Page 1
M.6
ELECTRICAL
SYSTEM
70mm
STROKE
SERIES
WSM.
602010
~ ~ ~~ ~
Speed in normal use
Charging performance
li]
ELECTRICAL
SYSTEM
~~ ~~
1600 to
5600
rpm
Over 14Aat5200 rpm
0107FO42
I
i
fL
f
L
The electrical system
of
the engine consists
of
a
starting system (including a starter,'glow plugs, etc.),
a
charging system (including a alternator, regulator,
etc.),
a
battery and an oil switch.
[Z]
CHARGING SYSTEM
(1)
Alternator
1032FO22
(1) Oil Switch
(2)
GlowPIug
(3)
Alternator
(4)
Regulator
(5)
Battery
(6) Starter
(7) OilLamp
(8)
Glow Plug Indicator
(9)
Key Switch
(10)
Charge Lamp
*W,
(7).
(8).
(9)
and
(10) are not included
in the basic engine.
This alternator
is
an
8
pole rotating magnet type
generator. It
is
simple in construction, consisting
of
a
stator and rotor.
The rotor
is
made up
of
eight permanent magnet
pole pieces assembled on
a
shaft and rotates on the
center
of
the stator around which eight
electromagnetic coils are provided.
This
alternator
produces higher voltage
in
slow
speed rotation, and
charges electric current to the battery during engine
idling.
I
Rotation direction
I
Clockwise (as seen from pulley side)
I
Charge
starting
speed Over
1800
rprn
I
M-33
Redistribution or publication of this document
by any means, is strictly prohibited.
Page 2
N1-6
ELECTRICAL
SYSTEM
70
mm
STROKE
SERIES
WSM.
60201-0
(2)
Regulator
0302P006
When the key switch
is
turned
"ON"
@
3302F067
I
When the engine
starts
A
regulator has
two
functions:
1.
When the battery voltage
is
low,
it
turns
the
SCR
on to form a charging
circuit
to
the battery.
2.
During charging,
it
turns
the charging lamp
off.
When the key
switch
is
tu'med on, current
(-+)
flows from the base of transistor T5 to resistor
R4,
resistor
R3
and to ground, turning transistor T5 on.
Then, the current
(---)
flows to the charge lamp to
light.
(1)
Light Blue
(To
alternator)
(2) Light Blue
(To
alternator)
(3) Yellow
(To
key switch AC terminal)
(4)
Green
(To
charge lamp)
(5)
Red
(To
key switch terminal
No.30)
(6) Black
(To
ground)
(7) Alternator
(8) Fuse
(9)
Charge Lamp
(10)
Key Switch
When the engine starts and a generated voltage
in
the alternator causes a current
in
f
(A) direction, the
current flows as follows:
Diode Di
-
Key Switch
-.
Transistor T4 - Resistor
R2
-
Diode D4
-
Alternator.
(B)
direction, a current flows as
follows:
Diode
D2
---
Key Switch
---
Transistor T4
---
Resistor
R2
---
Diode
03
---
Alternator.
In
both cases, the current flows to the base
of
transistor T4 to turn
14
on.
When transistor T4
is
turned .on, potential
difference between the emitter and base of
transistor
Ts
becomes zero,
turning
Ts
off. The
charge lamp then goes off.
A
capacitor
CI
is.
provided
to
stabilize voltage
across resistor
R3.
Without
this
capacitor, transistor
T4
repeats
on
and
off at
low
voltage
in
the
alternator, and the charge lamp
lights
dimly. This
capacitor eliminates the ripples
to
prevent unstable
operation.
With a current
in
M-3
5
Redistribution or publication of this document
by any means, is strictly prohibited.
Page 3
c
M.6
ELECTRICAL
SYSTEM
70
mm
STROKE
SERIES
WSM.
602014
During charging
3302FO69
Prevention
of
overcharging
!@
When the battery voltage
is
below the specified
value
(14.5
f
0.5
V)
of zener diode
ZDi,
a current does
not flow to zener diode
ZDi-
Base current of
transistor Ti does not flow, and transistor Ti
is
off-
Current flows from resistor
Ri
to the base of
transistor T2 to turn
it
on.
When transistor
T2
is
on, transistor T3
is
forward
based and turns on, allowing a gate current of
SCR's
Si
and
S2
to turn them on.
Therefore, when a generated voltage
in
alternator
causes a current
in t (A)
direction, the changing
current flows as follows:
Diode
Di
-.
Key Switch (Terminal
No.30)
-
Battery
-
Ground
-
SCR
S2
-
Alternator.
With
a
current
in
J
(B)
direction, the charging
current flows as follows:
Diode D2
---
Key Switch (Terminal
No.30)
---
Battery
---
Ground
---
SCR
Si
---
Alternator.
When the 'battery voltage rises over the specified
value of zener diode
ZDi,
a current flows
to
the base
of
transistor
Tl
through
ZDi,
turning transistor
Ti
on.
This
causes a potential difference between the base
and emitter of transistor T2
to
become zero, turning
off transistor
T2
simultaneously.
Therefore,
the
current
is
no longer supplied to the
gates of
SCR's
Si
and
S2,
turning off
SCRs
and the
charging circuit
is
cut off.
M-37
Redistribution or publication of this document
by any means, is strictly prohibited.
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