Fiat 411 R Service Manual page 51

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Fig. 155. - Electrical diagram of the arrangement for
testing the out-out reiay return current.
M. ?es': bench electric motor - G. Generator DC €15,i24;'7;'3
and its modified versions — A. Amrne1er- V. Votimefier, 30 V
top reading.
Voltage reguiator check.
Current reguiator check.
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Fig. 158. - Electrical diagram of the arrangement for
fasting 'the voltage and current regulators.
M. Test bench eiectric motor - G. Generator DC 115,"24/7'13
and its modified versions - V. Voltrnefer, 30 V top reading -
A. Ammetar. 10 A top reading.
Hook up according to the wiring diagram of Fig. 157
and run the generator up to 3500 l?.P.M. ho/cling
it at this speed for 5 minutes.
See that the voltmeter reads at least 29 V, than
gradually decrease the generator speed. The ampem-
meter indicator which had shown at first a certain
amount of charging current, will graduaily go to
zero, then will show the reverse current on the
opposite scale. As the generator speed gradually
decreases, the reverse current will increase up to ,3
given limit at which it will drop to zero (cut-out
contacts open). Said limit represents the maximum
reverse current value which should be 6 to 14 A,
Note. ~ To repeat the test, if necessary, begin
from a stopped generator to avoid incorrect readings
due to residual magnetism in the magnetic material
of the cut-om'.
Regulation voltage on half-charged battery (ambient
temperature of 50° i 3° C or i22'° i 37.40 F).
Connect the group according to the a'ia_qram of
Fig. 156 and operate it at 50°;!;3°C temperature
for about 30 minutes, with e half-charge current
output corresponoing to 5 A.
immediately afterwards. maintaining the box at an
ambient temperature of50° i 3° C stop the generator
and run it again at a gradually increasing speed up
to 3500 rpm; adjust the rheostat so to set the ge-
nerator half-charging with e current of 5A at 28,7
to 29,7 V.
Regulation current on battery: this check must im-
mediately fol/ow the preceding one.
Connect the unit according to the diagram of Fig. '£56
and connect the rheostat maximum resistance;
operate the unit at 50°i 3° C ambient temperature
for 30 minutes, at regulation current speed (to this
end decrease the resistance of rheosiat until the
current remains about constant and the voltage
drops) and at the specified 28 V. At the enci check
that the output current has become stable (i. e.,
thermal stability has been reached); stop the generator
and connect the rheostat maximum resistance, start
it again and run it up to 3500 F?.P,M.;
decrease the resistance graclually until the voltmeter
indicates 28 V and the ammefer a regulation current
of 6.6 to 7AA.
As the resistance continues to decrease the current
should slowly rise, and the voltage drop sharply
almost to 24 V.
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