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User Guide | Danfoss troubleshooting guide for supermarket electronics

© Danfoss | Climate Solutions | 2022.02

BC337731384771en-000301 | 6

AKV Not Opening

1.  Is proper voltage at terminals 5&6 (should match coil voltage spec)?
2.  Is case controller calling for valve to be open? (parameter u23 > 0%)

a.  If yes

i.  If voltage on 5 but not 6, bad relay
ii.  If no voltage on 5, check voltage source 
iii.  If voltage to 5&6 ok, could be bad coil or issue with valve blockage

b.  If no 

i.  Is superheat reading correct? (see ‘incorrect superheat’ below to troubleshoot)
ii.  Is saturated suction temp above MOP temp setting (parameter u26 vs. n11)
iii.  Is main switch on (r12)?
iv.  Verify ‘close EEV during rack shutdown’ setting at rack controller is not exceeded
v.  Verify shutdown schedule in rack controller not enabled

Incorrect Superheat

1.  Is coil outlet sensor (s2) accurate? 

a.  Check parameter u20. If reading inaccurate, sensor should be replaced as this can lead to 

floodback.

2.  Is pressure transducer accurate?

a.  Check parameter o20 (-15psi)
b.  Check parameter o21 (174psi-HFC, 855psi-CO2)

Pe Error (E20)

1.  Verify transducer wiring 

a.  If using 060G1034 connector, terminals 30, 31, 32 wired black, blue, brown.
b.  Measure voltage across termainls 30, 31. Should be 5Vdc
c.  Measure voltage across terminals 31, 32. Should be in range of 0.5-4.5Vdc.
d.  Verify transducer type. Label of transducer should say AKS32R (HFC) or AKS 2050 (CO2)

S3 Error (E25)

1.  If no return air (s3) sensor exists, verify the following parameters:

a.  R15 = 100%
b.  A36 = 100%
c.  O17 = 100%
d.  R61 = 100%

2.  If return air sensor does exist, verify ohm reading of sensor, and confirm wired to terminals 37, 38.

AK-CC 550A Case Controllers Offline

1.  Complete rescan
2.  Verify if loop is Modbus or Lon

a.  If LON, is comm card installed?
b.  If Modbus, verify polarity on all units is consistent

3.  Verify ‘Channel Lonworks’ or ‘Channel Modbus’ enabled appropriately on Network Nodes screen

a.  If not, update and rescan afterwards

4.  Verify term resistor switch position at AK-SM 800 is correct

a.  If 1 loop from plug, switch = ‘On’ position
b.  If 2 loops from plug, switch = ‘Off’ position

5.  Verify EOL resistor in place at end of loop(s)

a.  120 Ω resistor

6.  Verify # of devices on system manager is less than 120.
7.  Verify total loop distance less than 4000 ft.

a.  If longer, repeater must be added.

8.  Verify no Duplicates on System Manager

a.  Found under Duplicates tab in Network Nodes
b.  If duplicates exist, identify controllers sharing address and correct

9.  Verify wire type ok

a.  Should be EIA485 rated cable
b.  Refer to Danfoss comm guidelines document as needed

10. Isolate loop in sections, rescan
a.  Identifies where comm problem may be introduced

3. AK-CC 550A

Содержание AK-SM 800A

Страница 1: ...User Guide Danfoss troubleshooting guide for supermarket electronics www danfoss com...

Страница 2: ...C 550A to AK SM 800 7 Dual Temp Setup 7 4 AK CC 750 7 Replacing AK CC 750 7 5 AK XM Modules 7 AKS Temp Sensor not Reading on IO Module 7 AK XM 103A module not coming online 7 Relay will not respond to...

Страница 3: ...should be 24 V AC DC 2 Verify Channel Lonworks enabled on Network Nodes screen a If not enable and rescan afterwards 3 Verify term resistor switch position at AK SM 800 is correct a If 1 loop from pl...

Страница 4: ...4 Replace AK SM 800 IO Offline 1 Verify Power to modules Complete rescan a Power supply to comm modules should be 24 V AC DC 2 Verify Channel Lonworks enabled on Network Nodes screen a If not enable...

Страница 5: ...ue address 3 Verify connection from AK SM 800 to switch and switch to network a Could be the issue with the cable b Power cycle network switch router or cell modem 4 Reset AK SM 800 a Make sure to res...

Страница 6: ...dc c Measure voltage across terminals 31 32 Should be in range of 0 5 4 5Vdc d Verify transducer type Label of transducer should say AKS32R HFC or AKS 2050 CO2 S3 Error E25 1 If no return air s3 senso...

Страница 7: ...e or loose connection between module and probe b If reading closed likely a short in cable between module and probe c If reading expected resistance compare to temp ohm chart for PT1000 move sensor to...

Страница 8: ...ion IO Offline 1 Verify Power to modules Complete rescan 2 Verify Channel Lonworks enabled on Network Nodes screen a If not update and rescan afterwards 3 Verify EOL resistor in place at end of loop a...

Страница 9: ...oftware 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 Win...

Страница 10: ...Danfoss Climate Solutions 2022 02 BC337731384771en 000301 10...

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