Dynon Avionics EFIS-D10A Installation Guide - Manual (Page 15)

Instrument Installation
EFIS-D10A Installation Guide 3-3
speaker is near the EFIS-D10A. If you see a substantial change in heading, there is a
communication problem between the EFIS-D10A and the EDC-D10A.
The metal shield around the EDC communication cable is connected to the short black/white
wire emanating from the DB25. Connect this wire to ground close to the EFIS-D10A, ideally the
panel.
Power Inputs
The EFIS-D10A has three separate power inputs, located on the DB25 EFIS connector. Of the
three, only Master Power is required to operate the instrument. The other two inputs provide
redundancy. Below is a table that explains the three inputs and their purposes. All three of these
inputs share a common ground signal, wired to pin 3 on the EFIS connector.
EFIS
DB25
pin#
Function EFIS DB25
wire color
Description
1 Master
Power
Red Provides primary power to the instrument. The
EFIS-D10A will switch on upon application of
power. Connect to a switched power source. Will
not be adversely affected by engine cranking.
2 Keep Alive
Power
Yellow A very low current power input which is only
used if both Master and External Backup Power
are not applied. Keep Alive draws just enough
current to keep the clock running. It draws less
than 1 milliamp of current when not charging the
internal backup battery.
Dynon Avionics recommends not connecting the
Keep Alive wire when the EFIS-D10A has an
internal battery installed or is connected to a GPS.
Keep Alive is only used in installations with no
battery or GPS to keep the clock running when
the unit is powered off.
3 Master
Ground
Black Connect to ground. Must carry as much as 2
amps.
15 External
Backup
Power
(Not wired in
Dynon
harness)
Will operate the EFIS-D10A only if Master
Power is not present. The transition from Master
Power to External Backup Power will bring up a
warning, requiring you to press ACK within 30
seconds to keep the unit operating. This warning
will also display when transitioning from either
Master or External Backup to Internal Battery
power.