Kohler APM402, Operation

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Engine Under Speed. The fault lamp illuminates red, the alarm horn sounds, and the unit shuts down immediately when the
governed frequency on 50 and 60 Hz models drops below the under speed setting. The local display shows Eng Speed Low
Shutdwn.
File System Error. The fault lamp illuminates red, the alarm horn sounds, and the unit shuts down when the internal controller
diagnostics detect a firmware file error. The local display shows File Error Shutdwn .
Fuel Tank Leak (diesel-powered models only). The fault lamp illuminates red, the alarm horn sounds, and the unit shuts down
when the fuel tank signals a leak of the inner tank. This fault requires an optional fuel tank leak switch for the lamp to fu nction.
The local display shows
Fuel Leak Shutdwn.
High Coolant Temperature. The fault lamp illuminates red, the alarm horn sounds, and the unit shuts down because of high
engine coolant temperature. The high coolant temperature shutdown does not function during the preset inhibit time delay period
after startup. The local display shows
Coolnt Temp High Shutdwn .
Note:
The high engine temperature shutdown function and the low coolant level shutdown function are independent. A low coolant
level condition may not activate the high engine temperature switch.
Internal Fault. The fault lamp illuminates red, the alarm horn sounds, and the unit shuts down when the internal diagnostics
detect a controller malfunction. The local display shows Intern Error Shutdwn .
kW Overload. The fault lamp illuminates red, the alarm horn sounds, and the unit shuts down when the generator set supplies
more than 102% of the rated standby output kW (or 112% of the rated prime power output kW) for more than 60 seconds. The
local display shows
Total Power High Shutdwn .
Locked Rotor (failed to crank). If none of the speed sensing inputs show engine rotation within the preset time delay of initiating
engine cranking, the ignition and crank circuits turn off for the preset period and the cycle repeats. The fault lamp illuminates
red, the alarm horn sounds, and the unit shuts down after the second cycle of the preset period of cranking. The local display
shows
Locked Rotor Shutdown.
Loss of Fuel. The fault lamp illuminates red and the alarm horn sounds when the unit shuts down without receiving a signal
from the controller to do so. On diesel-fueled units this condition includes fuel pump failure, loss of fuel prime, and/or an empty
fuel tank. On gaseous-fueled units this condition includes loss of fuel pressure and/or an empty fuel tank. The local display
shows
Loss of Fuel .
Low Coolant Level. The fault lamp illuminates red, the alarm horn sounds, and the unit shuts down because of low coolant
level. Shutdown occurs 5 seconds after low coolant level is detected. Local display shows Coolant Lvl Low Shutdwn .
Low Engine Oil Level. The fault lamp illuminates red, the alarm horn sounds, and the unit shuts down because of low engine
oil level. This fault feature requires an optional low engine oil level sensor for the lamp to function. Local display shows Oil Level
Low Shutdwn.
Low Fuel Level (diesel-powered models only). The fault lamp illuminates red, the alarm horn sounds, and the unit shuts down
when the fuel tank level on diesel-fueled models approaches empty. This fault requires an optional low fuel level switch for the
lamp to function. The local display shows
Fuel Level Low Shutdwn.
Low Oil Pressure. The fault lamp illuminates red, the alarm horn sounds, and the unit shuts down because of low oil pressure.
The shutdown occurs 5 seconds after the low pressure condition is detected. The low oil pressure shutdown does not function
during first the 30 seconds after startup. The local display shows
Oil Press Low Shutdwn .
MegaJector Communications Loss (GM/PSI and Doosan gas-powered models only). The fault lamp illuminates red, the
alarm horn sounds, and the unit shuts down when the communication link is disrupted. The local display shows MJ Comm Loss.
Metering Communications Loss. The fault lamp illuminates red, the alarm horn sounds, and the unit shuts down when the
metering to controller communication link is disrupted. The local display shows MeterCommLos Shutdwn.
No Coolant Temperature Signal. The fault lamp illuminates red, the alarm horn sounds, and the unit shuts down when the
engine coolant temperature sender circuit is open. The local display shows Temp Sig Loss Shutdwn.
No Oil Pressure Signal. The fault lamp illuminates red, the alarm horn sounds, and the unit shuts down when the engine oil
pressure sender circuit is open for more than 5 seconds. The local display shows Press Sig Loss Shutdwn.