User Guide | Danfoss troubleshooting guide for supermarket electronics
© Danfoss | Climate Solutions | 2022.02
BC337731384771en-000301 | 9
Host Comm/ Host Count Error
1. Verify the comm and see if the controllers can see each other
a. If the router is down, the controllers cannot dial out alarms or see each other
i. Power cycle the router and the controllers (Unit #0 as last)
2. Verify host comm type (RS 485 or Ethernet)
a. If Ethernet, go to configure internet (comm
→
internet)
i. Make sure to have same master IP addresses for every controller and distinctive slave IP
addresses for each slave controllers
ii. Verify DNS and DHCP
iii. If DHCP is set to no, verify default gateway and network mask. Every controller will share the
same default gateway and network mask
b. Verify # of AK-SC255’s on network.
i. i.e. (of x); x should match the total number of AK-SC 255s in host network
3. Reset #0 (master) to force scan for slave units.
8. AKC 55
AKC 55 IO Relay Chattering
1. Older RO8 modules ‘chatter’ with AKC 55 v1.061 or higher (incl. 255)
2. Comm timing needs to be changed from 20s to 4s (backdoor change)
AKC 55 Loses Program on Power Cycle
1. Battery needs to be replaced (no alarms generate for this). Would need to solder new battery in
place of existing.
No Communication with AK2 Modules
1. AKC 55 must be version 1.013 or higher to communicate with AK2 style module
2. To enter an AK2 style board-point, use the zero key to enter a decimal point.
‘Invalid License’
1. Try right-click on desktop icon, go to Properties
→
Compatibility tab. Enable check box for ‘Run this
Program as an administrator’
2. Uninstall software, reinstall AKA65 software outside of Program Files or Program Files x86 folder.
3. Obtain generic copy of aka65.ini file, place in C:/Windows folder (replace existing).
‘Unable to locate compatible Win55’ Error
1. Each version of 255 software that exists requires a separate file on PC to view.
a. Verify location win55 should exist under Options button in AKA65. Under Directories tab, ‘Win55’
path is where file should be placed matching version of controller you are connecting to.
b. If no file exists matching version of controller, file must be downloaded from 255 support
website and placed in folder.
Unable to Fully Connect to Site Remotely
1. If seeing ‘Connection Accepted’ but connection then times out, select Edit button to review setup
for site.
a. Drop-down at bottom of setup screen should be set to ‘Ethernet’ for 255, ‘Netmodem’ for AKC55
Unable to Direct Connect to AK-SC 255 Locally
1. Ensure controller address is ‘0’
a. If not set to 0, will need to connect to 255 that is address 0 (if host network exists)
b. Otherwise, controller address will need to be changed to 0 and 255 reset
2. If using Danfoss direct connect cable, ensure you are connecting to port on side of controller,
above latch
3. If using crossover cat5 cable:
a. Ensure connection goes to Ethernet port inside of 255
b. Ensure PC settings and 255 IP settings allow for both devices to see one another. Process
documented here:
https://www.danfoss.com/enus/search/?query=AX279033702249&filter=documentationLangua
ge%3Aen_en%2CdocumentationArchived%3Afalse
9. AKC 164
10. AKA 65
Sensor Failure Status
1. If all sensors reading ok, typically an issue with KVQ valve (replace)
2. Pins 35, 36 inside KVQ actuator should be ~20k Ω @75F
3. NTC Temp: 120F = KVQ fully open, 220F = NTC fully closed
4. Valve opens to 100% in this failure mode
