TP-6195 1/04 5Section 2 Operation
2.3.4 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 2.3.5 to reset the
controller after a fault shutdown. The controller resets
automatically after a battery voltage fault c ondition 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
Input from a customer-supplied switch that closes when the
fault is active. The generator set shuts down and will not start
when the fault is active (input is grounded).
Check the cause of the auxiliary fault.
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.
LOP Low oil pressure
shutdown
Shutdown occurs if a low oil pressure condition exists 7
seconds after the engine has reached crank disconnect speed.
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 after 1 crank attempt if no
speed signal is sensed. 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 1 second.
This protective becomes active 30 seconds after engine start.
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 1 second.
Contact an authorized distributor/dealer for
service if problem continues.
OU Overvoltage
shutdown
Shutdown occurs if the voltage exceeds 120% of the voltage
regulator setpoint for more than 1 second.
Contact an authorized distributor/dealer for
service if problem continues.
UF Underfrequency
shutdown
Shutdown occurs when the governed frequency falls 1 Hz
below the system’s frequency setpoint for more than 1 second.
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 voltage
regulator setpoint for more than 1 second. This protective
becomes active 30 seconds after engine start.
Reduce the load and restart the generator
set.
Contact an authorized distributor/dealer for
service if problem continues.
Figure 2-3 ADC Fault S hutdown Codes
Code Fault Description Check
HB High battery
voltage warning
Fault code is displayed if the engine starting battery voltage rises
above 16 VDC for a 12 VDC system or above 30 VDC for a
24 VDC system for more than 10 seconds when the engine is not
running. This fault condition does not inhibit engine starting.
The fault condition clears when the battery voltage returns to a
voltage within the limits for more than 10 seconds.
Check the battery rating and condition.
Check the battery charger operation.
LB Low battery
voltage warning
Fault code is displayed if the engine starting battery voltage falls
below 8 VDC for a 12 VDC system or below 16 VDC for a 24 VDC
system for more than 10 seconds when the engine is not running.
This fault condition does not inhibit engine starting.
The fault condition clears when the battery voltage returns to a
voltage within the limits for more than 10 seconds.
Check the battery rating and condition.
Check the battery charger operation.
Charge or replace the battery.
Figure 2-4 ADC Fault Warning Codes
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