Kohler 4EFCD-Low CO, Service Manual

Page: 27 / 88

TP-6391 9/08 27 Section 4 Controller
OC Overcrank Shutdown occurs after 3 unsuccessful starting attempts.
The crank cycle is set for three starting attempts of
7 seconds cranking and 15 seconds rest. Check the fuel supply.
Check spark plug and battery.
See Troubleshooting Chart, generator
set cranks but does not start.
I/M
O/M
3.3
The generator set shuts down on an overcrank fault if no
engine rotation is sensed. Shuts down after 3 seconds of
cranking or 1 second after the fault is detected. Check for a locked rotor. 5.4
OF Overfrequency Shutdown occurs when the governed frequency exceeds
110% of the system’s frequency setpoint for more than 5
d Thi i b i 10 d
Check system frequency setting
(parameter UU) on controller. 4.11
0% y q y p 5
seconds. This protective becomes active 10 seconds
after engine start (10 second inhibit).
Check engine governing system,
controlled by the engine ECM. Engine
S/M
OS Overspeed Shutdown occurs if the engine speed exceeds 115% of
the normal running speed for more than 0.3 seconds. Check engine governing system,
controlled by the engine ECM. Engine
S/M
OU Overvoltage Shutdown occurs if the voltage exceeds 120% of the
system nominal voltage for more than 2 seconds. Check AC voltage.
Check wiring and connections.
5.7
7
UF Underfrequency Shutdown occurs when the governed frequency falls
blow 90% of the nominal system frequency for more than
5 seconds or below 59 Hz for more than 60 seconds.
This protective becomes active 10 seconds after engine
start. (10 second inhibit). Reduce the load and restart the
generator set. —
UU Undervoltage 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. —
y g 0
Check wiring and connections. 7
Check controller configuration, system
voltage and frequency (parameter UU). 4.11
Check AC voltage and adjust, if
necessary. 5.7
Replace the SCR module and test
voltage again. 4.9
Separately excite unit. 5.2
Check stator continuity. 5.3
SCF0 Software
Communication
Fault 0 Indicates a software or communication problem within
the ADC 2100. Replace the controller. 4.10
Note: O/M = Generator set Operation Manual; I/M = Generator Set Installation Manual
* Available on units with serial number 2085259 and later.
Figure 4-5 Fault Shutdown Codes