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TP-6331 5/04 5Section 2 Operation
2.4 Fault Shutdowns
The generator set shuts down automatically under the
fault conditions listed in Figure 2-3 and the controller
displays a fault code. The generator set cannot be
restarted until the fault condition is corrected and the
controller is reset. See Section 2.4.1 to reset the
controller after a fault shutdown. The controller resets
automatically after a battery voltage fault condition is
corrected.
The shutdown switches on the generator set
automatically reset when the problem is corrected. The
high engine temperature switch automatically resets
when the generator set cools. However, the fault does
not clear until the controller is reset.
The controller displays a fault code but the generator set
does not shut down under the conditions shown in
Figure 2-4.
Code Fault Description Check
AF Auxiliary fault
input shutdown
Not used. —
HE High engine
temperature
shutdown
Shutdown occurs if the engine coolant temperature exceeds
the maximum temperature for more than 5 seconds. This
protective becomes active after the engine reaches the crank
disconnect speed.
Check for blocked air inlets and exhaust
outlets.
LCL Low coolant level Not used on air-cooled models. —
LOC Loss of coolant Not used on air-cooled models. —
LOP Low oil pressure
shutdown
Shutdown occurs if a low oil pressure condition exists for more
than 5 seconds. This protective becomes active 30 seconds
after the engine has reached crank disconnect speed
(30 second inhibit).
Note: The low oil pressure shutdown does not protect against
low oil level. Check the oil level at the engine.
Check for leaks in the lubrication system.
Check the oil level and add oil if the level
is low.
OC Overcrank
shutdown
Shutdown occurs after 3 unsuccessful starting attempts. The
crank cycle is set for three starting attempts of 15 seconds
cranking and 15 seconds rest.
The generator set also shuts down if no engine rotation is
sensed during cranking. Shuts down 1 second after the fault is
detected.
Check the fuel supply, spark plug, and
battery.
Check for loose connections.
Contact an authorized distributor/dealer for
service if problem continues.
OF Overfrequency
shutdown
Shutdown occurs when the governed frequency exceeds 110%
of the system’s frequency setpoint for more than 5 seconds.
This protective becomes active 10 seconds after engine start
(10 second inhibit).
Contact an authorized distributor/dealer for
service if problem continues.
OS Overspeed
shutdown
Shutdown occurs if the engine speed exceeds 115% of the
normal running speed for more than 0.3 seconds.
Contact an authorized distributor/dealer for
service if problem continues.
OU Overvoltage
shutdown
Shutdown occurs if the voltage exceeds 120% of the system
nominal voltage for more than 2 seconds.
Contact an authorized distributor/dealer for
service if problem continues.
UF Underfrequency
shutdown
Shutdown occurs when the governed frequency falls blow 90%
of the nominal system frequency for more than 5 seconds.
This protective becomes active 10 seconds after engine start.
(10 second inhibit).
Reduce the load and restart the generator
set.
Contact an authorized distributor/dealer for
service if problem continues.
UU Undervoltage
shutdown
Shutdown occurs if the voltage falls below 80% of the nominal
system voltage for more than 10 seconds.
Reduce the load and restart the generator
set.
Contact an authorized distributor/dealer for
service if problem continues.
Figure 2-3 ADC 2100 Fault Shutdown Codes