36 MB pdf download - VIR History

2 Section
Porogroph I i (3)
NAVSHTPS 9rO47
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Figure 2-15. Terminol Boord Wired Using Modified TTRS Coble qnd Thomqs ond Belts Grounding Ferrules
#200-30006
ground buss on the terminal board (see figure 2-L6).
Be sure that the loop is made big enough to allow the
terminal board to be pulled through the front for
servicing with the wires connected. Whenever polarity
must be maintained, ring out the circuits and clip
the ltrg on the conductor which connects to the same
terminal as the clipped lrrg in the internal cabinet
wiring.
i. PRIN'IARY POWER CONNECTIONS ( f isure
2-17 ).-The primary power input cable to the cabinets
connects into Switch Panel AN Typ" SA-134 /C
through a knockout in the bottom for L/2 or 3/4 inch
conduit (conduit not furnished). The normal primary
power input is 115 volts AC, 60 cycles. Fuses
required are 15 ampere for convenience and strip outlet
and one ampere capacity for the trouble light circuit.
Supplv of 230 r' 60 cycles may be used if equipment
served within Cabinets is so rated and if 5 amp
fuses are used.
It. INSTALLATION TESTS.
(t) CONTINUITY TESTS.-When the cabinet
wiring is completed and all interconnections made,
each unit should be given a final check before being
put in service. This is to insure that the components
have been correctly installed and that all wiring connections
are complete. A continuity check should be
made on each unit with the volt-ohm-milliammeter or
a portable device for ringing or lighting out circuits.
To check continuitv through a particular wire, refer
to the applicable connection diagram figures 2-37
throtrgh 2-4L and proceed as follows:
( u) Select some starting point on the diagram,
preferably an input.
(b) Mark this point on the diagram and locate
the corresponding point in the equipment.
( c ) Trace the circuit from this point to the next
point where contact can be made such as a terminal
board, switch terminal, etc., and test the continuity.
2-15
RESTRICTED
Mark the test.points and check wires on the diagrarn
to insure that all wires aie checked thoroughly.
( d) Proceed in this manner, marking each
point until all wires are completely checked as indicated
between test points on the diagram.
(e) Draw up a corrected connection diagram
for the particular installation showing actual circuit
markings as installed for use of maintenance men to
permit rapid diagnosis of trouble in the future.
(2) INSULATION TESTS.-After continuity has
been established in all circuits, test insulation resistance
with test equipment provided by BuShips as
part of the system. The resistance of the RF cables to
ground must be approximately 50 megohms or more.
In the AF section, the resistance between conductors
and between the conductors and ground must be at
least five megohms. Replace or repair defective components
as necess ary. Record all values in a suitable
manner and turn them over to the officer-in-charge for
subsequent use by maintenance personnel.
l. AF JUMPER CABLES.-Connections between
the Interconnecting Terminal Boards of the AF section
(see figures 2-22 and 2-23) are made by flexible jrr-pers
fitted with spade lugs so that the connections may
be readily altered to minimize use of patchcords on
front panels. The installing activity should {abrica .e
enough of these jumpers to connect all circuits in the
equipment. The jumpers are made of suitablt, {w irited
pairs fitted with Thomas and Betts Grounding 'rr'errules
#200-30006 and spade lugs on each end installer'
in the manner shown in figure 2-I5. The jumper
should be made long enough to reach between, thc;
most remote terminals of the Interconnectin J 'Ie:r -
minal Boards. Clip the spade lugs on both ends o't:
one of the conductors in each jumper to mr.'.,e it "rutsible
to maintain polarity.
m. MARKINC.-Designation strip;, and i'ard hokiers
are provided on the panels for int:':'r'tion li circuit
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