Volvo 819 E - Page 46

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 ol unit' (210) consists of a number of electronic circuits operating a power circuit whi ch contro ls 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 Hall
generator in the distributor (5) and ensures that the ignition coil is fully charged between pulses. The 'co ntrol unit'
also features a s tand ing cur r ent cut- off fun ct ion wh ich prevents overheat ing of the ignition co il by interrupting the
cu rrent if no speed signals are present.
' Control unit' connections :
1. Controls igni t ion coil (4) primary cu rrent
2. Ground terminal
3. Hall generator ground term inal
4. Power supply (12 V)
5. Hall
generator power supp ly ( 12 VI
6. Receives
engine speed and crankshaft position signals fr om Hall generator
44