2-4 Operation TP-5592 7/96
Circuit Protection
AC circuit breakers (optional) trip when a fault is
detected in the output circuit. Correct the fault and then
place the AC circuit breaker(s) in the ON position to
reset. Restart the unit. See Figure 2-2 for AC circuit
breaker ratings. Base circuit breaker selection on
voltage configuration for each model.
Voltage
(max.)
Number of
Poles
AC Circuit
Breaker (Amps)
250 1 50
250 1 70
250 1 80
240 2 50
240 2 60
240 2 70
240 2 80
240 2 90
600 3 20
600 3 30
600 3 40
480 3 50
600 3 60
600 3 70
Figure 2-2. AC Circuit Breakers
DC Circuit Breaker (10 amp) will trip when a fault
occurs in the controller circuit. See Section
4—Troubleshooting. Correct thefault and thendepress
the center button of the DC circuit breaker to reset.
Restart the unit.
Voltage regulator fuse (8 amp)protects in case offault
inthevoltageregulatorand/orgeneratorcircuit. Correct
thefault and thenreplace the fuse withanewfuseofthe
same rating. Voltage regulator circuit is then functional.
Battery charging fuse is a 10 amp fuse that protects
the battery charging alternator, battery charging
regulator, and circuitry. Correct the fault and then
replace the fuse with a new fuse of the same rating.
Battery charging circuit is then functional.
Engine Safety Shutdown Switches
Four shutdown switches protect the engine. These
switches automatically reset after correcting the
problemor cooling downthe unit (ifoverheating wasthe
problem). The following conditions will cause a
generator set shutdown:
Low Oil Pressure (LOP)
High Water Temperature (HWT)
High Exhaust Temperature (HET)
Overspeed
Engine safety shutdown switches become functional
when unit comes up to speed and AC voltage is
available.
High Exhaust Temperature (HET) of 215°F (102°C) or
greater will shut down the unit.
Low Oil Pressure (LOP) of 6.8 psi (47 kPa) or less will
shut down the unit.
NOTE
TheLowOilPressure(LOP)switchdoesnotactasalow
oil level switch. Check oil level regularly to protect
against damage from low oil level.
High Water Temperature (HWT) of 203°F (95°C) or
above will shut down the unit.
Overspeed (overfrequency) will immediately shut
down the unit at 70 Hz or greater.