BENDIX/KING
KAP 140
Page 4--15
Revision 2, Dec/2002
CS:15574F02.IDU
4.3.18 KC 140 POWER INPUTS
PIN
DESCRIPTION
P1401 -- 14 AUDIO_POWER
P1401 -- 15 CHASSIS_GND
P1401 -- 16 AIRCRAFT_POWER
P1401 -- 35 POWER_GND
P1402 -- 15 POWER_GND
The AUDIO_POWER input is used to provide operating power for the audio alerting circuitry. This
circuitry is powered separately from the rest of the KC 140, so that in the event of loss of aircraft
power the AP disconnect tone can be generated. The audio power voltage regulator will maintain
regulation with input voltages on the audio power bus as low as 8V; voltages over 33V are clamped
internally. The current draw from the audio power input is a 100 mA nominally with a peak current
of 200 mA. This input is usually tied to one of the emergency power buses to guarantee that an
AP disconnect tone will still be generated upon loss of the aircraft power input to the KC 140, if
the AP was engaged at the time.
The AIRCRAFT_POWER input is used to provide operating power for the rest of the KC 140 flight
computer. The power supply in the KC 140 will maintain regulation with input voltages on the
aircraft power bus as low as 11V ; voltages over 33V are clamped internally. The KC 140 draws
0.2A nominally during operation with peak current draws of 1.0 A. The aircraft power return line
has 1.8A nominally flowing through it and 4.0A peak. The voltage on the aircraft power bus can
be viewed on the ANALOG VOLTAGE INPUTS diagnostic page (as A/C MON).
DIAGNOSTIC NAME
SCALE FACTOR
A/C MON 1V/V
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