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 ELECTRIC PROTECTIVE SYSTEM
SYSTEMS OPERATION
ENGINE SHUTDOWN DUE TO FAULT:
LOSS OF ENGINE OIL PRESSURE
(AT ENGINE SPEEDS ABOVE OIL STEP
SPEED SETTING)
The circuit of Fig. 5 shows the current flow if there is a fault in
the high pressure side of the oil pressure circuit. When engine
oil pressure drops below 240 kPa (35 psi), oil pressure switch
(OPS2) will close. Since the engine is running at a speed above
the step oil pressure setting, ESS(OPSS) switch is already
closed and the circuit is now completed to Control 1 (terminal 1)
of time delay relay (TD2). There is no time delay at Control 1,
so TD2 relay contacts (line 20) will close immediately across
terminals TD2-6 and TD2-7. This makes a complete circuit
from the battery through TDI contacts (line 25) to activate oil
pressure indicator (OPI) and to energize slave relay (SR1).
When SR1 is energized, contacts across terminals SR 1 - 1
and SR 1-2 open and contacts across terminals SR 1-1 and SR
1-3 close. The circuit is now completed to energize fuel shut-off
solenoid (FSOS), and the fuel is shut off to the engine.
524
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