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Introduction
This document describes the main points concerning a Com-Trol to Danfoss AK-SC255 conversion process. Since January 2011
the Schneider Electric© group has formally granted Danfoss Inc the intellectual rights to it's Com-Trol control products.
Danfoss Inc is pleased to be the only official controls supplier which is recognized as the recommended replacement solution
for your Com-Trol installation.
Document scope
The scope of this document is intended to provide guidance when replacing Com-Trol 4k or 4K2e controllers for a Danfoss
AK-SC255 on a existing Com-Trol local bus network. The Danfoss AK-SC255 is a comprehensive front end controller, capable of
Refrigeration, Lighting and HVAC control and is used globally throughout the Food Retail market. Once the Danfoss AK-SC255
has been suitably installed it will provide many years of trouble free, efficient operation, in parallel with the existing Com-Trol
local bus I/O boards.
This installation guide does not replace any existing documentation provided by Com-Trol, when working with Com-Trol
equipment please refer to available Com-Trol documentation.
Prerequisite knowledge and experience
It is expected that the service technician is already experienced and has a deep knowledge of the Danfoss AK-SC255 controller.
Training is available from Danfoss upon request. In addition, knowledge about the actual site installation would be advanta-
geous as many control changes may have occurred from the original configuration.
Figure 1 - Danfoss AK-SC255 used as Com-Trol 4k / 4k2e replacement (local bus)
EOL
EOL
Ethernet host network
EOL
EOL
EOL
EOL
Ensure End Of Line terminators (EOL) (120 Ohm) are
used both in the AK-SC255 and end of Com-Trol I/O
run. Daisy chain network topology only