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Instructions RI8LN802 © Danfoss 2/2012
AK-CC 550
Fault message
In an error situation the LED’s on the front will flash and the alarm relay will be
activated. If you push the top button in this situation you can see the alarm
report in the display.
There are two kinds of error reports - it can either be an alarm occurring dur-
ing the daily operation, or there may be a defect in the installation.
A-alarms will not become visible until the set time delay has expired.
E-alarms, on the other hand, will become visible the moment the error occurs.
(An A alarm will not be visible as long as there is an active E alarm).
Here are the messages that may appear:
Code / Alarm text via
data communication
Description
Alarm
relay
groups
(P41)
A1/--- High t.alarm
High temperature alarm
1
A2/--- Low t. alarm
Low temperature alarm
2
A4/--- Door alarm
Door alarm
8
A5/--- Max hold time
The ”o16” function is activated during a
coordinated defrost
16
A10/--- Inject prob.
Control problem
64
A11/--- No Rfg. sel.
No refrigerant selected
64
A13/--- High temp S6
Temperature alarm. High S6
1
A14/--- Low temp S6
Temperature alarm. Low S6
2
A15/--- DI1 alarm
DI1 alarm
8
A16/--- DI2 alarm
DI2 alarm
8
A45/--- Standby mode
Standby position (stopped refrigera-
tion via r12 or DI input)
-
A59/--- Case clean
Case cleaning. Signal from DI input
-
A74/--- AD fault
Error in the adaptive defrost function
16
A75/--- AD Iced
Evaporator is iced up. Reduction of
air flow
16
A76/--- AD not defr.
Defrost of evaporator is not
satisfactory
16
E1/--- Ctrl. error
Faults in the controller
32
E6/--- RTC error
Check clock
32
E20/--- Pe error
Error on pressure transmitter Pe
64
E23/--- S1 error
Error on S1 sensor
4
E24/--- S2 error
Error on S2 sensor
4
E25/--- S3 error
Error on S3 sensor
4
E26/--- S4 error
Error on S4 sensor
4
E27/--- S5 error
Error on S5 sensor
4
E28/--- S6 error
Error on S6 sensor
4
E37/--- S5 error B
Error on S5B sensor
4
---/--- Max Def.Time
Defrost stopped based on time instead
of, as wanted, on temperature
16
Settings from
System manager
Settings from
AKM (AKM destination)
Log
Alarm relay
Send via
Network
Non
High
Low-High
High
1
X
X
X
X
Middle
2
X
X
X
Low
3
X
X
X
Log only
X
Disabled
Additional information:
Manual RS8EN
Data communication
The importance of individual alarms can be defined with a setting. The setting
must be carried out in the group "Alarm destinations"
*) Emergency cooling will take effect when there is lack of signal from a defined
S3 or S4 sensor. The regulation will continue with a registered average cutin
frequency. There are two registered values – one for day operation and one for
night operation.
Operating status
(Measurement)
The controller goes through some regulating situa-
tions where it is just waiting for the next point of the
regulation. To make these “why is nothing happening”
situations visible, you can see an operating status on
the display. Push briefly (1s) the upper button. If there is
a status code, it will be shown on the display. The indi-
vidual status codes have the following meanings:
Ctrl. state:
(Shown in all
menu displays)
Normal regulation
S0
0
Waiting for end of the coordinated defrost
S1
1
When the compressor is operating it must run for at least
x minutes.
S2
2
When the compressor is stopped, it must remain stopped
for at least x minutes.
S3
3
The evaporator drips off and waits for the time to run out S4
4
Refrigeration stopped by main switch. Either with r12 or
a DI-input
S10
10
Refrigeration stopped by thermostat
S11
11
Defrost sequence. Defrost in progress
S14
14
Defrost sequence. Fan delay — water attaches to the
evaporator
S15
15
Refrigeration stopped due to open ON input or stopped
regulation
S16
16
Door is open. DI input is open
S17
17
Melt function in progress. Refrigeration is interrupted
S18
18
Modulating thermostat control
S19
19
Emergency cooling due to sensor error
S20
20
Regulation problem in the injections function
S21
21
Start-up phase 2. Evaporator being charged
S22
22
Adaptive control
S23
23
Start-up phase 1. Signal reliability from sensors is
controlled
S24
24
Manual control of outputs
S25
25
No refrigerant selected
S26
26
Case cleaning
S29
29
Forced cooling
S30
30
Delay on outputs during start-up
S32
32
Heat function r36 is active
S33
33
Other displays:
The defrost temperature cannot be displayed. There is
stop based on time
non
Defrost in progress / First cooling after defrost
-d-
Password required. Set password
PS
Regulation is stopped via main switch
OFF
DE-DB