M.5
ELECTRICAL
SYSTEM
68
mm
STROKE
SERIES
WSM,
01
160
io
I
01
72F053
r
I
_-
I)
A
31
72F055
2)
At
Starting
When key
switch
is
turned to position
2,
coil of
starter relay
is
energized and starter starts engine.
GEN also starts generation for charging and LAMP
is
turned off.
In
detail,
with
GEN starting, current flows to base
of
Q1
through the route of GEN
-
D1
-
emittedbase
of
Q1
-
R4
-
D4
-
GEN, or GEN
_--+
D2
---
emittedbase of
Q1
---.
R4
---.
03
---+
GEN, and
therefore current also flows through
Q1,
short-
circuiting emitter and base of
Q2.
As
a result, base
current
of
42
is
interrupted,
42
is
turned off and
accordingly current to LAMP
is
also interrupted.
3)
In
Charging
Because BATT terminal voltage just after engine
start
is
lower than setting value
(14
to
15V),
or
lower
than
zener lever of
Z1,
current
is
not supplied to base
of
44
and
44
is
off, as shown
in
Fig.
2.
Q3
is
on
with
base current which
flows
through the route of BATT
-
--
emitter/base of
43
---
R2
---
D6
---
BATT, and
gate current
is
supplied
to
SI
or
52
through the route
of GEN
--
D1
1-
emitter/collector of
43
-
R3
-
gatelcathode of
S2
-
GEN, or GEN
---
D2
---
ernitterkollector of
43
--
R3
--
gatekathode of
SI
When engine speed
is
increased
so
that
GEN
generation voltage becomes higher than BATT
terminal voltage51 or
52
is
turned on and, as shown
in
Fig.
3,
charge current
is
supplied to BATT through
the route of GEN
-
D1
-
BATT
-
anodelcathode
of
anodekathode of
SI
---
GEN.
After
SI
or
52
is
turned on, collector current of
Q1
and base current of
43
are supplied by GEN, not
BATT.
When key switch
is
returned to position
1
after
engine
is
started, BATT
is
charged, if BATT terminal
voltage
is
lower than the setting value, or zener level
of
ZI.
-..--
GEN.
S2
-
GEN, or GEN
---
D2
---
BATT
---
4)
Over-Charge Protection
When BATT terminal voltage
is
higher than the
setting value or zener level of
ZI,
BATT
is
not charged
by the function of circuit
as
shown
in
Fig.
4.
That
is,
Qa
is
on
with
base current
which
flows through the
route of BATT
---
emitter/base of
Q4
---
Z1
---
DI;
--
-
BAIT, shortcircuiting emitter and base of
Q3.
Therefore,
Q3
is
off
with
no base current and gate
current
is
not supplied to
51
and
S2.
Consequently
SI
and
S2
are off and BATT
is
not charged.
M-43
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