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break and necessitate disassembly of the machinery to
Electrical Connections
remove broken glass and mercury.
Inspect all electrical connections (particularly
Any unusual noise in operating machinery may
terminals and terminal board connections) at frequent
also indicate bearing malfunction. When a strange
intervals to ensure they are tight. Loose connections
noise is heard in the vicinity of operating machinery,
result in increased contact resistance and increased
make a thorough inspection to determine its cause.
heating, which may result in breakdown. Use
Excessive vibration will occur in operating machinery
locknuts, lock washers, or other means to lock
with faulty bearings, and inspections should be made
connections that tend to become loose because of
at frequent intervals to detect the problem as soon as
vibration. Inspect soldered terminal lugs for looseness
or loss of solder, and tighten solderless terminal lugs
occasionally. When electrical connections are opened,
Loose Metal and Solder
clean all oil and dirt from contact surfaces before
reconnecting. If the contact surfaces are uncoated
Keep all small pieces of iron, bolts, and tools away
copper, sandpaper and clean immediately before
from the machines. Where it is necessary to do any
joining. If the contact surfaces are silver-plated, do not
soldering, make sure that no drops of solder get into
use sandpaper. Use silver polish or a cloth moistened
the windings and that there is no excess of solder on
slightly with an approved cleaning agent. Coat the
soldered joints, which may later break off due to
finished joint with insulation varnish. Steel bolts for
vibration and fall into the windings.
making electrical connections should be zinc plated.
Make sure that exposed electrical connections are
Bolts and Mechanical Fastenings
adequately insulated to protect against water and
moisture and injury to personnel. This applies
Care should be exercised not to disturb the
commutator clamping bolts on dc machines. Inter-
especially to exposed connections at terminal straps
ference with these may make it necessary to turn or
extending outside the frames of propulsion motors
grind the commutator to restore it to service. Other
and generators, Motor connection box leads should
bolts and mechanical fastenings on both the stationary
b e assembled as shown in figure 1B10 of
and rotating members should be tightened securely
DOD-STD-2003-1 (Navy).
when the machine is erected, checked after the
equipment has run for a short time, and thereafter
Filter Cleaning and Equipment Inspection
checked at regular intervals to make sure that they are
tight. Particular attention should be given to the bolts
Clean or replace permanent-type air filters
used to clamp any insulation.
quarterly. Machine temperatures should not be
allowed to rise above the design rating, and filters
Rotor Hardware
should be changed as often as necessary to prevent the
entrance of oil, water, metal shavings, abrasives from
If an inspection of a rotor shows that there is a
grinding, and dirt. Upon completion of overhaul and
looseness of keys, bolts, or other fastenings, check for
prior to operation without filters, ensure that all dirt,
evidence of damage due to this looseness. Such
abrasives, chips, and so forth, are removed from
looseness may result in worn dovetail keys, damaged
pockets in the foundations in the vicinity of the
windings, or broken dovetails on the end plates. Two
foundations of electrical rotating machinery. After a
or three drivings usually will ensure the tightness of
machine has been cleaned, inspect the windings for
the keys, but nevertheless they should be checked
visual evidence of mechanical damage to the
insulation or damage caused by excessive action of
any solvents used in cleaning.
Armature Banding
Information on the repair and revarnishing of
damaged insulation can be found in NSTM, chapter
Check the banding wire on dc armatures at regular
intervals to make sure that it is tight.

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