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ELECTRICAL
207
R
31
7
0
GR
31
Fig. 331 - Wiring diagram for checking the current and voltage
regulators.
GR. Regulator GN
2/12/16.•
G. Generator FIAT
0
9O{12{16{3 CS.•
V. Voltmeter, 20 V scale (0.5% accuracy). - A. Ammeter, 20 A scale.·
R. Rheostat, 2S A· 3
0. .•
B. Battery, 50 Ah, fully charged.
yr----t=t=L=
gzv
.,.
Fig. 329 - Wiring diagram for checking the cutout closing
voltage.
GR. Regulator GN 2/12/16. - G. Generator FIAT 0
9Oj12/16/3
CS .•
V. Voltmeter, 20 V scale (0.5% accuracy) .• L Bulb (12 V, 3 to 5 W).
B
Fig. 332 • Wifing diagram of regulator assembly GN
2/'2f16.
_._._-_.
"".
,
I
I
I
I
I
/
30
I
Regulated current on battery.
Wire
in
accordance with the same diagram as
for voltage regulator.
The regulated current on battery must be check-
ed immediately after testing the haH-Ioad regu-
lated voltage (on battery) of the voltage regulator.
Instruments are the same as used in determining
haH-Ioad regulated voltage, excepting the ammeter
which must have a 25 Amp scale.
Insert maximum rheostat resistance.
Operate the regulator at 117
0
to 127
0
F (47
0
to
530 C) for 30 minutes with regulator-controlled
current (reduce resistor R of rheostat until current
is steady and voltage drops) and 13 Volt tension.
After this operating period, check current for a
steady delivery (that is rated operation temperature).
Stop the generator, restart and speed it up to
4,500 r.p.m.
Check that the regulated current rate
corresponds to specified 15 to 17 Amperes.
By still reducing the resistance, the current
shall remain constant.
The voltage, instead, with
the decrease in resistance should drop to as low
as 12 V.
Checking Current Regulator.
CURRENT REGULATOR
VOLTAGE REGULATOR
CUTOUT RELAY
l.:5c:..
'
----=,51 6,c]
=-_
6]
/ . - . -
,.
I
I
I
I
I
.,
Fig. 330 - Wiring diagram for checking the reverse current
of cutout.
GR. Regulator GN 2f12/16. - G. Generator FIAT
090/12/16/3
es..
B. Battery, 50 Ah, fully charged.• A. Ammeter, asymmetrical scale
1()"o'15
A •• V. Voltmeter, 20 V scale
(0.5
%
accuracy).
L - -
y
_
'-t_~:t=A==:;~
NOTE - To obtain the max. reverse current
pos~
sible, the reduction in generator speed must be so
quick as not to give battery voltage sufficient time
to drop excessively (10 seconds). Should it be de·
sired to repeat the test, to avoid erroneous readings
which may result from residual magnetism in cut-
out, wait until generator stops and then re-start.
Checking Voltage Regulator.
This limit indicates max. reverse current value
which must not exceed 16 Amp.
Regulating voltage, with "[half load, on battery
(room temperature: 1170 to 127
0
F - 47° to 53° C).
Wire as shown in diagram (fig. 331).
Operate
regulator
in
room
temperature
of
1170 to t270 F (470 10 53° C) for 30 minutes, by
supplying a current haH that of regulated current,
namely 7.5 to 8.5 Amps.
For this test, the thermostat oven Ap. 5014 should
be available, so that regulator can be maintained
at the above specified temperature.
Soon after this test, keeping regulator always at
117
0
to 127
0
F (47
0
to 53
0
C), stop generator and
start it again, increasing its speed gradually up to
4,500 r.p.m.
Adjust rheostat R for a generator -output corre-
sponding to haH-load current, that is 7.5 to 8.5 Amps.
With this generator output, voltage should be
13.9 to 14.5 V.
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