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VOLTAGE REGU LATO'R
DESCRI PTION
Fig. 3-20. Voltage regulator fitted
VOLVO
103297
The regulator, Fig.
3-20,
is
a
twin
conta'
c t regulator
with
one
upper
contact
which is
movabl
e
and a
lower,
fixe
d contact. The
movable
co
ntact is
sec
ured
to an
armature
which
is
influenced
by a voltage coi!. The
regulator also
contains
four resistances and
one ther-
mistor.
FUNCTlON
When theignition key is switch ed on, current f10ws
through the charging warning lamp to +(61) on the
regulator. It is then conducted via the regulator
through the field winding to earth.
When the alternartor starts rotating, alternating cur-
rent is formed in the stator. This alternating current is
rectified by the
si~icon
diodes and the d-i:rem
ourr'
e nt
produced is re-fed via the regu.lator
to
the field wind-
ing until the regulating voMage has been reached.
3:8
...---......
- - 0
+
(
61
)
I
~-+--"""'--o
EXC
(O
F)
-
(0
-)
VOl
vo
IU;13
76
Fig. 3-21.
Inner
wiring of regulator
Sl
Voltage
winding
S2 Acceleration winding
Rl
Regulator
resista nces (2)
10
·
10
%
R2 Damping resistance
30
.
10
%
R3 Compensation
resistance (adapted to
RT during manufacture)
RT Compensation
therm i stor a
pprox.
4
at 25
°
C
(lr
F)
When the
'regulaJ
ting voltage has been reached
the
arma,
t ureis o#raded by the cai!. This ,oauses
the
con-
tams to
open
and
~he
~i,€ild
curreni"
must pass the resi-
stances
R1,
nig.
3-21.
If in spite of this,
the
voltage rises, the armature is
drawn further down and the movable contact meets
the lower contact so that the field winding is earthed
at both ends, this causing the voltage to drop rapidly.
The cycle is
repeated
continuously so that the voltage
is maintained constant.
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