Kohler Understanding Fault Shutdowns in the 12RES Generator

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	Not used.	—
	input shutdown
HE	High engine	Shutdown occurs if the engine coolant temperature exceeds	Check for blocked air inlets and exhaust
	temperature	the maximum temperature for more than 5 seconds. This	outlets.
	shutdown	protective becomes active after the engine reaches the crank
		disconnect speed.
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 occurs if a low oil pressure condition exists for more	Check for leaks in the lubrication system.
	shutdown	than 5 seconds. This protective becomes active 30 seconds	Check the oil level and add oil if the level
		after the engine has reached crank disconnect speed
			is low.
		(30 second inhibit).
		Note: The low oil pressure shutdown does not protect against
		low oil level. Check the oil level at the engine.
OC	Overcrank	Shutdown occurs after 3 unsuccessful starting attempts. The	Check the fuel supply, spark plug, and
	shutdown	crank cycle is set for three starting attempts of 15 seconds	battery.
		cranking and 15 seconds rest.	Check for loose connections.
		The generator set also shuts down if no engine rotation is	Contact an authorized distributor/dealer for
		sensed during cranking. Shuts down 1 second after the fault is	service if problem continues.
		detected.
OF	Overfrequency	Shutdown occurs when the governed frequency exceeds 110%	Contact an authorized distributor/dealer for
	shutdown	of the system’s frequency setpoint for more than 5 seconds.	service if problem continues.
		This protective becomes active 10 seconds after engine start
		(10 second inhibit).
OS	Overspeed	Shutdown occurs if the engine speed exceeds 115% of the	Contact an authorized distributor/dealer for
	shutdown	normal running speed for more than 0.3 seconds.	service if problem continues.
OU	Overvoltage	Shutdown occurs if the voltage exceeds 120% of the system	Contact an authorized distributor/dealer for
	shutdown	nominal voltage for more than 2 seconds.	service if problem continues.
UF	Underfrequency	Shutdown occurs when the governed frequency falls blow 90%	Reduce the load and restart the generator
	shutdown	of the nominal system frequency for more than 5 seconds.	set.
		This protective becomes active 10 seconds after engine start.	Contact an authorized distributor/dealer for
		(10 second inhibit).
			service if problem continues.
UU	Undervoltage	Shutdown occurs if the voltage falls below 80% of the nominal	Reduce the load and restart the generator
	shutdown	system voltage for more than 10 seconds.	set.
			Contact an authorized distributor/dealer for
			service if problem continues.

Figure 2-3 ADC 2100 Fault Shutdown Codes

TP-6331 5/04 Section 2 Operation 5