Danfoss AK-CC 550A Mode d’emploi

Troubleshooting Guidelines

AK-CC 550A

Service Guide

ADAP-KOOL® Refrigeration Control System

Service Guide |Troubleshooting Guidelines, AK-CC 550A

2 | AX278927426184en-000101

The following troubleshooting guidelines detail the process of

verifying proper setup of an AK-CC 550A when encountering

communication/oﬄine issues with an AK-SM 800 series controller.

System Manager Programming

• Complete Rescan

- On Network Nodes screen, select ‘Press for complete rescan’

*Also complete rescan if any of the items below required

adjustment

• Ensure proper channel enabled on Network Nodes screen of

system manager

- ‘Channel LONWORKS’ for LON RS485 comm loop

- ‘Channel MODBUS-RS485’for Modbus comm loop

• Verify no Duplicates in System Manager

- Check under Network Nodes->Duplicates

- If duplicates exist, identify case controller with mistaken

address, and update

• Verify address has been assigned to case controller in

program

- Verify under Conﬁguration->Control->Refrigeration-

>Addresses

AK-CC 550A Hardware

• Verify part # of AK-CC 550A. This will be printed on front of

controller below display

- For 084B8030, verify 230Vac to terminals 1&2

- For 084B8036, verify 115Vac to terminals 1&2

AK-CC 550A Programming

• Ensure address is set correctly, via parameter o03.

• Ensure application is set correctly, via parameter o61.

Comm Loop Wiring

• Verify intended form of communication to be used (Modbus

or LON RS485)

- For Modbus communication:

- Ensure comm wires are landed on terminals 57&58.

- Modbus loop is polarity sensitive, ensure polarity is

consistent throughout loop

- Ensure any other Modbus devices on the loop use 38400

baud rate

- For LON RS485 communication:

- Ensure comm wires are landed on terminals 52&53

- Ensure EKA 175 comm card is installed in port below

display.

- EOL resistor

- For 1 loop from system manager, ensure 120 ohm resistor

at end of loop and switch above comm plug in ‘On’

position

- For 2 loops from system manager, ensure 120 ohm resistor

at end of each loop and switch above comm plug in ‘Oﬀ’

position

• For either comm type, max distance is 4000’. Beyond this

distance, a repeater is needed

• For either comm type, max # of case controllers is 120 per

system manager

• For either comm type, an EIA 485 rated cable should be used

Danfoss can accept no responsibility for possible errors in catalogues, brochures and other printed material. Danfoss reserves the right to alter its products without notice. This also applies to products

already on order provided that such alternations can be made without subsequential changes being necessary in specifications already agreed.

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