SAFETY
SHUTDOWN
SWITCHES
.
SAFETY
SHUTDOWN
SWITCHES
The engine
is
protected
by
a variety
of
shutdown switches.
Should a shutdown
occur,
do
not attempt
to
restart without
finding and
correcting tlie cause. Refer
to
the heading ·
Engine
starts,
nms and
then
shuts
down
in
the
ENGINE
TROUBLESHOOTING
section
of
this manual. .
The following is a description
of
these automatic shutdown
switches:
EXHAUST
TEMPERATURE
SWITCH
Exhaust
Temperature
Switch
An exhaust temperature switch
is
located
on
the exhaust
elbow. This switch will open and interrupt the
DC
voltage
to
the ignition coil (which turns OFF the engine), should the
switch's sensor
indicate an excessive exhaust temperature
(an
inadequate supply·
of
raw water coolant causes high exhaust
temperatures). This
switch opens at 260° - 270° F
(
127°
- 132° C) and resets
at
approximately 225°F (107° C).
High
Water
Temperature
SWitch
A high water temperature switch
is
located
on
the thermostat
housing. This switch will open and intenupt the
DC
voltage
to the ignition coil (which turns
OFF the engine), should
the
fresh water coolant's operating temperature reach
approximately
205° F (96° C).
This switch resets at
195°
F
(1
OT
C).
low
Oil
Pressure
Switch
A low oil pressure shutdown switch
is
located off the
engine's
oil
gallery. The switch is·kept closed
by
engine oil
pressure.
Should the engine's oil pressure fall
to
10 -
15
psi,
the
switch
will open interrupting the
DC
vo!cage
to
the
ignition coil (which turns OFF
the
engine).
LOW
Oil
PRESSURE
SWITCH
Oil
FILTER.
High
RPM
Shutdown
SWitch
An
overspeed shutdown switch shuts OFF the generator set.
by
grounding out
the
ignition system should
the
engine's
speed reach approximately 2175 rpm. Reset
the
switch
by
momentarily depressing the STOP switch. (Make sure
the
cause
of
the engine overspeed shutdown
is
corrected).
Engine
Circuit
Breaker
The.
generator's engine
is
protected
by
an
engine
mounted
manual reset circuit breaker (20
amps
DC).
Excessive current
draw
or electrical overload anywhere
in
the instrument panel
wiring or engine wiring
will
cause the breaker
to
trip.
In
this
event the generator will shut down because the opened
breaker interrupts the DC circuit
to
the
K2-run
relay.
If
this
should occur, check and repair the source of the
problem.
After repairing the fault, reset the breaker and restart
the
generator.
Overspeed
PC
Board
Inside the Control Box on the generator is a solid state
Overspeed PC Board.
It
monitors engine rpm via ignition
coil pulses.
If
these pulses reach a preset point. The PC
Board grounds the ignition and shuts the generator down.
Press the STOP switch to re-set the
PC
Board.
(For test purpose
ONLY to determine a faulty PC Board
that
will not re-set. Lift the
Tl
connection
off
the board
and attempt to start the generator).
. Engines"& Generators
11
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