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Chapter 9 Electrical System
_4._A_lt_e_rn_a_t_or _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
3,4JH3(B)(C)E
4-5
Alternator functioning
(1)
IC regulator
The IC regulator is the transistor (Tri) which is series-
connected with the rotor. The IC regulator controls the
output voltage of the generator by breaking or conduc-
ting the rotor coil (exciting) current.
When the output voltage of the generator is within the
standard value, the transistor (Tr1) turns on. When the
voltage exceeds the standard value, the Zener
diode goes on and the transistor(Tr1) turns off.
With the repeated turning on and off of the transistor,
the output voltage is kept at the standard value. (Refer
to the circuit diagram below.)
{2)
Charge lamp
When the transistor (Tr1) is on, the charge lamp key
switch is turned to ON, and current flows to R 1,
R4
and to Tn to light the lamp. When the engine starts to
run and output voltage is generated in the stator coil,
the current stops flowing to this circuit. turning oft the
charge lamo.
(3)
Circuit diagram
I
D1-D3
D1-0g
~
L.
Rotor coil
04-06
F
r
I
I
I
I
I
L
E
Regulator
AC
generator
BAT:
D10:
L:
ZD:
E:
4-6 Handling precautions
(1)
Be careful of the battery's polarity (+,-terminals). and
do not connect the wrong terminals to the wrong
cables, or the battery will be short-circuited by the gen-
erator diode.
In this case too much current will flow, the IC regulator
and diodes burn out. and the wire harness will burn.
(2)
Make sure of the correct connection of each terminal.
(3) When quick-charging, etc., disconnect either the bat-
tery terminal on the AC generator or the terminal on
the battery.
(4)
Do not short-circuit the terminals
(5)
Do not conduct any tests using high tension insulation
resistance. (The diodes and IC regulator will burn out.)
BAT
R,
R
1""' ~
switch
...
: Battery
-'-
R3
_ _J
E
_ _j
Generator output terminal
IC protecting diode
Charge lamp terminal
Zener diode
D1-Ds:
Output commutation diode
R1-R4:
Resistor
D1-D9:
Charging lamp switching diode
F:
To supply current to rotor coil
Earth
Rn:
Thermistor
Tri, Tr2: Transistor
(Temperature gradient resistance)
9-24
Printed in Japan
HINSHr-H8009
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