Theory of operation, Gasoline engine – Lincoln Electric CLASSIC SVM194-A Manuel d'utilisation
Page 114
THEORY OF OPERATION
E-4
E-4
CLASSIC® 300D & 300G
BATTERY, STARTER, ENGINE,
ALTERNATOR & PROTECTION
CIRCUITS
The 12VDC battery powers the starter motor and,
through the ignition switch, the engine protection cir-
cuitry. In the event of a low oil pressure or a high
coolant temperature condition, the engine protection
system shuts the engine off.
The idle / engine protection PC board or, the engine
control unit (ECU) monitors the oil pressure sensor,
and the coolant temperature sensor. If either sensor “
faults,” the engine is shut down.
The engine alternator supplies “charging” current for
the battery circuit. If the alternator would cease to func-
tion correctly, due to a broken fan belt or other mal-
function, the engine protection system would shut the
engine down.
FIGURE E.4 - BATTERY, STARTER, ENGINE, ALTERNATOR & PROTECTION CIRCUITS
(Classic® 300G, Zenith Fuel System/GM Engine)
NOTE: Unshaded areas of Block Logic
Diagram are the subject of discussion
+
-
ZENITH
E.C.U.
BATTERY
STARTER
MOTOR
START
AMMETER
IGNITION
SWITCH
ENGINE
ALTERNATOR
ENGINE FAILURE LAMP
HOUR METER
FUEL PUMP
IDLE
SWITCH
ENGINE
RPM CONTROL
GASOLINE
ENGINE
ENGINE
CONTROL
COMPONENTS
AND
SENSORS
NEGATIVE
OUTPUT
TERMINAL
POSITIVE
OUTPUT
TERMINAL
CURRENT
SENSOR
P.C. BOARD
115 & 230VAC
RECEPTACLES
SELECTOR
SWITCH
GENERATOR
FRAME
ALTERNATOR STATOR
ROTATOR
FIELD
RECTIFIER
GENERATOR
FIELD CONTROL
RHEOSTAT
FLASHING
SLIP
RINGS
ARMATURE
SHAFT
SERIES
COILS
FIELD
SHUNT
WINDINGS
RESIDUAL
MAGNETISM
INTERPOLE
COILS
GENERATOR
ARMATURE
MECHANICAL
COUPLING
B
R
U
S
H
E
S
&
C
O
M
M
U
TA
TO
R