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THEORY OF OPERATION
E-2 E-2
POWERARC® 5500
ENGINE CONTROL AND IGNITION
The engine ignition is created and controlled by a fly-
wheel type magneto circuit. This circuit is shorted to
ground when the ON/OFF switch is moved to the OFF
position, thus disabling the ignition circuit and shutting
down the engine. In the event of a low oil level condi-
tion the Low Oil Level Switch will activate and short
the ignition circuit to ground. This will disable the igni-
tion circuit and shut down the engine. This is a pro-
tective function to prevent damage to the engine if the
crankcase oil level is inadequate.
FIGURE E.2 – ENGINE CONTROL, IGNITION, ROTOR & STATOR
ENGINE, EXCITATION, ROTOR
AND STATOR
A small voltage developed by the engine magneto is
fed through a diode to the rotating field coil in the rotor
via a brush and slip ring configuration. This excitation
(“flashing”) voltage mag ne tizes the rotor lamination.
The rotor is mechanically coupled to the engine. The
rotating magnet induces a voltage in the stationary
windings of the main alternator (stator).
Three separate and isolated windings are incor porated
in the stator lamination assembly. Each winding set
has a different number of turns, producing different
magnitudes of AC output voltages. The three windings
are the weld winding, the auxiliary power winding and
the field feedback winding. The field feedback wind-
ing provides rotor current during machine operation.
The output of the POWERARC® 5500 is dependent
on two criteria: the engine RPM and the amount of
current in the rotor winding.
ENGINE
STATOR
STATOR
ROTOR
REACTOR
BRIDGE
CAPACITOR
RHEOSTAT
230VAC
RECEPTACLES
OUTPUT
TERMINALS
R
OTATION
MECHANICAL
SLIP
R
INGS
R
OTOR
M
AGNETO
CIRCUIT
LOW OIL
SWITCH
RUN/STOP
SWITCH
CIRCUIT
BREAKER
115VAC
RECEPTACLES
CIRCUIT
BREAKER
NOTE: Unshaded areas of Block Logic
Diagram are the subject of discussion
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