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 ELECTRIC PROTECTIVE SYSTEM
SYSTEMS OPERATION
ENGINE RUNNING BELOW OIL STEP SPEED
SETTING: NO FAULTS
(OR JUST ACCELERATING THROUGH STEP
SPEED)
If engine continues to run below the step oil pressure
speed setting, oil pressure step switch (OPSS) will
remain open and will not complete the circuit to
shutdown as shown in Fig. 6. Since oil pressure has
increased enough to run at this speed (OPS I switch is
open), the engine can safely run at this speed and will
not be shut down.
If the engine is accelerating through oil step speed
setting, the circuit could still look as shown in Fig. 6.
When engine speed is the same as (or goes above) the
oil step speed setting engine oil pressure must increase
to 280 kPa (40 psi) to open oil pressure switch (OPS2)
within the 9 second time delay of the oil pressure step
switch ESS(OPSS). The OPSS switch will close after 9
seconds and, if OPS2 is still closed, engine will shut
down as shown in Fig. 5. If OPS2 has opened before
OPSS has closed, engine will continue to run as shown
in Fig. 4.
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