Danfoss AK-SC255 User manual

DANFOSS NORTH AMERICA
Recommended Installation guide
AK-SC255 Com-Trol local bus support
V1.0
MAKING MODERN LIVING POSSIBLE

Table of contents
Page 3 Introduction and document scope
Page 4 1.0 Intended application (Hardware / Software)
Page 5 2.0 Programming AK-SC255 Database
Page 6 3.0 Appendix

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 ocial 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, ecient 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 conguration.
Figure 1 - Danfoss AK-SC255 used as Com-Trol 4k / 4k2e replacement (local bus)
Ethernet host network
EOL
EOL 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

1.0 Intended application (Hardware / Software)
The following important points dene the intended application scope for a Com-Trol (local bus) retro-t installation. Please
read these fundamental requirements before continuing.
• One Com-Trol 4K/4K2e should be replaced with one Danfoss AK-SC255 unit
• The Danfoss AK-SC255 RS-485 (Modbus) port is used for communication to the Com-Trol I/O boards (gure 1). Host
communication to other AK -SC255 and/or AK-SC255 Loggers must be done via the Ethernet port.
• Only one local bus loop can be connected to the AK-SC255 (gure 1) - No star wiring congurations allowed
• Valid local bus termination and wiring rules must be applied and maintained (see gure 3 below)
• Existing system capacity for number of Com-Trol I/O boards (dened by Com-Trol documentation) must be maintained
• AK-SC255 software version R2.151 and above must be used in order to provide Com-Trol support
• The AK-SC255 being used in the application must have a valid Com-Trol license installed. If a license is required contact
Danfoss Customer service on 410-931-8714 with the AK-SC255 MAC address
Power Connection
(100 - 240 V a.c.)
LonWorks© Port(s)
RS485 Modbus - Used for COM-Trol local bus
Alarm Relay
External Modem
Port
Ethernet
Fuse (1 Amp) 30 V d.c.
Direct
Connect
Port
Door latch
CPU Card
Battery
Battery Jumper
circuit
Address
Switch
Figure 2- AK-SC255 Internal port and connection layout
Figure 3- Com-Trol recommended wiring standard
(extract from Com-Trol MCS-4xxx and 4K2e Install manual (F-27262-4)

2.0 Programming AK-SC255 Database
One of the central tasks involved in retro-tting the Com-Trol front end unit is the conguration of the AK-SC255 database that
allows the Danfoss controller to fully replace the Com-Trol unit(s). Review the following section for guidance in creating the
AK-SC255 database, which replaces the Com-Trol 4k2/4K2e systems.
Using the Com-trol EZCom software, pull back and save the existing Com-Trol 4K or 4K2e controllers to be converted to
the Danfoss AK-SC255
The Com-Trol les can be viewed with the Com-Trol EzSet software utility
Using the Danfoss AKA65 software service tool, create a blank database by using the simulate function. Ensure the correct
version of simulated database is created to avoid compatibility issues on site (i.e. use the same version for the database pro-
gramming that will be installed in the physical AK-SC255 unit)
3a Start conguration of the AK-SC255 database by setting the Legacy I/O type to COMTL (found in the Store Info /
Preferences) Figure 4
3b Congure the Modbus channel under the Communications / I/O Network / Rescan Channels page. If Danfoss AK I/O
boards are also to be used, ensure the channel ‘LonWorks’ is checked also. Figure 5
3c When assigning Com-Trol board points, rst press F4 to convert the board-point type to the Com-Trol format. Figure 6
Relay conguration (table 1)
Sensor osets used in Com-Trol controllers should be transferred to the AKA65 database
Com-Trol format (EzSet) Danfoss format (AKA65)
Relay Normal N-Closed
Invert N-Open
Digital Input Normal Open
Invert Closed
Table 1
1
2
3
4
5
Preferences screen
(set Legacy I/O to COMTROL)
Sensor Congure screen
(select from drop down type list)
Rescan screen
(check Modbus)
Figure 4 Figure 5 Figure 6
new Com-Trol
sensor selection

3.0 Appendix
Site Survey considerations
Location of Com-Trol 4k2 or 4k2e - Note whether box mount or panel-mount.
Modem location (6k)
Danfoss Logger requirements?
Location of CWeb or 5K (if applicable)
Leak detector location and type
Note any HGM 300 units and number of zones
Document Com-Trol hardware copyright dates. Dates prior to 1998 will cause compatibility issues (see gure 7)
Determine optimum Ethernet switch location and Cat5 cable length
Danfoss highly recommends that all power, communications, grounding connections and termination resistors
pertaining to the Com-Trol I/O boards are reviewed before conversion to the Danfoss AK 255.
Note any global bus devices that exist and considerations for each (Energy meters, lighting panels, etc.)
Figure 7 - example of Com-Trol I/O board with copyright date of 1994 - this is not compliant or suitable for a Danfoss retro-t
operation. Seek to have older boards (pre 1998) to be either replaced with Danfoss I/O or newer Com-Trol I/O
NOTES
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Recommended Installation guide - Com-Trol to Danfoss USCO.EI.RF0.A1.22.CT / 521U0185 ©Danfoss 04-11
www.danfoss.us
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