Honeywell KA 54 - Manual (Page 28)

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KRA 405B RADAR ALTIMETER INSTALLATION MANUAL
Page 2-2
006-10536-0010 Rev. 10 Oct/2005
The installing agency will supply and fabricate all external cables. The
connectors required for RG 393 (the preferred cable) are supplied by
Honeywell. Installation kits are also available. Consult 1.4 UNITS AND
ACCESSORIES SUPPLIED (KRA 405B SYSTEM COMPONENTS) as required.
The greatest single contributor to increased reliability of all modern day
avionics is to limit the maximum operating temperature of the individual
units whether panel mounted or remote mounted. While modern day
individual circuit designs consume much less electrical energy, watts per
cubic inch dissipated within the avionics unit remains much the same due
to the high density packaging techniques utilized. Consequently, the
importance of providing cooling to the avionics stack is still with us
today.
While each individual unit may or may not require forced air cooling, the
combined heat load of several units operating in a typical avionics
location will significantly degrade the reliability of the avionics if
provisions for cooling are not incorporated in the initial installation.
Failure to provide cooling to the equipment will lead to increased
avionics maintenance costs and may also void the Honeywell warranty.
2.4 CONFIGURABLE PARAMETERS
The installer may alter some of the operational characteristics of the KRA
405B by installing a CM 2000 Configuration Module that has been programmed
with customized preferences. These characteristics are the threshold
altitudes for the three Altitude Trip Points and a selectable offset to
be applied to all altitude outputs. If these parameters are
inconsequential to the installation or the factory presets are acceptable,
the CM 2000 should not be installed.
A. ALTITUDE TRIP POINTS
The KRA 405B provides three discrete outputs called Altitude Trip
Point #1, Altitude Trip Point #2, and Altitude Trip Point.#3. The
KRA 405B asserts the discrete when operating at an altitude below
the configured trip point. The factory settings are: Altitude Trip
Point #1 at 200 feet, Altitude Trip Point #2 at 500 feet, and
Altitude Trip Point #3 at 1200 feet. If any other altitude is
desired, a programmed configuration module must be installed with
the KRA 405B.
Refer to the KPA 900 Operators Guide P/N 006-05392-OOXX for
instructions to set up the programmer, invoke the program, and
select the KRA 405B database. Select the Memory then the View
options to display the default configuration. A screen similar to
the following figure should be displayed.