1-2
1.2 SAFETY DEVICES (Refer to Table 1-2.)
System components are protected from damage
caused by unsafe operating conditions by automatically
shutting down the diesel engine when such conditions
occur. This is accomplished by the safety devices
FBS,
LOP
or
OTS
. These safety devices monitor system
operating conditions and open a set of electrical contacts
when an unsafe condition occurs. Opening one or more
of these safety switch contacts will de-energize the fuel
solenoid.
De-energizing fuel solenoid releases the stop-run
lever to the
STOP
position, shutting off the fuel supply to
the engine; thus stopping the engine.
The A-C generator and the glow plug circuit are
protected by circuit breakers (listed below) but will not
shut down the engine if an overload occurs.
Table 1-2. Safety Devices
Unsafe Condition
Safety Switch
Switch Setting
a. Engine
1. Broken fan belt
1. Fan belt switch (FBS)
1. Trips when belt breaks
2. Excessive current draw by FS,
2. Circuit breaker (CB-2) ---
2. Trips at 20 amps
FH, S, SS or TT
Automatic reset
3. Low engine lubricating
3. Oil pressure switch (LOP) ---
3. Opens below 26 psig
oil pressure
Automatic reset
(1.83 kg/cm
@
)
4. High oil temperature
4. Oil temperature switch (OTS) ---
4. Closes at 266
_
F
Automatic reset
(130
_
C)
b. Glow Plugs
1. Excessive current draw
1. Circuit breaker (CB-3) ---
1. Trips at 50 amps
on glow plug circuit
Automatic reset
c. Generator
1. Excessive current draw
1. Circuit breaker (CB-1) ---
1. Trips at 26 amps
by generator
Manual reset
(460 vac)
2. Excessive current draw
2. Circuit breaker (CB-4) ---
2. Trips at 48 amps
by generator
Manual reset
(230 vac)
