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ANNUNCIATOR
DIM/TEST UNIT
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Solid State, Two Channel, FAA and TSO approved. |
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Reference
the Manuals
page
for installation and information manuals. |
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The
Annunciator Dim/Test Unit (ADU) simplifies the engineering task of installing
aircraft system annunciators. It provides a dedicated source of
adjustable dimming, power, and testing for both pilot and copilot annunciators
in one compact unit.
The ADU houses two separate P.C. boards that are identical but independent from each other, including separate annunciator power sources. Each P.C. board contains 25 diode isolated annunciator trigger / test lines, for +28vdc logic (normally set to +14VDC), and one adjustable dimming circuit for ground logic. These adjustable circuits eliminate a common problem encountered in major avionics installation, namely matching the intensity of all the annunciators during a night light condition. The Bright / Dim and Test mode functions are designed to ease installation and are triggered by either +28VDC or ground logic. OPERATIONAnnunciator power is supplied from the a +28VDC circuit breaker through a normally closed relay contact. Selecting Dim mode routes annunciator power through a variable power circuit capable of supplying +28vdc to +10VDC (factory set to +14VDC). Power from this circuit then travels to seven diode isolated power outputs. Total current draw from this circuit should not exceed 1.5 Amps at +28VDC. Each
board contains an adjustable ground potential circuit for dimming
28 VDC annunciators. During normal operation (bright light) a ground
is supplied through a normally closed relay contact. Selection
of Dim mode routes ground potential through a variable regulator circuit,
adjustable from +0.0VDC to +18VDC (also factory set to +14VDC). Total
current draw on this circuit is limited to 0.5 amps at +28VDC. Each
board also contains 25 diode isolated input/output lines that are
either grounded or supplied +28VDC during annunciator test mode. Configuration
of these test lines is dependent upon the dash number of the unit.
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Typical ADU installation:
Above
wiring diagram is for reference only. Reference the Manuals
page
for installation and information manuals.
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GENERAL
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