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RELEASED FOR THE EXCLUSIVE USE BY: AIRCRAFT ELECTRONICS ASSOCIATION
BENDIX/KING
2.9
AVAILABILITY OF 400 HZ POWER FROM THE KG 102/KG 102A
This section contains information pertaining to 400 Hz. power requirements and the use of the KG
102/102A as a source. Refer to figure 2-28 for additional information.
If a KI 229, KGR 356, GC 381, or KNI 582 is installed with a KCS 55A Compass System, 26 V,
400 Hz. power is needed to excite the heading bootstrap in the KI 525/525A and the compass H
and C inputs of the KI 229, KGR 356, GC 381, or KNI 582. In some cases, the KG 102/102A can
supply the necessary 400 Hz. power and eliminate the requirement for a external inverter. If the
following conditions are met, the KG 102/102A can supply adequate 26 V, 400 Hz. power
1.
Except as noted below and in figure 2-28, the excitation of the KI 525/525A heading
bootstrap rotor H and C will be the only load on the KG 102/102A 26 VAC output
(P1021, pins p and t).
2.
The compass heading X, Y, and Z inputs of the KI 229, KGR 356, GC 381, or KNI
582 will be the only load on the heading bootstrap output.
3.
No additional loads, such as the course datum synchro in a NAV 2 indicator (for
NAV1/NAV2 autopilot transfer), will be connected to the KG 102/102A 26 VAC out-
put (P1021, pins p and t).
4.
Some Honeywell Flight Control Systems incorporate a KRG 331 Rate Gyro. These
units are typically shown powered off of the KG 102A. The KG 102A will not simul-
taneously supply a KRG 331 and a KI 229 or KNI 582.
In addition, radar graphics requiring 400 Hz. power, such as the GC 381A or KRG 356, may be
installed utilizing the output of the KG 102/102A. Since these units only require .01 MVA of power,
they may be installed in addition to a KI 229 or KNI 582 without requiring an external inverter. Also,
the KG 102A will supply enough power for a KRG 331 and KRG 356 or GC 381A.
The KG 102/102A has a 5 VA maximum of 26 V, 400
Hz power available for all uses. If more than 5 VA is
required, an external 400 Hz. inverter will be neces-
sary.
If the 5 VA maximum is exceeded, severe damage
will result to the power supply causing catastrophic
failure of the compass system.
Two (2) 400 Hz. outputs cannot be paralleled. An in-
verter, when required, must be large enough to han-
dle the total AC load.
Rev 11, Apr/2007
©Honeywell International Inc. Do not print without express permission of Honeywell
NOTE:
CAUTION:
CAUTION:
KCS 55/55A
Page 2-9
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