Danfoss AK-CT 200A, AK-CT 201A User guide

User guide

Controller tray for refrigeration appliance controller with signal from external controller

AK-CT 200A + AK-CT 201A

ADAP-KOOL® Refrigeration control systems

Introduction

Application

The controller is a complete auxiliary relay module with great flexibility for adaptation of signals from an external controller. The controller is optimised for connection of loads on refrigeration appliances and cold rooms, as well as for controlling the light and night blind.

Advantages

•Optimised for installation by manufacturer

•Electricity-controlled and voltage controlled relay connections

•Loads requiring electricity can be connected directly

•One controller for several different refrigeration appliances

•Quick set-up with predefined settings

•Built-in data communication

Principle

There are 8 digital inputs, all of which can be defined to connect to the 8 outlet relays. The relays are controlled by an internal measurement circuit that ensures an optimum connection time on the sine curve. The optimum time allows connections to be made with loads of up to 16 A on individual relays.

The current through each relay will be measured continuously, and if it becomes higher than the set permissible value, the relay will cut out and an alarm will be issued.

Functions

-Relays controlled by an external controller, e.g.:

•Compressor and possibly compressor 2

•Defrosting with 1, 2 or 3 phases

•Rail heat

•Fans and fans in eco-operation

•Light and possibly extra lighting

•Night blind

-AK-CT 200A has an alarm relay that is activated for alarms issued as the result of the cut-out of a relay due to excess current.

Contents
Introduction........................................................................................................	2
Operation.............................................................................................................	4
Applications........................................................................................................	6
Connections........................................................................................................	9
Survey of functions........................................................................................	11

Operation...........................................................................................................	14
Menu survey.....................................................................................................	15
Data......................................................................................................................	18
Ordering.............................................................................................................	19

User Guide RS8GT502 © Danfoss 2016-10

AK-CT 201A

Applications

The controller can connect functions to different refrigeration appliances, such as:

•Standard appliances or cold rooms with one evaporator and one cooling section.

•Refrigeration appliances with two evaporators and

two cooling sections.

•Refrigeration appliances with one evaporator and two cooling sections.

The external controller determines which functions are to be engaged.

A setting will configure the inputs and outputs, so that one input is destined for a specific relay output.

Installation benefits

The controller is designed to provide a number of advantages when installed by the refrigeration appliance manufacturer, such as:

High relay load

Load connection/disconnection is controlled by a voltage measurement and a current measurement, so that the relay’s switch function can operate under optimal conditions.

The controller can then connect loads of up to 16 A, without the use of auxiliary relays.

Spring clamps

All cable connections are made using plugs with spring switches. This allows for fast and easy installation.

Parallel power point

Several of the outlets have double or triple connections points, so the use of external loop clips is not usually necessary.

Structure of the controller

The controller consists of hardware type AK-CT 200A and a software identity code AK-CT 201A.

This software identity code is delivered in a separate plug and must be placed in an RJ45 plug in the hardware. It is first necessary to mount the plug when configuring the controller.

AK-CT 201A

User Guide RS8GT502 © Danfoss 2016-10

Operation

Digital inputs

There are six digital inputs with contact function and two digital inputs with high voltage signal.

They can be used for the following functions:

•Receive signals from an external controller and then activate the associated relay.

•Receive signals from switches for the activation of light and night blind.

Light function

The function can be used for controlling the light in a refrigeration appliance or in a cold room.

The light function can be defined in two ways:

•The light is controlled by a DI input

•Two signals, both of which can be on before the light goes on. One can be a DI contact signal at the appliance (fx DI3) and the other can be a voltage signal on DI7.

Extra light (light 2)

Light 2 can also be activated by one DI input, e.g. DI4.

It can also be controlled with two signals. For two signals, the second signal must be sent with a voltage signal on DI8.

Night blind

Motorised night blind can be controlled automatically from the controller. The night blinds will follow the status of the light function. When the light is switched on, the night blinds opens and when the light is switched off, the night blinds close again. When the night blinds are closed, it is possible to open them using a pulse signal on the digital input. If this input is activated, the night blinds will open and the refrigeration appliance can be filled with new products.

If the input is activated again, the blinds close again.

If the activation is omitted, the blind will close automatically when the delay time expires. A setting is used to define whether the light is to be on or off when the night blind is up.

This pulse signal must be connected to one of the following inputs: DI5, DI7 or DI8.

DI7	DI3
Light 1	Light 2	Override of light 1
controlled by	(extra light)
DI7	controlled by
and fx DI3.	DI8 and fx DI4.

User Guide RS8GT502 © Danfoss 2016-10

AK-CT 201A

Data communication

The controller has fixed built-in MODBUS data communication. It can be connected to a Danfoss system unit, if required.

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.)

Important

All connections to the data communication MODBUS and RS 485 must comply with the requirements for data communication cables. See literature: RC8AC.

Display

The controller has two plugs 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.

During standard operation the display will read “ON”.

If one of the relays cuts out due to overcurrent, three LEDs will flash on the display. In this situation, you can access the alarm list on the display by pressing the top button.

It is possible to connect two displays. There are identical signals on both plugs.

AK-CT 201A

Applications

Here is a survey of the controller’s field of application.

The applications are all adapted for commercial refrigeration systems in the form of either refrigeration appliances or cold storage rooms.

Eight connection diagrams are shown on the following pages. We recommend using the connection diagram that comes closest to the application. This will result in the greatest degree of equalisation in the three phases.

Some functions are permanently bound to certain outputs. In this case, the connection diagram must be followed. The functions are:

• Defrosting. Here is one or more of the DO outputs used, depending whether the application is a one, two or three-phase defrosting.

• Fan stop, when the night blind is down. In this case, DO7 is disconnected.

• Fan ECO function. DO8 is engaged.

Outputs

There are 8 inputs and 8 outputs. Each output can be engaged by any input, which receives a signal from an external controller or other switch function.

Alarm output

The alarm relay will be released when the controller registers an error, e.g. when a relay is disconnected due to excess current.

Digital input

DI1 to DI6 is the on/off input that can be used, for example, for one of the following functions: activate a relay for e.g. compressor, defrosting, fan, light, cancel defrost, etc.

DI7 and DI8 are 230 V inputs that can activate similar functions. See the functions in the respective settings o84, etc.

There are limitations on DO1 and DO2. They can only be used for signals from the external controller.

Control of night blinds

Night blinds follow the status of the light function – when the light is switched on, the night blinds are up and when the light is switched off, the night blinds are down. In addition a digital input provides the option of forced opening of the blinds so that the appliance can be filled with products.

Configuration

Function		Input/Settings menu					Setting

	DI3	DI4	DI5	DI6	DI7	DI8
	o84	P55	P56	P57	P58	P59

Not used	+	+	+	+	+	+	0
Night blind	+	+	+	+	+	+	12
Light	+	+	+	+	+	+	16

Extra light	+	+	+	+	+	+	17
No defrost	+	+	+	+	+	+	18

Override light	+	+	+	+	+	+	19
Central + decentral	16				16
light override
Central + decentral		17				17
override of extra light

Central + decentral override of night			12			12	+o38 = 5
blind + on light

Central + decentral override of night			12			12	+o38 = 6
blind, but without light

Example

If DI3 is used to activate a night blind, o84 must be set to 12.

AK-CT 201A

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