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

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



Recommended Installation guide - Com-Trol to Danfoss USCO.EI.RF0.A1.22.CT / 521U0185 ©Danfoss 04-11

www.danfoss.us

ADAP-KOOL® Refrigeration Control Systems is a trademark of Danfoss A/S, www.danfoss.com

Danfoss can accept no responsibility for possible errors in catalogs, brochures, or other printed material. Danfoss reserves the right to alter its products without notice. This also applies to products already on order provided that alterations

can be made without subsequent changes being necessary in specications already agreed. All trademarks in this material are property of the respective companies. Danfoss and the Danfoss logotype are trademarks of Danfoss A/S. All

rights reserved.

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