Fault Shutdowns; Controller Resetting After A Fault Shutdown - Kohler 20-2250 kW Operation

Use the following procedure to restart the generator set
after shutdown by an emergency stop switch. Refer to
Section 2.3.5, Controller Resetting After a Fault
Shutdown, to restart the generator set following a fault
shutdown.
Emergency Stop Switch Resetting Procedure
1. Investigate the cause of the emergency stop and
correct the circuit or wiring problem(s).
2. If the remote emergency stop switch was activated,
reset the switch by replacing the glass piece. If the
controller-mounted emergency stop switch (if
equipped) was activated, reset the controller
emergency stop switch by rotating the switch
clockwise until it springs back to its original position.
Note: The controller auxiliary fault lamp lights if the
generator set master switch is in the RUN or
AUTO position
procedure.
3. Toggle the generator set master switch to the
OFF/RESET position and then to the RUN or
AUTO position to restart the generator set. The
generator set does not crank until the resetting
procedure is completed.
2.3.4

Fault Shutdowns

The generator set shuts down automatically under the
fault conditions listed in Figure 2-2.
2.3.5 Controller Resetting After a Fault
Shutdown
Use the following procedure to restart the generator set
after a fault shutdown.
Emergency Stopping, to reset the generator set after an
emergency stop.
1. Move the controller alarm horn switch to the
SILENCE position. If equipped, the audiovisual
annunciator alarm horn and lamp are activated.
Move the audiovisual annunciator alarm switch to
SILENCE to stop the alarm horn. The audiovisual
annunciator lamp stays lit.
2. Disconnect the generator set from the load by
using the line circuit breaker or the automatic
transfer switch.
3. Correct the cause of fault shutdown. See the
Safety Precautions section of this manual before
proceeding.
TP-6161 1/12
during the resetting
Refer to Section 2.3.3,
Fault Description
High engine The high engine temperature shutdown shuts
temperature down the unit 5 seconds after a fault. The
shutdown does not function during the first
30 seconds following startup. Note: The high
temperature shutdown functions only when the
coolant level is in the operating range.
Low coolant The low coolant level shutdown shuts down the
level, if unit 5 seconds after the fault. The shutdown
equipped does not function during the first 30 seconds
following startup.
Low oil The low oil pressure shutdown shuts down the
pressure unit 5 seconds after fault detection. The
shutdown does not function during the first 30
seconds following startup. Note: The low oil
pressure shutdown does not protect against low
oil level. Check the oil level at the engine.
Overcrank Overcrank shuts down the unit after 45 seconds of
continuous cranking. Shutdown occurs after
75 seconds of cyclic cranking (crank 15 seconds,
reset 15 seconds, crank 15 seconds, etc., for a
total of 75 seconds). Shutdown occurs after
15 seconds if the engine or starter does not turn
(locked rotor). Note: The controller has an
automatic restart function. The generator set
attempts to restart if the engine speed drops
below 390 rpm (output frequency of 13 Hz).
Continued low engine speed causes an overcrank
fault condition.
Overspeed Overspeed shuts down the unit immediately when
governed frequency on 50/60 Hz models exceeds
60/70 Hz. Note: The controller circuit board DIP
switches allow 50 Hz (60 Hz shutdown) or 60 Hz
(70 Hz shutdown) selection.
Overvoltage, Overvoltage shuts down the unit and lights the
if equipped auxiliary lamp when voltage is at least 15% over
the nominal voltage for longer than 2 seconds.
Note: Overvoltage can damage sensitive
equipment in less than 1 second. Provide
separate overvoltage protection for online
equipment requiring faster shutdowns.
Figure 2-2 Fault Shutdowns
4. Start the generator set by moving the generator set
master switch to the OFF/RESET position and then
to the RUN position. If equipped, the audiovisual
annunciator alarm horn sounds and lamp goes out.
5. Verify that the cause of the shutdown was
corrected by test operating the generator set.
6. Reconnect the generator set to the load by using
the line circuit breaker or the automatic transfer
switch.
Note: Place the generator set master switch in the
AUTO position before silencing the alarm
horn.
7. Move the generator set master switch to the AUTO
position for startup by remote transfer switch or
remote start/stop switch. If equipped, move the
audiovisual annunciator alarm switch to NORMAL.
8. Move the controller alarm horn switch to the
NORMAL position.
Section 2 Operation 19