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 TM 55-1905-220-14-5
3-62.2. VOLTAGE REGULATOR-MAINTENANCE INSTRUCTIONS (Cont).
generator voltage are reduced. The lowering of the output of the generator causes the points to close
again, thereby removing the resistance and increasing the generator output. The complete cycle of
opening and closing the points and the alternate inserting and removing of the resistance in the generator
field circuit is done rapidly, thus limiting the generator voltage to a predetermined maximum value. With
the generator voltage limited, the generator supplies varying amounts of current to meet the requirements
of varying electrical loads.
d. Current Regulator.
(1) The current regulator contains two windings assembled on one core: a series winding and a field
current winding. The series winding, consisting of a few turns of heavy wire, is connected into the charging
circuit so that the full output of the generator passes through it. The field current winding is connected in
series with the generator field circuit so that the field current flows through the field winding when the
regulator contact points are closed.
(2) The outward appearance of the current regulator is similar to that of the voltage regulator.
(3) Operation.
(a) The magnetism produced by current flowing through the series winding overcomes the
armature spring tension, and the contact points open when the current reaches the value for which the
current regulator is adjusted. This inserts a resistance into the generator field circuit, resulting in a drop
in generator output. Immediately, the magnetic field of the series winding is weakened, the contact
points close, the generator output starts to increase and the cycle is repeated. This action prevents the
generator from exceeding its rated output.
(b) Therefore, when the load demand is heavy, generator output will increase until it reaches the
current value for which the current regulator is set; then the current regulator will begin to operate and
pre-regulate the current output from the generator.
(c) After any check or adjustment of the voltage regulator, it is necessary to polarize the generator
before starting the engine to assure correct polarity.
3-1104
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