Front View Of The Control Box - Fiat 411 R Service Manual

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porary overload oi the generator not only does not damage the windings but is good for the battery
particularly when the charge is lOW, Whifili may happen after diiticuit or repeated coid starting or after
the kind of work which requires repeated startings for short hauls;
f - the regulated current is dependent upon the
temperature of the surroundings and will be
higher or lower depending upon a low (Winter)
or high (Summer) temperature, which for the
generator means more uniformity of tempe-
rature through the seasons.
The curve of a hot control box is piotted in Fig. 153
and as one can notice it starts with an almost
horizontal line which shows that the current is
maintained constant up to a certain voltage, then
drops quickly.
The junction area between the two strips shows
the operating iimit between the voltage and cur-
rent reguiators.
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Fig. $52. - Front view of the control box.
1. Current regulator armature hinge - 4. Fixed contact support
tip - 5. Adiusting spring support lip - 51~5T-30. Terminals.
This regulation system takes tuli advantage of the generator output and maintains the battery at a good
level of -charging even after difficult or often repeated starts. Should the battery be discharged, it will
be recharged with the maximum output current up to a high charge (28 V) and when the latter is exceeded
(29,5 V} the voltage regulator intervenes to reduce the generator charge (all electrical equipment oft).
When the battery is charged, the delivery current is reduced to a few amperes to prevent excessive
electrolysis, overheating, insulator damage.
IMPORTANT
1. — The control box mod. GP'i,"'24,-'7 must only operate together with the generator rnocl. DC1t5,"24;'?;'3;
this iimitatienis necessary tor two reasons:
a} only the generators specified above can be overioaded at cold starting;
b) the controi box has been designed to suit
these generators and the field windings have
been designed to suit the control box. Should
the latter be connected to a different genera-
tor, the operation wouid be incorrect, the
settings would change, the useful life of the
contacts would be pratically shortened and
the generator would soon be put out of use.
2. ~ An incorrect connection of the control box
terminal No. 67 with the generator terminal No. 51
produces immediately a strong sparking effect
which oxidizes the contacts of the elements of
the controi unit, it orotracted longer it caneaslly
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Fig. 153. - Regulation characteristics {volt~a.-npere) of
the control box model GP 1/24/'F on the battery {curve
plotted with data obtained at an ambient temperature of
505:1»; 39 C w 122°;§< 37° F and generator speed of 3506 r._o.rn.).
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