Danfoss EKE 1P User guide
User Guide
Stepper Valve Extension Module
Type EKE 1P
ADAP-KOOL® Refrigeration Control System
www.danfoss.com
User Guide | Stepper Valve Extension Module, Type EKE 1P
Contents
Introduction................................................................................................................................................................................................................. |
3 |
Application 1............................................................................................................................................................................................................... |
4 |
Application 2............................................................................................................................................................................................................... |
4 |
User Interface.............................................................................................................................................................................................................. |
5 |
End-user overview with graphical display........................................................................................................................................................ |
7 |
Service and commissioning with graphical display...................................................................................................................................... |
7 |
Menu.............................................................................................................................................................................................................................. |
8 |
Alarm list.................................................................................................................................................................................................................... |
11 |
ERR31........................................................................................................................................................................................................................... |
12 |
Connections.............................................................................................................................................................................................................. |
13 |
Technical Data.......................................................................................................................................................................................................... |
14 |
Installation considerations.................................................................................................................................................................................. |
14 |
Mounting/dimensions.......................................................................................................................................................................................... |
15 |
Ordering..................................................................................................................................................................................................................... |
15 |
2 | BC320219567793en-000201 |
© Danfoss | DCS (vt) | 2020.03 |
User Guide | Stepper Valve Extension Module, Type EKE 1P
Introduction
Application
The controller is used as an extension module for other Danfoss controllers (application 1 below) or as a stepper valve driver (application 2 below).
Application 1
EKE 1P
CAN RJ |
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CCMT/ETS/CCM
Application 2
Fig. 1 |
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EKE 1P |
< 3m |
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CAN RJ |
PLC V 
MMIGRS2
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CCMT/ETS/CCM
Advantages
•Simplified settings:
–For application 1, typically the controller needs no parameter adjustment
–For application 2, only a few key parameter settings may be required
•Power Supply:
–Easy wiring layout. With no risk of causing short circuits when connecting to other units through power supply
–24 V AC or 24 V DC: flexibility in selecting different transformers
•Universal valve support:
–Drives bipolar and unipolar valves
–Danfoss standard valves selectable through drop-down
–Flexible configuration of valve driver parameters for nonDanfoss standard valves
Input and output
In application mode 1, all input and output are defined via the master controller AK-PC set-up.
In application mode 2, the input and output are intended for one specific function.
The overview of connections can be seen on page 12.
Operation
The daily operation can be set up via an external display device although this is normally not required for application 2.
The normal operation screen for application 1 is shown below. During set-up, the display images will be adjusted so that only the relevant images are opened for additional setting and end-user operation.
The operation is password protected, and three levels of access can be granted.
The controller contains English language only.
Two sets of LEDs on the EKE 1P indicate the EKE 1P application confirmation, valve status and alarm condition – see details further below.
Data communication
The controller has a built-in CANBUS and a built-in MODBUS interface. The interfaces are used as shown in below table:
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Application 1 |
Interface to master |
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Application 2 |
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Fail-safe valve closure
As a stepper valve is provided with step motor, it will remain open in a power failure situation.
For safety reasons, the liquid flow through the stepper valve must be cut off if a power failure occurs.
There are two ways of coping with this situation.
One of the following two solutions can be applied in the system:
•Mounting of a solenoid valve in front of EEV
•Connection of a battery back-up for EEV valve
If the battery back-up is used, the battery voltage may be continuously monitored to generate an alarm in case the battery voltage gets out of range. As default this alarm is disabled.
© Danfoss | DCS (vt) | 2020.03 |
BC320219567793en-000201 | 3 |
User Guide | Stepper Valve Extension Module, Type EKE 1P
Application 1
Application mode
In application 1, the EKE 1P operates as an extension module to a CO2 pack controller, AK-PC. It is possible to configure if the EKE 1P is used as an extension module where the stepper output controls the high pressure, or as an extension module where the stepper output controls the receiver pressure.
This is configurable through a software setting (parameter “Mode”) or through a hardware configuration. As default the hardware configuration is enabled, which means the AI4 input is used for the configuration as follows:
AI4 open circuit or connected to 0 V (COM): high-pressure valve driver
AI4 connected to 5 V+: receiver valve driver
The IO configuration of application 1 is determined through the configuration of the AK-PC.
Some, all or a sub-set of the inputs and outputs may be used. See documentation of the specific AK-PC for details.
Valve configuration
In application mode 1, the valve type is configured via the AK-PC. Only if the valve type is set to “User Defined” in the AK-PC, it is required to access the EKE 1P parameter list for configuring the valve specific parameters like number of steps, max current etc.
In application mode 1, the EKE 1P will set the valve opening degree to a fixed value in case of losing the CANBUS communication to the AK-PC. As default the valve will close in this case.
Application 2
Valve configuration
The valve type can be selected from an extensive list of Danfoss standard valve types. When a standard type is selected, only a few parameters need to be set i.e. a valve neutral zone, the valve overdrive and valve opening degree in special situations.
If Danfoss standard valve type is not selected, app. 20 parameters for the valve and valve motor control become visible (“Valve motor type”, “Valve drive current” etc.). See “Menu” for details.
Analogue input scaling
The EKE 1P may be configured for various voltage ranges, e.g.
2 – 10 V. Here the valve will be 0% open at 0 V and 100% open at 10 V and proportionally opened in values between. Typical input ranges may be configured or the voltage range may be freely configured within 0 – 10 V and 10 – 0 V.
Note: if the minimum is set to 0 V, the valve will start opening at 0.1 V to ensure detection of a valve closure signal (0 V).
Valve neutral Zone
The EKE 1P controller has a complex algorithm implemented to handle oscillation issues related to output valve OD by defining some neutral zone. In neutral zone, the valve will not move until it overcomes the definite variation in the valve opening degree.
Valve Overdrive
To compensate for lost steps, the valve may be overdriven when it closes to 0%. i.e. it will close with extra steps to make sure that it is fully closed. This may, however, lead to increased wear on the valve if it occurs frequently. To prevent this, the overdrive will only be enabled when the valve opening degree exceeds a set value and the overdrive function may only re-occur within a set interval.
4 | BC320219567793en-000201 |
© Danfoss | DCS (vt) | 2020.03 |
User Guide | Stepper Valve Extension Module, Type EKE 1P
User Interface
LED alarm and status indication
LED indication:
Two sets of Light Emitting Diodes make it possible to follow the operation status of the valve and the controller.
Red |
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Green |
Green |
LED A: Two status LEDs indicate power and controller operation
Power-up:
1. AI valve driver module |
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2. HP module |
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3. Receiver module |
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Normal operation:
4. Power |
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5. MODBUS error power |
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6. Power main switch OFF |
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main switch = OFF. |
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= Red
= Green
© Danfoss | DCS (vt) | 2020.03 |
BC320219567793en-000201 | 5 |
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