Revision A9 17
GRT Avionics Mini-X Installation, Setup & User Manual
2.2 General Wiring Guidelines
Wires that are certain to be used are pre-installed in the Mini cable assembly connectors. Optional
connections to the Mini are not installed in the D-sub connectors at the factory, however, colored
aviation-grade wires with pre-installed D-sub connector contacts are included for these connections.
The cable description diagram includes recommended wire colors for each connection to the Mini’s
components.
When routing the wiring, the following guidelines should be considered:
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Good practices for physical installation of the wiring should be followed, such as grommets where
wires pass through sheet metal, considering for chaffing and interference with moving
mechanisms, etc..
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Cable lengths should include enough extra length to allow for servicing the equipment. For
example, the cables which plug into the display unit should be long enough to allow them to be
connected to display unit with the display unit not installed in the instrument panel.
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In general, routing of the wiring is not critical, as the Mini is designed to be tolerant of the electrical
noise and other emissions typically found in aircraft. Some consideration should be given to avoid
routing wires near antennas, or other locations that could impart high levels of electromagnetic
signals on the wiring.
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The checkout procedures outlined in Section 4 must be completed to verify the Mini is not affected
by radio transmissions on any frequency.
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Consider the effects of individual component failures in the design of the system as a whole to
create redundancy where necessary.
2.3 Power Connections
Power Switch–
No provision is included within the Mini for a power switch. If a power switch is
desired for the Mini, the +12V power should be controlled with the switch (not ground). It is
desirable to have the Mini power off during the engine start if the bus that powers it is used for
supplying power to the engine starter. Voltage drops during engine start can cause the Mini to
reboot. An installed backup battery will dampen this effect, but it is good wiring practice to isolate
EFIS avionics from the starter circuit.
Circuit Breaker–
Power supplied to the Mini must pass through a fuse, circuit breaker, or system
such as a Vertical Power electronic circuit control system. It should be sized to allow at least 1/2
amp. At full brightness, the Mini consumes approximately 1/4 amp. The Mini contains internal
thermally-activated fuses to protect the equipment from internal electrical faults.
