Checking Generator Output (Constant Voltage); Temperature Test - Fiat 411 R Service Manual

Chegking generator output (constant voifagel
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Fig. 130. - Output curve of generator type R115-$40_!24-
$603 Var. 2, when warm.
{Cut-in speed at 24 'v'.: 12OD»'lé(}0 F?.F.M.).
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Fig. 13?. - Wiring diagram for the output curve pioiting
{ampére versus R.P.M.) at 2 constant voitage of 24 V.
Ni. Generator actuating motor - G. Generator - V. Voitmeter,
30 V "lop reading ~ A. Ammeter, 20 A top reading.
Temperature test.
84
The output curve shown in Fig. ?3B has been obzfained
with generator heated after a period of operaiion.
Therefore, before plotting the characteristics, mouni
the generaior on five tesf bench, according to diagram
of Fig. 13%; rim it through a moior for about 30 rml
nuies, at 20-00 R.P.M.
The current output (5-5,5 A az' 28 V) shouid be Sup-
piied by a rheosiai,
Siop generator, and disconnect ioao'-rheostai. Fioéaie
generator, graduai/y increasing ifs speed uniii ihe
voiimefer reads 24 V, Eben measure the generator
speed.
Such e speed represenfs the cui-in speed {hot con-
ditions) and shouid lie between 1230 and 1360 R.P.i'vi.
(points on abscissa ~ diagram of Fig. 139).
Sfop fhe generator, inseri the /cad-rheosiaf, and
meiniaining constant fise voltage, check againsi the
various speeds fine current values included in the
cross-haicheo' area of diagram in Fig. 138.
Diagram piofiing should be made rapidly when
generator performance is beyond iés rated output
and therefore overioaci mighi damage ii.
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Fig. 'I32. - Diagram of connections to check genaraior
heaiing.
M. Generator actuating motor - G. Generator - V. Voitmeier,
30 V top reading - A. Amrneter, 10 A top reading.
(The reguiator group to be coupled to the generator should
be of the A;'3-140f24 type).
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if in doubt es lo the maximum temperature of the
generator during operation mount if on the iesi
bench, with pulley and regulator group, according
to diagram of Fig, 132.
Run generator coring 45 minutes at 2000 R.P.M. and
during Y5 minutes at 4000 R.P.ii/i. supplying to a
resisior a current of 4,95 to 5,55 A at 28 V.
Overheafing measured by pyromeafer, should be:
— on generator frame: 45° C (113° F), or less;
W on commuiafor: 90°C $794" F}, or less,