Danfoss EKC 366 Interface User Guide

Danfoss EKC 366 Interface

The controller is used for regulating a valve in a refrigerating system – for example in connection with:

• Long-term storage of fruits and vegetables
• Refrigerating plant
• Brewery systems
• Processing plant

Application

• Here the controller has been specially designed for the following functions: Maintenance of a constant evaporating pressure A temperature sensor in the valve’s actuator will regulate its temperature.
• This temperature is an indication of the pressure in the valve, and the interface module will keep this temperature constant.
• The media temperature is regulated by a PLC or similar device Here the interface module receives a variable signal from the PLC and will subsequently regulate the valve so that the refrigeration will be as accurate as possible.

System

• The controller must always be used in conjunction with a pilot valve of the types shown here.
• The most commonly used one is the pilot valve CVQ in conjunction with the main valve PM3 (sketched out above).

Valve types

• CVQ + PM
• KVQ
• TQ
• PHTQ
• TEACH
•  CVMQ

Function

The valve constantly receives feedback on the pressure in the evaporator. Whatever the variations in the suction pressure from the compressor, this feedback will produce the result that the evaporating pressure is kept constant. In conjunction with the controller, an electronic constant-pressure valve is thus obtained. Inserted between the controller and the actuator is a so-called inner regulating loop. This loop will – via an NTC resistance – constantly control the temperature in the actuator. In an application where a PLC or similar device is used for regulating a media temperature, the regulating system will in this way be supplied with an outer regulating loop – which will result in great regulating accuracy.

Survey of functions

Function| Para- meter| Parameter by operation via data communication
---|---|---
Temperatur e regulation|  | Actuator temperature
Display of valve temperature

The display constantly shows the valve’s temperature. The display is filtered throughout approx. 10 seconds

| –| Actuator temp.
Valve’s basic temperature reference

This temperature setting is the valve’s basic setting. At this value, no signal must be received from an external regulation.

The setting value is taken from one of the curves shown and may be fine- adjusted later when the valve has reached the temperature (read the manometer in the system). (Push both buttons simultaneously to set the menu)

| –| SP Temp.
Temperature uni t

Set here whether the controller is to show the temperature values in °C or °F. If dication in °F is selected, other temperature settings will also change over to Fahrenheit, either as absolute values or as delta values.

| r05| Temp. unit (°C=0, °F=1)

(In AKM only °C is displayed, whatever the setting).

The input signal’s temperature influence

This setting determines how much the input signal has to raise the temperature in the valve. You should aim at selecting the value so that the valve can close at the highest occurring evaporating pressure when the input signal is maximum (value to be set in Kelvin)

| r06| Ext. Ref. offset K
Reference

The valve’s temperature is regulated based on the basic setting plus the signal from the external regulation. (Reference = SP Temp + percentage of “r06”.)

The reference can be seen when you push the lower of the two buttons

| –| Actuator Ref.
Sundry configurations|  | Miscellaneous
External signal

Here you set the signal that is to be connected to the controller. 0: no signal

1: 4-20 mA

2: 0-20 mA

3: 0-10 V

4: 2-10 V

| o10| AI Type
Frequency

Set network frequency

| o12| 50 / 60 Hz

(50=0, 60=1)

Data communication

If the controller is built into a network with data communication, it must have an address, and the master gateway of the data communication must then know this address.

These settings can only be made when a data communication module has been mounted in the controller and the installation of the data communication cable has been completed.

This installation is mentioned in a separate document “RC.8A.C”.

|  | ****

Following the installation of a data communication module, the controller can be operated on a par with the other controllers in ADAP-KOOL® refrigeration controls.

The address is set between 1 and 60| o03
The address is sent to the gateway when the menu is set in pos. ON| o04
Language

This setting is only required when data communication is connected to the controller. Settings: 0=English, 1=German, 2=French, 3=Danish, 4=Spanish, and 6= Swedish When the controller is operated via data communication, the texts in the right-hand column will be shown in the selected language.

When you change the setting to another language you must activate o04 before “the

new language” can be visible from the AKM program.

| o11| Language
Service|  |
The signal will be constantly updated. If you wish to follow the signal beyond the 20 seconds, the time-out period, push one of the two buttons before the time-out period expires|  |
External current signal

Here you can read the value of the current signal received by the controller at its input

| u06| AI mA
External voltage signal

Here you can read the value of the voltage signal received by the controller at its input

| u07| AI Volt

Operation

Display
The values will be shown with three digits, and with a setting you can determine whether they are to be shown in °C or °F.

LED’s on the front panel
There is one LED on the front panel which will light up when power is sent to the pilot valve. There are furthermore three LEDs which will ask if there is an error in the regulation. In this situation, you can show the error code on the display and cut out the alarm by giving the upper button a brief push.

The controller can give the following messages:

E1| Errors in the controller
E11| The valve’s actuator temperature is outside its range
E12| Input signal outside its range

The buttons
When you want to change a setting, the two buttons will give you a higher or lower value depending on the button you are pushing. But before you change the value, you must have access to the menu. You obtain this by pushing the upper button for a couple of seconds – you will then enter the column with parameter codes. Find the parameter code you want to change and push the two buttons simultaneously. When you have changed the value, save the new value by once more pushing the two buttons simultaneously.

• Gives access to the menu
• Gives access to changes
• Saves a change

Examples of operations
Set the valve’s basic temperature reference

1. Push the two buttons simultaneously
2. Push one of the buttons and select the new value
3. Push both buttons again to conclude the setting

Read the valve’s regulating reference

1. Push the lower button (After approx. 20 seconds the controller automatically returns to its setting, and it again shows the valve’s actual temperature)

Set one of the other menus

1. Push the upper button until a parameter is shown
2. Push one of the buttons and the parameter you want to change
3. Push both buttons simultaneously until the parameter value is shown
4. Push one of the buttons and select the new value
5. Push both buttons again to conclude the setting

Menu survey
This setting will only be possible if a data communication module has been installed in the controller.

Define input signal 0: no signal

1: 4 – 20 mA

2: 0 – 20 mA

3: 0 – 10 V

4: 2 – 10 V

|

o10

|

0

|

4

Language (0=English, 1=German, 2=french, 3=Danish, 4=Spanish, 6=Swedish). When you change this setting you must also activate o04.|

011*

|

0

|

6

Set supply voltage frequency| o12| 50 Hz| 60 Hz
Service Information
Read the value of the external current signal| u06| mA
Read the value of the external voltage signal| u07| V

Factory setting
If you need to return to the factory-set values, it can be done in this way:

• Cut out the supply voltage to the controller
• Keep both buttons depressed at the same time as you reconnect the supply voltage

Valve’s working temperature

Without external signal
The working temperature must be set based on one of the following curves. Find the actuator temperature corresponding to the required evaporating temperature (push). Set the value in the controller as mentioned under “Set the valve’s basic temperature reference”.

With external signal
If the valve is to be operated with an external signal, two settings have to be made. One is as mentioned to the left, and the other determines how much the signal must be able to raise the temperature in the valve. This value is also read on one of the following curves. Set the value in the r06 menu. If the set value is too low, the valve will not be able to close/ open fully.

Example
CVQ type = 0-6 bar
Refrigerant = R717

A constant evaporating temperature or input pressure to the valve of -9°C (2 bar) is required. According to the CVQ curve, this will require a temperature in the actuator of 80°C. Set the valve’s basic temperature reference at 80°C. When the valve has reached its working temperature, it may be necessary to adjust the setting from the system’s manometer.

Data

Supply voltage

| 24 V a.c. +/-15% 50/60 Hz, 80 VA

(the supply voltage is galvanically separated

from the input and output signals)

---|---
Power consumption| Controller Valve| 5 VA

75 VA

Input signal| 4-20 mA, 0-20 mA, 0-10V d.c. or

2-10 V d.c.

Actuator

| ****

Input

| Temperature signal from the sensor in actual- tor
Output| Pulsating 24 V a.c. to the actuator
Data communication| Possible to connect a data communication module
Ambient temperature| During operation During transport| -10 – 55°C

-40 – 70°C

Enclosure| IP 20
Weight| 300 g
Mounting| DIN rail
Display| LED, 3 digits
Terminals| max. 2.5 mm2 multicore

Approvals

| EU Low Voltage Directive and EMC demands re CE-marking complied with.

LVD-tested acc. to EN 60730-1 and EN 60730- 2-9

EMC-tested acc. to EN 50081-1 and EN 50082-2

Ordering

084B7092

EKA 174

| Data communication module (ac- accessories), (RS 485 module) with galvanic separation| ****

084B7124

Connections

Necessary connections

Terminals

• 25-26 Supply voltage 24 V a.c. 80 VA
• 17-18 Signal from NTC sensor in valve
• 23-24 Supply to valve’s PTC resistance
• Control signal, if applicable (see also o10)

Either terminals

• 15-16 Voltage signal or
• 18-19 Current signal
• Data communication, if applicable

Terminals
3-4 Mount only, if a data communication module has been mounted. The installation of the data communication cable must be done correctly. Cf. separate literature No. RC8AC…

Data communication

This page contains a description of a few of the possibilities you will have when the controller is provided with data communication. If you want to know more about the operation of controllers via PC, you may order additional literature.

Examples

• Each controller is provided with a plug-in module.
  The controllers are then connected to a two-core cable. Up to 60 controllers may be connected to one cable.

• This cable is also connected to a gateway type AKA 243.

• This gateway will now control the communication to and from the controllers.

• It will collect temperature values and it will receive alarms.

• When there is an alarm the alarm relay will be activated for two minutes

• The gateway can now be connected to a modem.

• When an alarm occurs from one of the controllers, the gateway will – via the modem – make a phone call to the service company.

• At the service company a modem, gateway and PC with system software type

• AKM has been installed.

• All the controllers’ functions can now be operated from the various menu displays.

• The programme will for example upload all the collected temperature values once a day.

Example of menu display

• Measurements are shown on one side and settings on the other.
• You will also be able to see the parameter names of the functions on page 3.
• With a simple change-over, the values can also be shown in a trend diagram.
• If you prefer to see the earlier temperature measurements, you may upload a log collection.

Alarms

• If the controller is extended with data communication, it will be possible to ne the importance of the transmitter alarms.
• The importance is denied with the setting: 1, 2, 3 or 0. When the alarm then arises at some time, it will result in one of the following activities:

1 = Alarm
The alarm message is sent with alarm status 1. This means that the gateway which is the master in the system will have its alarm relay output activated for two minutes. Later, when the alarm ceases, the alarm text will be retransmitted, but now with a status value of 0.

2 = Message
The alarm text is transmitted with status value 2. Later, when the “message” lapses, the alarm text is retransmitted, but now with a status value of 0.

3 = Alarm
As “1”, the master gateway’s relay output is not activated.

0 = Suppressed information
The alarm text is stopped at the controller. It is transmitted nowhere.

Danfoss can accept no responsibility for possible errors in catalogues, brochures and other printed material. Danfoss reserves the right to alter its products without notice. This also applies to products already on order provided that such alternations can be made without subsequential changes being necessary for specications agreed. All trademarks in this material are the property of the respective companies. Danfoss and Danfoss logotype are trademarks of Danfoss A/S. All rights reserved.

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