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 ELECTRIC PROTECTIVE SYSTEM
SYSTEMS OPERATION
ENGINE RUNS AT RATED SPEED: NO FAULTS
With no existing problems and engine running at
rated speed, or at some speed above the oil step
speed setting, the circuit will look like Fig. 4. The oil
pressure step switch (OPSS) at line 36 is now
closed, but oil pressure switch (OPS2) is now open,
so there is still no current flow to TD2. The engine will
continue to run with these conditions.
OPS2 will not open until there is at least 280 kPa
(40 psi) oil pressure available, and after opening, will
not close again until the oil pressure has dropped
below 240 kPa (35 psi). The ESS(OPSS) switch is
not activated to open until engine speed is the same
as, or above, the step oil pressure speed setting.
After it is activated, the ESS(OPSS) switch has a 9
second delay before it closes. This makes sure that
oil pressure has time to increase enough to open
OPS2, or system would constantly activate engine
shutdown.
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