丹佛斯电子膨胀阀控制器AK-CC750(2)

Defrost on demand based on evaporator capacity Appliance cleaning function

Light control using door switch or network signal depending on day/night operation

Rail heat pulsing depending on day/night operation or dew point

Monitoring of door alarm and control of light/refrigeration depending on location of door switch.

Log function for registration of historical parameter values and alarm modes.

Control

The controller’s main function is to control the evaporator so that the system constantly operates with the most energy-friendly refrigeration.

A specific function for registration of the need for defrost will adapt the number of defrosts so that no energy is wasted on un-necessary defrosts and subsequent cooling-down cycles.

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丹佛斯电子膨胀阀控制器AK-CC750

Principles

The great advantage of this series of controllers is that it can be extended as the size of the plant is increased. It has been developed for refrigeration control systems, but not for any specific application – variation is created through the read-in software and the way you choose to define the connections.It is the same modules that are used for each regulation and the composition can be changed, as required. With these modules (building blocks) it is possible to create a multitude of various kinds of regulations. But it is you who must help adjusting the regulation to the actual needs – these instructions will assist you to find your way through all the open questions so that the regulation can be defined and the connections made.

Advantages

The controller’s size can “grow” as systems grow The software can be set for one or more regulations Several regulations with the same components

Extension-friendly when systems requirements are changed Flexible concept:

- Controller series with common construction - One principle – many regulation uses

- Modules are selected for the actual connection requirements- The same modules are used from regulation to regulation

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AK-CC 750

丹佛斯电子膨胀阀控制器AK-CC750

Direct connection

Setup and operation of an AK controller must be accomplished via the “AK-Service Tool” software program.

The programme is installed on a PC, and setup and operation of the various functions are carried out via the controller’s menu displays.

Displays

The menu displays are dynamic, so that different settings in one menu will result in different setting possibilities in other menus.A simple application with few connections will give a setup with few settings.

A corresponding application with many connections will give a setup with many settings.

From the overview display there is access to further displays for the regulation.

At the bottom of the display there is access to a number of general functions, such as “time table”, “manual operation”, “log function”, “alarms”, and “service” (configuration).

Network linking

The controller can be linked up into a LON-network together with other controllers in an ADAP-KOOL® refrigeration control system.A gateway type AKA 245, or a system manager type AK-SM 350, AK-SM 720 or AK-SC 255, can be used as a system unit.

After the setup operation can be performed at a distance with, say, our software program type AKM.

Users

The controller comes supplied with several languages, one of which can be selected and employed by the user. If there are sev-eral users, they may each have their choice of language. All users must be assigned a user profile which either gives access to full operation or gradually limits the operation to the lowest level that only allows you “to see”.

External display

An external display can be fitted in order for P0 (Suction) and Pc (Condensing) readings to be displayed.

In AK-CC 750 up to 4 displays can be mounted.

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丹佛斯电子膨胀阀控制器AK-CC750

Light-emitting diodes

A number of light-emitting diodes makes it possible to follow the signals that are received and transmitted by the controller.

Log

From the log function you can define the measurements you wish to be shown.

The collected values can be printed, or you may export them to a file. You can open the file in Excel or import in AKM.(The Log function is only available via AK-ST 500.)

If you are in a service situation you can show measurements in a trend function. The measurements are then made real-time and displayed instantly.

Alarm

The display gives you an overview of all active alarms. If you wish to confirm that you have seen the alarm you can cross it off in the acknowledge field.

If you want to know more about a current alarm you can click on it and obtain an information display on the screen.

A corresponding display exists for all earlier alarms. Here you can upload information if you need further details about the alarm history.

Adaptive defrost

AK-CC 750 is equipped with an adaptive defrost function. By using an AKV valve as mass flow sensor for the supply of refrigerant the control can monitor ice formation on the evaporator.

Function can cancel planned defrosts which are not necessary, and on its own initiative start a defrost if the evaporator is about to be blocked by rime and ice.

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AK-CC 750

丹佛斯电子膨胀阀控制器AK-CC750

2. Design of a controller

This section describes how the controller is designed.

The controller in the system is based on a uniform connection platform where any devi …… 此处隐藏：5475字，全部文档内容请下载后查看。喜欢就下载吧 ……