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 TM 55-1905-219-14-5
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 Am 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.
3-1122
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