Kohler 12RESL, Operation Manual, Page: 16 / 48

TP-6517 1/11 16 Section 2 Operation
2.2.2 LED Display
The LED display indicates generator set status as
shown in Figure 2-2. When the generator set is running,
engine runtime hours are shown unless a fault is active.
The LED display is activated by a start or RUN
command as follows:
D
Move the master switch to RUN.
D
With the master switch in AUTO, send a remote start
command (close the remote start contact across
leads 3 and 4).
When the generator set is started, the version number of
the controller application code is displayed during the
first 2 seconds of the crank cycle.
When the master switch is in AUTO, the display may
turn off 48 hours after generator set shutdown. See
Section 2.3.2.
2.3 Controller Power
The DC-RET is powered by the generator set engine
starting battery.
Note: The generator sets are equipped with factory-
installed battery chargers to prevent battery
discharge.
The battery charger must be
connected to a 120 VAC supply (utility power).
2.3.1 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.
2.3.2 Sleep Mode
Note: Sleep mode is disabled on controllers with
application code version 1.13 or higher. Check
the code version during the crank cycle; see
Figure 2-2.
On controllers with the sleep mode enabled: When the
generator set master switch is in the AUTO position, the
controller powers down if there is no start signal for 48
hours after shutdown. In sleep mode, 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.
2.4 Generator Set Operation
2.4.1 Starting Generator Set
Local Starting
Move the generator set master switch to the RUN
position to immediately start the generator set.
Auto (Automatic) Starting
Move the generator set master switch to the AUTO
position to allow startup by an automatic transfer switch
(ATS) or remote start/stop switch, if equipped. Close a
contact across engine start leads 3 and 4 to signal the
controller to start the generator set.
Crank Cycle
The controller attempts to start the generator set three
times (three crank cycles, 15 seconds crank and
15 seconds off). See Figure 2-2 for display information
during the crank cycle. If the generator set does not start
in three attempts, the system shuts down on an
overcrank fault. See Section 2.6.
Control or Indicator Item Description
Generator set master
switch Three-position
switch RUN-OFF/RESET-AUTO switch functions as the generator set operation and
controller reset switch.
LED display Runtime hours Displays total generator set runtime hours while the generator set is running and
when no other codes are displayed.
Crank indication Displays CC_1, CC_2, or CC_3 to indicate the first, second, or third attempt to
start the engine. The last digit flashes during the crank cycle rest periods.
Application
code version
number The application code version number (v#.##) is displayed during the first
2 seconds of the crank cycle.
Fault codes Flashes a 2- or 3-letter fault code to indicate various fault conditions. See
Section 2.6.
Figure 2-2 DC-RET Controls and Indicators