micro neutral is a return line for AC from the microprocessor of the dispensing unit to the
breaker panel. This line also serves as the return for the optional TopKAT PLUS.
Auth/Pump Motor Feed (Self-contained Pumping Units)
The auth/pump motor feed is a 115 VAC (230 VAC international) input that is required to
power and authorize the auth control line. This line is used to provide authorization for the
self-contained pumping unit (when enabled, refer to MDE-4334 Atlas Start-up/Service
Manual). If this line is controlled by an FMS using solid state relays, a resistor assembly must
be installed between the auth feed line and feed neutral to prevent false triggering of the
authorization input. The resistor assembly is 8.2 K Ohm, 10 W (part number C05818) for
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115/230 VAC domestic; and 30 K Ohm, 10 W (part number C06683) for 230 VAC
international wiring. Two auth/pump motor feed lines are provided for twins.
Note: The auth/pump motor feed is not required for the TopKAT PLUS system.
The auth/pump motor feed line is used to power slow flow and fast flow valves (when
installed). The power used to control the pump is also provided by this line. It is possible to
combine control lines for twins and supply them from one breaker. However, the gauge of the
wire must be adjusted to handle the load of two motors. The reset complete signal used for
external monitoring of the pump also originates from the auth/pump motor feed line.