Sequence Of Operation; Starting Sequence, Master Switch Moved To Run; Starting Sequence, Remote Start; Running Sequence - Kohler 8.5RES Service Manual

4.3 Sequence of Operation

The following sections describe the controller sequence
of operation during generator start, run, stop, and fault
shutdown modes. Use this as a starting point for
controller and relay board fault identification. Refer to
the wiring diagrams in Section 7 to assist in the
troubleshooting procedure.
4.3.1 Starting Sequence, Master Switch
Moved to RUN
When the master switch is moved to the RUN position,
there is a delay of about 2 seconds before the controller
attempts to start the engine. The electronic governor
moves to its start position. The run relay energizes and
the run LED (1) turns on. The crank and flash relays
energize and the corresponding LEDs (2 and 3) turn on
0.5 seconds later. The controller display indicates the
crank cycle 1 code, CC 1.
The controller attempts to start the generator set three
times (three crank cycles, 15 seconds crank and 15
seconds off). If the generator set does not start in three
attempts, the system shuts down on an overcrank fault.
When the engine comes up to speed, the low oil
pressure switch contacts open.
Note: The controller circuit board prevents fault
shutdowns during startup until the crank
disconnect relay energizes.
The cyclic cranking cycle is programmed into the
controller's application code and is not adjustable in the
field.
The factory sets the cranking cycle for three cycles of
15 seconds on time and 15 seconds off time. If the
TP-6196 5/04
cranking cycle seems shorter than the factory setting,
check the engine starting battery.
4.3.2

Starting Sequence, Remote Start

When the master switch is set to the AUTO position, the
generator set starts when the remote start switch or
transfer switch engine start contacts close.
The start sequence proceeds as described in
Section 4.3.1, Starting Sequence, Master Switch
Moved to RUN.
4.3.3

Running Sequence

When the engine speed reaches 750 rpm, the crank
relay deenergizes and the crank LED (3) turns off.
When the output voltage on leads 11 and 44 reaches
about 30 VAC, the flash relay deenergizes and the flash
LED (2) turns off.
4.3.4 Stopping Sequence, Master
Switch Moved to OFF/RESET
Place the generator master switch in the OFF/RESET
position. The run relay deenergizes and the run LED (1)
turns off. The generator set stops.
4.3.5

Stopping Sequence, Remote Stop

When the remote start contacts open, the run relay
deenergizes and the run LED (1) turns off, but the
controller does not power down. The controller remains
powered and displays the engine runtime hours.
Note: Disconnecting the P7 jumper inside the controller
will allow the controller to power down 48 hours
after generator set shutdown. See Section 4.6,
Continuous Power Mode.
Section 4 Controller 23