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210
FIAT - 850 PASSENGER CARS
Therefore. when handling the unit to replace reg-
ulating resistor
I
the arrangement of relays may be
altered.
For this reason, make sure
that,
after
tightening the nuts, no asymmetry,
if
any, is left.
In any case, the operation should be perfonned
with
maximum care and regulating resistor mount-
ing nuts should be tightened securely.
If,
after adjustment, armature-ta-core air gaps are
not
within
specified tolerance,
it will
be necessary
to bend blade spring (8, fig. 335) carrying the sta-
tionary contact so as to bring air gap again within
recommended limits.
During this operation, it is
essential to maintain the parallelism of both the
movable and stationary contacts, that is to say, the
two contacts should touch each other at their centers.
This condition should be checked using a magnifying
glass.
NOTE
&
Even if cutout is not disturbed by removal
of regulating resistor, it is always advisable to
inspect cutout just the same, checking that:
- armature-to-core air gap, with contacts closed,
measured at core edge towards contacts (fig.
335)
is .0138" (0.35 rom);
-
point gap, with open contacts, is .0153" to
.0201" (0.39 to 0.51 rom).
Fig. 337.
Wiring diagram for setting the cutout relay.
(Generator regulator 2/12/16).
B\' 2-V battery. - B
t
.20-V battery. - A. Ammeter, 20 A
scale (1% accuracy).• V. Voltmeter, 20 V scale (0.5%
accuracy), directly connected to terminals 31 - 51. -
P.
Potentiometer for voltage adjustment, having such
a capacity that the current draw of the cutout shunt
winding does not cause sensible variations in the
voltage readings (voltmeter under no load). - S. Test
lamp, with
2 V, 3 W bulb, to signal opening and dos-
ing of contacts.• R. Rheostat,
4 0,
12 A. - R , • Voltage
drop rheostat, suitable to allow turning on of
5,
with
T.
open and cutout contacts open.
Selting of instruments before inserting the unit:
- P.
At minimum (voltmeter reads zero).
-
T. Open.
-
R.
All in (max. resistance).
-
T
I •
Open.
,.J
T
p
s
67
51
R
R ,
B,
~------------------,
:
-
·~E~~'
I
~~~
:
:
'31
,
, ,
,
,
,
'---------
ADJUSTMENTS
The adjustment of generator regulator must be
carried out by placing the assembly without cover
upright on bench with terminals lowermost.
WARNING - If the regulator assembly has remain-
ed for a certain while in a room below 590 F
(15
0
C)
or above 95° F (350
e),
before proceeding as out-
lined hereafter, keep the regulator for at least one
hour at 590 to 950 F (150 to 35° C) room temperature.
Adjusting Cutout Relay.
Wire as shown in diagram of fig. 337.
The setting of instruments before inserting the
unit should be:
P
at minimum (voltmeter reads zero);
T open;
R
all
in (max. resistance);
T
1
open.
Contact closing voltage (room temperature: 590 to
950
F -
150 to 350 C).
a) Close switch T,
b) Stabilize regulator temperature with cover
on, by feeding current for 15 to 18 minutes at
16.5 V (obtained by suitably adjusting P) for initial
regulator operating temperatures of 590 to 680 F
(150 to 20
0
C), or at 15 V for initial operating tem-
peratures of 680 to 950 F (200 to 350 C).
c) Immediately after stabilizing the regulator,
bring voltage to 12.4 to 12.8 V by adjusting P.
d) Remove cover and adjust load on setting
spring by bending the relevant ann, until pilot
lamp S goes out.
e) Reset P to minimum value.
f) Again increase voltage by working on P and
check that pilot lamp goes out at the specified
voltage.
Reverse current (room temperature: 590 to 950 F -
15' to 35' C).
This test must be run soon after the closing
volt-
age test, so
as
to maintain regulator temperature
stabilization.
a)
With switch T closed, by working on P
bring voltage to 14.5 V.
Cutout contacts should
pe closed, pilot lamp
S
off.
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