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 ELECTRIC PROTECTIVE SYSTEM
SYSTEMS OPERATION
MANUAL START
Electric Starter Motors (Fig. 2)
When the start pushbutton (PB) or remote start switch (RSS) is
pushed, current will flow through starter motor magnetic switches (SMMSI
and SMMS2). With magnetic switches energized, contacts (SMMSI and
SMMS2) close and pinion solenoids (PS I and PS2) are energized. This
causes contacts (PS 1I and PS2) to close, and starter motors (SMI and
SM2) will now crank the engine. When engine starts to run and the rpm
increases to the speed of the crank terminate (CT) speed setting, the
ESS(CT) switch will automatically open across terminals ESS-l I and ESS-
12 to stop current flow to the start pushbutton.
Air Starter Motor
(Current Flow Not Shown in Fig. 2)
If engine has an air starter motor, current will flow through DC operated
air start solenoid valve (ASSV) when start pushbutton (PB or RSS) is
pushed. The ASSV will open the air supply to the air starter motor, which
will now crank the engine. When the engine starts to run and the rpm
increases to the speed of the crank terminate (CT) speed setting, ESS(CT)
switch will automatically open across terminals ESS-11 and ESS-12 to stop
current flow to ASSV pushbutton. This will move the valve to shut off the
air supply to the air starter motor.
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