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

5.3 Sequence of Operation

The following sections describe the controller sequence
of operation during generator start, run, stop, and fault
shutdown modes.
controller and relay board fault identification. Refer to
the wiring diagrams in Section 8 to assist in the
troubleshooting procedure.
5.3.1 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 fuel (run) relay energizes
and the corresponding LED on the control board turns
on. (See Section 4.8 for relay information.) Then the
crank and flash relays energize and the corresponding
LEDs turn on. 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
cranking cycle seems shorter than the factory setting,
check the engine starting battery.
5.3.2

Starting Sequence, Remote Start

The generator set master switch must be in the AUTO
position for remote start/stop by a remote switch or
automatic transfer switch.
The remote start contact closes across engine start
leads 3 and 4 to start the generator set. The start
sequence proceeds as described in Section 4.3.1,

Starting Sequence, Master Switch Moved to RUN.

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5.3.3

Running Sequence

When the engine speed reaches 750 rpm, the crank
relay deenergizes and the crank LED turns off. When
the output voltage on leads 11 and 44 reaches about
30 VAC, the flash relay deenergizes and the flash LED
turns off.
5.3.4 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.
5.3.5

Stopping Sequence, Remote Stop

The generator set master switch must be in the AUTO
position for remote start/stop by a remote switch or
automatic transfer switch.
When the remote start contact across leads 3 and 4
opens, the run relay deenergizes and the run LED (1)
turns off. The generator set stops.
5.3.6

Standby Mode

When the generator set master switch is in the AUTO
position, the controller is in standby mode. Engine
runtime hours are shown on the display. A remote start
signal (contact closure) will start and run the generator
set.
If there is no start signal for 48 hours, the controller goes
into sleep mode.
5.3.7

Sleep Mode

When the generator set master switch is in the AUTO
position, the controller powers down automatically if
there is no start signal for 48 hours after shutdown. The
controller display is dark and battery draw is minimized.
A remote start signal (from a transfer switch or a remote
start/stop switch connected to controller leads 3 and 4)
reactivates the controller. Moving the generator set
master switch to the RUN position also activates the
controller.
TP-6196 10/09