Control Box Setting; Bottom View Of The Control Box Gp 1/24/7 - Fiat 411 R Service Manual

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Th esistance value is 73 to 77 ohms at 29°C (sew F), ii {he cut-out contact closing Vglfage 53 fmmd R,
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be low or the conlacis remain open even at high generator speed, check the resistance (11, Fig. 139) to
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ascertain whether the cause musi be attributed lo altered value or to an interruption of the wire.
Fig. 159. - Botfiom view of ihe comb-oi box GP 1124,17.
B.- Regulation resistance » 7. Additional resisiance connected
to the vollage regulator winding - 18. Damping resistance
shunted across the generaior between current regufator and
ground - 11. Addiiional resistance for current regulator and
out-out relay shunt windi:-|gs~ 38. Electrical equipment terminal
- 51. Terminal connected to the positive pole of the generator ~
67. Terminal connected to the generator field winding.
of a coii short the value of the resistance decreases while the current regulaéor and out-om in case ,
relay shunt winding absorbs more (as the resistance is connected in series to these windings and closes
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the circuit to ground) that is, it creates a greater pull on the armatures, partacuiary on t e cu -ou one,
where the magnetic effect is greater and therefore the contacts close at a lower voitage.
"houid the resistance wire be interrupted, the cutout and current regulator shunt windings have no
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current flowing through them as the circuit is not closed across the generator casing, therefore the
tout contacts remain open, which is signaled on the dashboard by the battery charge warning lamp cu ~
which remains lighted. Resistance trouble has no effect on the current regulator.
The resistance value is 73 to T7 ohms at 20° C (E8° F). Replacing one resistance calls for repiacemeni
of the other one, too. To replace them proceed as for resistances 6 and 10.
Conirol box seiting.
The setting of the control box on the test bench should be performed without the cover, placing the box
verticaliy w§th_ihe terminals facing downwards.
Cautions: if the control box has remained for a certain iength of time at ambient temperature below
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15° C (590 F} or above 85° C (95° F), place it for about one hour at a temperature of25°I10° C 07°: :10 F).
Wire the control box according to the diagram of
Fig, 160 and p/ace the insfrumenis as follows:
- potentiometer P at minimum (1/oiifmefer at zero);
— switch T open;
-.~ rheosiai R all on (max. resisiance);
~ swiich T1 open.
7) Contact poinis closing voltage (at a femperature
of 25°i 70° C 2 77°7';5O°!-'j.
Close switch T. Stabiffze the temperature of fhe
unit, equipped with its own cover, by feeding it
ior about 75 '£0 18 minutes at a voltage of 2 30 l/.
through potentiometer P;
Cui~ou?t reiay setting.
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