General Interconnect Information; Power Inputs; Air/Ground Discrete Input - Honeywell BENDIX KING KMH 880 System Installation Manual

B B
B B
3.1

GENERAL INTERCONNECT INFORMATION

3.1.1

Power Inputs

The Processor is powered with +28 VDC and is protected by a circuit breaker
(5 Ampere) in the Aircraft distribution center.
A. 28 Volts Direct Current
J10 - 59 & 82 →
Power:
B. DC Return
J10 - 127 & 128
These pins connect to airframe ground with 22 gauge wire minimum.
The KMH 820/KTA 810 will shut down when the power line dips below +15
VDC. The KMH 820/KTA 810 will resume normal operation (i.e. surveilling
targets) on power restoration (when the power line meets +18 VDC mini-
mum).
3.1.2

Air/Ground Discrete Input

The Air/Ground Discrete, if used, is wired to a logic source in the aircraft that
presents a standard "open" circuit while the aircraft is airborne and a standard
"ground" when the aircraft is on the ground. The Air/Ground Discrete is filtered
to allow takeoff and landings. The discrete will remain in the same state for 10
seconds before changing states.
AIRBORNE = >100Kohms , or +18.5 to +36 VDC.
ON GROUND = < 10 ohms, or 0 to +3.5 VDC.
J10-4 Air_Gnd*
Rev 0, October/2000
Nominal:
Range: + 22 Vdc to + 30 Vdc.
46 ± 2.3 Watts
NOTE
10609I00.ZIPCDL
+ 28 Vdc A/C Power In.
1.3 ± 0.2 Amps @ 28 VDC typical current
1.65 ± 0.2 Amps @28 VDC Max operating
3.3 Amps @ 18 VDC maximum current
KMH 880/KTA 870
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