User Guide | Optyma™ control AK-RC 113 three phase
© Danfoss | DCS (vt) | 2020.03 BC317523579312en-000101 | 15
6.1 Net configuration with
modbus-RTU protocol
6.0 Modbus connection
For RS-485 connections with Modbus-RTU protocol follow the scheme below.
AK-RC 113
7 8
7.1 Diagnostics by means of
alarm codes
7.0 Diagnostics
In the event of any anomalies of the AK-RC 113, it notifies the operator by means of the alarm codes
displayed on the display and an audible signal emitted by a buzzer inside the control panel. The EL
and EH temperature alarms remain visible even after their return (alarm icon lights on) until their
acknowledgment (by pressing the key). If an alarm condition occurs, one of the following messages
will be displayed on the display:
Alarm code Possible cause Solution
E0 Cold room temperature sensor not working properly • Check that cold room temperature
sensor is working properly
• If the problem persists, replace the
sensor
E1 Defrost sensor not working properly
(In this case defrosts will last time d3)
• Check that defrost sensor is
working properly
• If the problems persists, replace the
sensor
E2 Eeprom alarm
An EEPROM memory alarm has been detected
(All outputs except the alarm one are deactivated)
• Switch unit off and back on
E8 Man in cold room alarm • Reset the alarm input inside the
cold room
Ec Compressor protection tripped
(e.g. thermal protection or max pressure switch)
(All outputs except the alarm one – where applicable –
are deactivated)
• Check that compressor is working
properly
• Check compressor absorption
• If the problem persists, contact the
technical assistance service
Ed Open door Alarm.
When the door is opened and after tdo time, it’s setted
back the normal functioning giving door open alarm
(Ed).
• Check door switch status
• Check door switch connections
• If the problem persists contact the
technical assistance service
E9 Cell light alarm.
The light of the cell has been on for a time greater than
tdo.
• Turn off the light
EH Maximum temperature alarm.
The temperature inside the cold room has exceeded
the max. temperature alarm setting (see variables A2,
user programming level)
• Check that the compressor is
working properly.
• Sensor not reading temperature
properly or compressor start/stop
control not working.
EL Minimum temperature alarm.
The temperature inside the cold room has exceeded
the min. temperature alarm setting (see variables A1,
user programming level).
• Check that the compressor is
working properly.
• Sensor not reading temperature
properly or compressor start/stop
control not working.
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