Group
28
Ignition
systems
D
esign and function
-
System descriptions
30
5
+
210
0
5
6
3
4
2
1
0
TZ·28H
B19E1ET, B23E
,
B230A
6
15
1
TZ-28H
o
o
15
o
3
o
The
'co
ntr
o
l
unit' (210) consists of a number of electronic circuits operating a
power
circuit
whi
c
h
contro
l
s
the pri-
mary
c
urrent in the
ignition coil.
The
'control
unit' interrupts
the
current on
receipt
of
an ignition pul
se
from
t
he
generator
in
the
distributor
(5)
and
ensures
that the
ignition
coil
fully
cha
rged
between pu
l
ses.
The
'co
ntrol
unit'
also feature
s
a
s
tand
ing cur
r
ent cu
t
-
off
fun
c
t
ion
wh
ich
prevents
overhea
t
ing
of
the ignition
co
il by interrupting the
cu
rrent
no
speed signals
are present
.
'
Control unit' connections
:
1.
Controls igni
t
ion coil
(
4
)
primary
cu
rrent
2. Ground terminal
3
.
generator ground
term
inal
4
.
Power
supply
(
12
V)
5
.
Hall
generator power
supp
ly (
12
V
I
6
.
Rece
ives
engine speed
and
crankshaft position signals
fr
om
Hall
generator
44
