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 TM 55-1905-219-14-11
5-115. HEADING SELECTOR - MAINTENANCE INSTRUCTIONS
The Heading Selector is used as an interface between a gyrocompass and steering control panel to select the desired
heading of the vessel. The gyrocompass transmits actual heading data to the Heading Selector for comparing the actual
heading data with the ordered heading data. If the actual heading and the ordered heading are the same, there is no
signal output from the Heading Selector. If the actual heading and the ordered heading differ, the Heading Selector will
produce a signal that will cause the rudder positioning equipment to change the vessel's actual heading to its ordered
heading.
Three-wire synchro data from the gyrocompass provides the heading information, and the same 115-volt, 400-hertz
supply that powers the gyrocompass is needed for reference and illumination requirements.
The gyrocompass card is connected to a synchro which is excited by a 115-volt, 400-hertz supply. Three-wire heading
data is transmitted by this synchro to synchro B1 of the Heading Selector. The heading selector card is connected to
synchro B1 rotor so that for any reading of the gyrocompass card, the voltage induced in synchro B1 rotor will be zero
when the heading selector card is set to the same heading. When the heading selector card and the gyrocompass card
are on different headings, an error voltage is induced in synchro B2 rotor.
5-1287
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