Battery Ee; Charging Circuit - Datsun 180B Service Manual

ENGINE
ELECTRICAL SYSTEM
CondItIOn
Probable cause
Correcllve actIOn
Starting
motor
Duty
or
worn Fommutator
Clean and repair
cranks slowly
Armature rubs field cOli
Replace assembly
De fec lIve
solenOId
sWitch
Repair
or
replace
sWitch
Starting
motor
Worn
pinIOn
I
Replace
pinion
operdtes
but does
J Locked
pinIOn
gUide
Repau
pmlOn
gUide
not
crank engine
Worn nng gear
Replace
nng gear
Starting
motor wdl Defecllye
solenold sWitch
Repau
or
replace
solenOId sWitch
not
disengage even
Defecllve
gear
teeth
Replace
defecllve
gear
IgmtlOn
sWitch
IS
turncd off
The
charging
CirCUit consists of the
battery
alternator regulator and
necessary
Wifing
to connect
these
parts
The
purpose
of thiS
system
IS to
convert
mcchamcal
energy
from
the
I
engine Into
electncal
energy
which
IS
used to
opcrate
all
electncally
operat
ed
umts and to keep J
e
battery fully
charged
When the
IgnitIOn
SWItch
IS
set tq
ON
current flows
from the battery
to
ground through
the
Ignlllon
sWItch
voltage regulator
IG terminal prunary
Side
contact
pOint
PI
movable
OntaLt
pOint
P2
voltage
regulator
F
terminal alternator F ternunal
field COIl
and alternator E
terrmnal
as
shown
m
Figure
EE 29
by
full line
arrow
marks Then the
rotor
In
the
alternator
IS
eXCIted On the
other
hand
current
flows from
the
battery
to ground through
the
Igml10n SWl
tch
warmng
lamp
voltage
regulator
L
terrmnal
lamp
Side
contact
pOint
P4 movable
contact pOint
P5
and
voltage regulator
E
terrmnal
as
shown
by
dotted lIne
arrow
marks
CHARGING CIRCUIT
Then the
warmng
lamp lIghts
When
the alternator
beginS to
operate
three
phase alternating
cur
rent
IS
Induced
In
the armature ThiS
alCernatlng current
IS
recl1fied by the
poslllve
and
neg lIve
SIlIcon diodes
The
recllfied direct
current
output
reaches the alternator
A
and E
ter
nuIlals
On the
other hand the
neutral
pOint voltage
feaches
N and E
terrmnals
nearly
a
half
of
the
output
voltage
and
current
flows from
voltage
regulator
N
termlnal
to E
terrmnal
or
ground
through
the cod
VCI
as
shown
In
Figure
EE 30 by
the
dotted hne arrpw marks Then the
cod VC
I
IS
eXCited and
the
movable contact
pOint
P5
comes
Into contact wIth
voltage
wmdlng
Side
contact pOint
P6
ThIS
acl10n
causes
to turn
off the
warning
lamp
and
complete
thc
voltage
Winding
CUCUlt
as
shown
by
the full line arrow
marks
When the alternator speed
IS in
creased
or
the
voltage starts to
nse
excessIvely
the movable
contact
pOint
EE ll
P2
IS
separated
from the
pnmary
Side
contact
PI
by
the
magnel1c
force of COli VC2
Therefore
reglstor
RI
IS
apphed
mto tbc field
CirCUit and
output
voltage
IS
decrcased
As the
output
voltage
IS
decreased
the
movabljl contact
pOint
P2 and
pnmary Side
contdct
PI
comes
Into
contact
once
again
and the dlternator
voltage
Increases
Thus the
rapid
VIbratIOn of the
movable contact
pOint
P2
maintains
an
alternator
output
voltage constant
When the alternator
speed
IS
further
Increased
or
the voltage
starts to
nse
excessively tbe movable
contact
pOint
P2
comes
Into contact
with
secondary
Side
contact
pOint
P3
Tlien
the field current
IS
shut off and
alternator
output
voltage
IS
decreased
Immedl8tcly
ThiS
actIOn
causes
to
separate movable
contaLt
P2 from
secondary
Ontact
P3 Thus the
rapid
vlbral10n
ofthe movablc
contact
pOint
P2
or
breaking
and
complet
Ing
the
field
CirCUit mamtalns
an
alternator
output
voltagc constant