AUTOMATIC START/STOP SYSTEM
The main function of the control panel is to con-
trol the start and shutoff of the engine.
AUTOMATIC START/STOP CONTROL PANEL
1. Overcrank light (OCL). 2. Low lubricating oil
pressure light (OPL). 3. Overspeed light (OSL). 4.
Automatic control switch (ACS). 5. High water
temperature light (WTL).
The engine control on the automatic start/stop
control panel is an automatic control switch (ACS) with
four positions. The positions of switch (4) are: OFF/
RESET, AUTO, MAN and STOP. Each light (i), (2), (3)
and (5) goes ON only when a not normal condition in the
engine stops the engine. The light for the condition in
the engine that stopped the engine is ON even after the
engine has stopped. Switch (4) must be moved to the
OFF/ RESET position for the light to go OFF. Each light
will go ON, for a light test, when the light is pushed in
and held in.
When the generator is to be used as a standby
electric power unit, the automatic control switch is put in
the AUTO position. Now, if the normal (commercial)
electric power stops, the engine starts and the generator
takes the electric load automatically. When the normal
(commercial) electric power is ON again, for the electric
load, the circuit breaker for the generator electric power
automatically opens and the generator goes off the
electric load. After the circuit breaker for the generator
opens, the engine automatically stops.
When the automatic control switch (ACS) is moved
to the MAN position, the engine starts. It is
now necessary for the circuit breaker for the generator
electric power to be closed manually. If the generator is
a standby electric power unit and the automatic control
switch (ACS) is in the MAN position when normal
(commercial) electric power is ON again, the generator
circuit breaker opens and the engine stops automatically
the same as when the switch (ACS) is in the AUTO
The engine will stop with the automatic control switch
(ACS) in either the AUTO or MAN positions if there is a
not normal condition in the engine. The not normal
condition in the engine that can stop the engine is either
low lubricating oil pressure, high engine coolant (water)
temperature or engine overspeed (too much rpm).
When any of these conditions stops the engine, the light
for the not normal condition will stay ON after the engine
is stopped. The fourth not normal condition light is ON
only when the starter motor runs the amount of seconds
for the overcrank timer (engine does not start).
Move the automatic control switch (ACS) to the OFF/
RESET position and the not normal condition lights go
The components of the electric set are: the engine,
the generator, the starter motor, the battery, the shutoff
solenoid and signal switches on the engine. The electric
set gives emergency power to drive the load.
An explanation of each of the signal components is
given in separate topics.
The following wiring diagrams are complete to show
the connections of the automatic start/stop components
with the engine terminal strip (TSI). The diagrams show
all available options for both the hydraulic governor
application or the PSG Governor application.
For a more complete explanation of operation of the
automatic start/stop system, refer to Floor Standing
Switchgear Form No. SENR7970.