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EKE 1P
User guide
16 pgs1.72 Mb0
Installation guide
16 pgs1.32 Mb0

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
2 | BC320219567793en-000201 © Danfoss | DCS (vt) | 2020.03
User Guide | Stepper Valve Extension Module, Type EKE 1P
EKE 1P
CCMT/ETS/CCM
80G394
100
%
%
80G395
CCMT/ETS/CCM
ACCCBI080G0075
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
CAN RJ
AK-PC
CAN
Application 2
Fig. 1
0
Min.
Max.
Danfoss
V
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
Danfoss
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:
CANBUS MODBUS
Application 1 Interface to master
controller, AK-PC
Application 2 Configuration of EKE 1P
and daily use interface
MODBUS master for establishing communication with other MODBUS devices to the master controller, AK-PC
Not used – must not be connected to any MODBUS network
Fig. 2
PLC
< 3m
EKE 1P
CAN RJ
V
CAN RJ
MMIGRS2
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
Danfoss
80G396
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.
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 non-
Danfoss standard valves
© 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 CO 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
0s 2s1s
G
0s 2s1s
RR
GGGG
0s 2s1s
GG
0s 2s1s
GGGG
GGGG
0s 2s1s
G
0s 2s1s
G
0s 2s1s
G G GG
0s 2s1s
GGGG
GGGG
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
Green
Red
Green
LED A: Two status LEDs indicate power and controller operation
Power-up:
1. AI valve driver module
R
2. HP module
RR
3. Receiver module
RRRR
GG
RRRR
RRRR
Configured as AI controlled stepper valve ­will blink for 30 sec. after power-up.
Configured as HP module ­will blink for 30 sec. after power-up.
Configured as receiver module ­will blink for 30 sec. after power-up.
Hardware problem.
Normal operation:
4. Power
5. MODBUS error power
6. Power main switch OFF
R
= Red
G
= Green
© Danfoss | DCS (vt) | 2020.03 BC320219567793en-000201 | 5
Pattern during normal operation.
Pattern during normal operation, but MODBUS error.
RRRRRRRR
Pattern during normal operation, main switch = OFF.
Hardware problem.
RRRR
RRRR
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