Quantcast Figure 4-17.--Mk 23 Mod C-3 control cabinet.
 

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Figure 4-17.--Mk 23 Mod C-3 control cabinet.
converter or a 24-volt dc supply and to the master
reversed to counterclockwise as viewed from the
unit.
south end of the gyro axle as it was in other ballistic
compasses. The direction of the vertical torque is also
reversed.
POWER CONVERTER
The Mk 27 gyrocompass system (fig. 4-18) consists
The power converter is used to convert 115-volt,
of a master unit, an electronic control cabinet, and a
60- or 400-Hz, single-phase power to 24-volt dc when
power converter.
24-volt dc is not available.
MASTER UNIT
OPERATING THE MK 27 GYROCOMPASS
The master unit contains the compass element
The control panel located on the electronic control
and receives its electrical and electronic support from
cabinet contains all the operating controls necessary
the electronic control cabinet. The master unit also
for operating the compass. Instructions for starting
contains a bellows assembly to allow for temperature
and securing the compass are listed on an instruction
variation, a card viewing window, a cager diaphragm,
plate located near the electronic control cabinet. For
an electrical connector, and the fluid-filling nozzles.
additional information on starting and stopping the
compass, refer to the manufacturer's technical
ELECTRONIC CONTROL CABINET
manual.
The electronic control cabinet houses the control
WATCH STANDING
panel,  power  supply,  servoamplifier,  latitude
compensation  circuit,  and  alarm  circuit.  The
Watch-standing  procedures  for  the  Mk  27
electronic control unit has plug-in connectors, which
gyrocompass are basically the same as for the Mk 23
are used to connect the unit to either a power
gyrocompass. Indicator lamps for the power available

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