13IntroductionTP-6694 7/18
Introduction
This manual provides operation instructions for 10 kW
and larger generator sets equipped with the following
controllers:
D APM402 generator set controller
D Decision-Makerr 3000 generator set controller
Note: In 2018, Kohler adopted a global controller
naming convention. To support this, the name of
the Decision-Makerr 3000 controller has
transitioned to APM402. The APM402 has the
same form, fit and function as the
Decision-Makerr 3000 and supports the same
accessories.
Wiring diagram manuals are available separately. Refer
to the engine operation manual for generator set engine
scheduled maintenance information.
Information in this publication represents data available
at the time of print. Kohler Co. reserves the right to
change this publication and the products represented
without notice and without any obligation or liability
whatsoever.
Read this manual and carefully follow all procedures
and safety precautions to ensure proper equipment
operation and to avoid bodily injury. Read and follow the
Safety Precautions and Instructions section at the
beginning of this manual. Keep this manual with the
equipment for future reference.
The equipment service requirements are very important
to safe and efficient operation. Inspect the parts often
and perform required service at the prescribed intervals.
Maintenance work must be performed by appropriately
skilled and suitably trained maintenance personnel
familiar with generator set operation and service.
Abbreviations
This publication makes use of numerous abbreviations.
Typically, the word(s) are spelled out along with the
abbreviation in parentheses when shown for the first
time in a section. Appendix A, Abbreviations, also
includes many abbreviation definitions.
SiteTecht Software
Several instances in this manual refer to SiteTecht
software, which can be used for programming the
APM402 or Decision-Makerr 3000 controller.
SiteTecht software is required for updating the
controller application code (firmware), loading
personality profiles, and saving or loading controller
configuration files. Contact your local distributor/dealer
for assistance.
Note: The APM402 controller uses different firmware
than the Decision-Makerr 3000 controller. Do
not attempt to load Decision-Makerr 3000
firmware on an APM402 controller, or vice-versa.
To determine the generator set controller software
version, go to the Overview menu.
List of Related Materials
Separate literature contains communication and
software information not provided in this manual.
Figure 1 lists the available literature part numbers.
Literature Description Literature Part No.
APM402 Controller Spec Sheet
G6-161
Decision-Makerr 3000 Controller Spec
Sheet
G6-100
Generator Set/Controller
Wiring Diagram Manual
Multiple Part Numbers
Contact your
Distributor/Dealer
Modbusr Communications Protocol
Operation Manual
TP-6113
SiteTecht Software Operation Manual
TP-6701
Remote Serial Annunciator (RSA III) TT-1625
Remote Serial Annunciator (RSA II) TT-1485
Converters, Connections, and Controller
Setup for Network Communication
TT-1405
Figure 1 Related Literature
Several engine manufacturers provide engines with
electronic controls. These electronic controls indicate
engine fault codes in addition to the generator set
controller. The engine operation and service literature
provide information for identifying engine fault codes.
For the latest literature part numbers, see the respective
Parts Catalog.
Modbusr is a registered trademark of Schneider Electric.
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