Kohler COM7.5, Service Manual

Page: 43 / 64

TP-6120 5/02 33 Section 5 Controller Operation and Test
5.1.6 Fault Shutdowns
The generator set shuts down automatically under the
fault conditions listed in Figure 5-3 and cannot be
restarted until the controls are reset. The LED on the
control board illuminates to indicate a fault.
See
Figure 5-1.
Identify and correct the cause of the fault, then reset the
controller by placing either the remote control switch or
the generator set master switch in the STOP position.
Note: The high engine temperature fault automatically
resets and the
engine restarts when the
generator set cools.
Fault Description
High engine
temperature Shuts down 5 seconds after the
fault. When the engine cools, the
fault clears and the controller
resets automatically.
Note: The generator set engine
restarts after the engine
cools.
The high engine temperature
shutdown does not function during
the first 30 seconds after startup.
Low oil pressure Shuts down 5 seconds after the
fault. The low oil pressure
shutdown does not function during
the first 30 seconds after startup.
NOTE: The low oil pressure
shutdown does not protect against
low oil level.
Overcrank Shuts down after three starting
attempts: crank 15 sec., rest
15 sec., overcrank fault after three
attempts to start.
Overcrank shutdown also occurs
in the case of a locked rotor.
Shuts down 1 second after the
fault is detected.
Overspeed Shuts down immediately if the
engine speed exceeds 3850 RPM.
Figure 5-3 Fault Shutdowns
5.2 Fault Shutdown Tests
Verify operation of the controller overspeed, overcrank,
low coolant level, low oil pressure, and high engine
temperature shutdowns by performing the following
tests with the generator set running. Observe the LED
on the controller circuit board during the tests. Refer to
the service views in Section 1.4 for component
locations.
Follow the enclosure manufacturer’s instructions to
open or remove the enclosure to gain access to the
generator set components in the following tests.
Check the continuity of the wiring harness leads before
replacing the control board.
Refer to the wiring
diagrams in Section 7 for the lead codes and connecting
terminals.
If these tests are inconclusive, test the individual
shutdown
circuit components as described in
Section 5.3.
Hazardous voltage.
Can cause severe injury or death.
Only authorized personnel should
open the enclosure.
(600 volts and under)
WARNING
Hazardous voltage.
Can cause severe injury or death.
Operate the generator set only when
all guards and electrical enclosures
are in place.
Moving rotor.
WARNING
Servicing the generator set when it is operating. Exposed
moving parts can cause severe injury or death.
Keep
hands, feet, hair, clothing, and test leads away from the belts
and pulleys when the generator set is running.
Replace
guards, screens, and covers before operating the generator
set.
Short circuits. Hazardous voltage/current can cause
severe injury or death. Short circuits can cause bodily injury
and/or equipment damage . Do not contact electrical
connections with tools or jewelry while making adjustments or
repairs. Remove all jewelry before servicing the equipment.