Electrical Diagram Of The Central Unit Gp1/24/7 - Fiat 411 R Service Manual

,.
wt.» 1 *3
§. _ _. ,
Ll
_ 4 a e \ L 1 * > * \ ' — ' fl u i d - L t - ; : _ - _ — _ . - . . - : = : - ¢ u u » i ~ e . * - € . * » : m . -
-W
3
¢ . _ » - _ ' _ - = : _ -
- L l
_ ; ' - ' J > . ~ @ 1 - ' 5 - A - J - _ . . _ i ' - ' J
ii
{ii
. 1 1
=1
.i
' 1
?i
- 1
J _ = . c _ . . _ u _ ; 1 t : , . , . . t . ' . u - 4 - 2 .
. . . _ . . . _ _ . . - » . . . _ . . . _ _ _ . _ _ . . , . » . . . . . . . _ ; , . _ _ , , , _ , _ _ _ . . _ " . _ , , _ , _ . -.- - _ , _ ; , ; ; _ ; I. .- = . , _ ~ M
if
i
As the generator speed increases the voltage and the currentoutputincrease creating a stronger magnetic
flux, when the generator reaches predetermined values oi speed and voltage the magnetic flux becomes
sufficiently strong to win the resistance of the tension springs and so attract the armature to the cut-
out core to close the contacts. A current is then circulated from the generator positive terminal through
the series windings of the units (Fig. 151) to the electric system equipped and positive terminai of the
battery and returning to the negative brush of the generator.
The magnetic flux induced in the series windings is added to the one induced in the shunted windings
to hold the cut-out contacts more securely closed. As a rule, otter the cut-out is closed and the ge-
nerator voltage keeps on raising, the contacts of the voltage reach the predetermined setting value. As
the contacts open due to the magnetic flux induced by the shunt winding and acting on the armature, an
acceleration winding (a) and the regulation resistance (6) are inserted in the tield winding circuit of the
generator. The regulation resistance lowers the current through the generator iieici winding and conse-
quently the generator voltage until the voltage regulator contacts close again.
,_ __., .. Tin ' 7'
7, 11 -
---~~-u*=nnlur_nrt. i
5rl _ l l . .l _ l . .;i I p._fi_i l ni ° —i 1 -
6. Regulation resistance - I. Additional resistance in series vn_=_=gn=r _
across the shunted wintzling otthe voltage regulator-10. Damp» _ 2_ "'9"":1___L§1 _, -=s~1i{i€1 I For -o==__:1_=v 1
ing resistance -1?. Additional resistance 1|'! SEHES across the ' ;|l i;.-.-»?. %§[""'F-;;;. x ;,l;%_';_._"' : '_:"_=' - 5;-, !
/ " " m * " * * " : : : : ~ \ .
W/ ' > J. § , - . . u . . . .
TEE i t
bl
ii
u- _ W. _ - /
Fig. 151. - fiectrical diagram of the control unit GP 1;'2-1,17.
shunted windings of the current regulator and cut-out relay - ; - _
a. Accelerator resistance in series with the regulation res- ,| ___£=__ i I Z = - 3 3
istance (6) - B. 12 V batteries connected in series - G. Gem , __,_ 1
erator model DC 115/'24]'7/3 and its modified versions ~ """'"' *' "" ' '*m L-*'>*~"~—' i
30' Electrical equipment terminal -31. Ground - 51. Generator
positive terminal - 6?. Generator field winding terminal, \_ J
"W W H Mic? z'|'2o*'*'
(Note: The windings of the three elements of the control
box drawn with light lines are shunted across the generator "-- _
circuit, those drawn with black lines are connected in series}. E
'$.';._B
_ f
J;
Then the field winding current and consequently the generator voltage increase resulting in there-opening
of the contacts. The cycle repeats itself and an oscillation of the at-matures is maintained to keep tho
voltage within the setting limits.
The function of the acceleration resistance (a) is to increase the oscillation frequency or the voltage
regulator which reduces its pull on the armature (2). in tact, as the contacts open the field winding
current going through the acceleration coll creates a magnetic field which is subtracted from the one
created by the"'regulator shunt winding and therefore reduces the magnetic pull on the armature, favouring
its release.
Should current consumption exceed a certain limit, or the battery be discharged, a great current output
will he required from the generator: this current induces a magnetic pull on the current regulator
armature sufficient to close it against the action of the springs. The contacts open and insert through
the generator field winding circuit the regulation resistance and the acceleration coil with the same
results described above in the case of the voltage regulator, in this case it is the current which is con-
tained within set limits. if the current output requirements remain above said limit, the current regulator
armature keeps on oscillating substituting the voltage regulator one, which remains at rest.
To conclude, the current regulator limits the maximum current output of the generator, whilst the
voltage regulator ensures through the system a voltage ranging within pre-determined limits (calibration
limits), not harmful to the battery, for all the charging range which requires an output below the maximum
values from the generator, equipment and battery.
The maximum power is reached at the operational limit between the two units (current and voltage
regulators} and is also known as peak-load.
9?
l
E
i _ .