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Recent RDC2 Controller Updates
Kohler Co. has become aware of some issues on the
RDC2 controller. These issues and suggested solutions
are listed below. Not all products will experience these
issues and this is not a requirement to perform service
on normally operating equipment.
Note: The current version software must be
installed on any controller whenever possible
prior to replacing the controller. Kohler Co.
reserves the right to deny claims for
controller replacement if it is determined that
the current version software is not loaded on
the controller.
Cooling Fans Cycle at Low Temperatures
(48RCL only)
Kohler Co. has seen cases of the radiator cooling fans
running during exercise even though the engine
temperature is low.
introduced in March 2012 to correct this issue.
L1-L2 Low Voltage Shutdown during Exercise
Kohler Co. has seen instances of the generator shutting
down with an L1-L2 low voltage fault during exercise. A
software update to resolve this condition was released
in June, 2012. Update the controller with software
version 4.07 or higher.
Display Errors
Some RDC2 controllers used on the 14RESA/L,
20RESA/L,
and
48RCL
manufactured between January 2012 and August 2012
have shown errors on the controller display.
In some cases, the controller display may be blank or
may display erroneous characters.
occurs when the battery is connected either at startup,
during service, or even when the controller firmware is
being updated. High ambient temperatures seem to
increase the likelihood of this condition occurring.
Kohler Co. has released a software update to fix these
errors. Install controller software version 4.09 or higher
if the controller demonstrates display errors. Generator
SB-722
1/13
Software version 4.05 was
model
generator
This condition
sets with serial numbers SGM322H5R and higher have
been updated with this change.
It is important to note:
D
The controller will function correctly in the event of a
power outage even if the display is blank or displaying
unusual characters.
D
In most cases, even if the screen is blank or has
erroneous characters, updating the software to
version 4.09 or higher will restore the display to
correct operation.
Lack of Communication with Generator RBUS
Accessories
Kohler Co. has seen instances of lack of communication
between the generator set and the Model RXT transfer
switch or optional generator set accessories on the
RBUS communication link. If this issue is present, the
Model RXT Transfer Switch, Load Control Module
(LCM), and Programmable Interface Module (PIM) will
not work. For installations with the Model RDT transfer
switch, the transfer switch operation is not affected.
Investigation has found that an internal failure of a
component
in
communication problem. The condition can be checked
by verifying the presence of 12 VDC on the RBUS line
terminals PWR and COM. Check connections and then
replace the controller assembly if 12 VDC is not present
on these terminals.
Changes to reduce the likelihood of this failure were
implemented on controllers in August, 2012. Generator
sets
sets with serial numbers SGM322JNG and higher have
been manufactured with this improvement.
RXT Terminal Block Labels
On RXT transfer switches shipped from January 2012 to
March 2012, the labels on the T-shaped green terminal
block (GM84150) for RBUS connections were reversed.
The manuals and controller board labels were correct.
Reversing the connections will not damage the
equipment, but the transfer switch and other
accessories will not operate.
according to the labels on the controller board for correct
operation.
the
controller
can
Connect the wiring
cause
this
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