Danfoss AK-CC 550 Manual page 11

Data communication
The controller has fixed built-in MODBUS data communication.
If there is a requirement for a different form of data
communication, a Lon RS 485 module can be inserted in the
controller.
The connection must then be to terminal RS 485.
(To use a Lon RS 485 module and gateway type AKA 245 the
module must be Version 6.20 or higher.)
Display
The controller has one plug for a display. Here display type EKA
163B or EKA 164B (max. length 15m) can be connected.
EKA 163B is a display for readings.
EKA 164B is both for readings and operation.
The connection between display and controller may be with a
cable which has a plug at both ends.
If the distance between display and controller is greater than 15
m, the connection must take another form.
An extra module must also be mounted in the controller if data
communication is used.
The built-in MODBUS data communication is used so that the
display connection and the data communication to the other
controllers must take place via a module. The module can be:
Lon RS 485 or MODBUS.
When a display is to be connected to the built-in MODBUS, the
display can advantageously be changed to one of the same type,
but with Index A (version with screw terminals).
If connection of two displays is required, one must be connected
to the plug (max. 15 m) and the other must then be connected to
the fixed data communication.
Important
All connections to the data communication MODBUS and RS 485
must comply with the requirements for data communication
cables. See literature: RC8AC.
Override
The controller contains a number of functions which can be used together with the override function in the master gateway/system
manager.
Function via data communication
Start of defrosting
Coordinated defrost
Prevent defrost start
Day/Night schedule
Light control
Forced closing
Forced cooling
Railheat link to dew point
P0 optimization
Adaptive defrost
AK-CC 550
Function in gateway/system manager
Defrost control / Time schedule / Defrost group
Defrost control / Defrost group
Day/Night control / Time schedule / Light zone
Day/Night control / Time schedule
Forced Close / Injection ON / AKC ON
/ Enhanced railheat
P0 Optimization
/ Adaptive defrost. System manager only
Manual RS8EN502 © Danfoss 02-2010
Used parameters in AK-CC 550
--- Def start
--- HoldAfterDef / - - - DefrostState
--- Disable Def
--- Night setback
O39 light Remote
--- Forced cl.
--- Forced cool
--- Dew point
The controller supports P0 optimization
- - - Tc TempMean
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