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Danfoss EKE 1A User Manual
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Danfoss EKE 1A User Manual

Danfoss EKE 1A User Manual

Superheat controller and stepper valve driver
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User Guide
Superheat controller and stepper valve
driver
Type EKE 1A, 1B, 1C (PV05), 1D (PV02)
For air conditioning, commerical/Industrial heatpumps and refrigeration applications

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Summary of Contents for Danfoss EKE 1A

  • Page 1 User Guide Superheat controller and stepper valve driver Type EKE 1A, 1B, 1C (PV05), 1D (PV02) For air conditioning, commerical/Industrial heatpumps and refrigeration applications...
  • Page 2 Superheat controller and stepper valve driver, Type EKE 1A, 1B, 1C, 1D Contents Introduction Portfolio overview Installation Environmental conditions Mounting General Connection’s overview Cabling lengths for di erent connections Connecting Relay Outputs Temperature Sensor Mounting Power and signal sharing 3.7.1 Sharing Power Sources 3.7.2...
  • Page 3 Superheat controller and stepper valve driver, Type EKE 1A, 1B, 1C, 1D 6.2.2 Temperature Control Parameters 6.2.3 O setting Superheat, Temperature and OD Via External signal 6.2.4 Compressor feed Forward function Other features and modes 6.3.1 Startup and Defrost Modes 6.3.2...
  • Page 4 Superheat controller and stepper valve driver, Type EKE 1A, 1B, 1C, 1D 1 Introduction The exible pre-programmed EKE superheat controller from Danfoss provides ultimate software control, allowing you to tailor the performance of your system to your exact requirements. EKE is ideal for controlling a wide range of commercial air conditioning and refrigeration applications, such control helps you to achieve the highest e ciency in the system reducing the operational cost by up to 20% with minimal e ort.
  • Page 5 Superheat controller and stepper valve driver, Type EKE 1A, 1B, 1C, 1D 2 Portfolio overview Table 1: Portfolio overview Features EKE 1A EKE 1B EKE 1C EKE 1D Power supply Power Supply Type 24 V AC / DC ± 20% •...
  • Page 6 Stepper motor valves M12 Angle Cables EKE is compatible with Danfoss stepper motor valves i.e Danfoss ETS 6, ETS 8M Various lengths of standard M12 cable are available for connecting stepper motor (Bipolar) / ETS / ETS Colibri® / ETS L, KVS / KVS Colibri® and CCM / CCMT / CCMT L / valves.
  • Page 7 Superheat controller and stepper valve driver, Type EKE 1A, 1B, 1C, 1D 3 Installation 3.1 Environmental conditions Table 5: Environmental conditions Operating conditions -20 – 60 °C, 90% RH non-condensing Storage / Transport conditions -30 – 80 °C, 90% RH non-condensing...
  • Page 8 Superheat controller and stepper valve driver, Type EKE 1A, 1B, 1C, 1D Figure 3: EKE 1A connection overview Master controller Optional MMIGRS2 Display CAN RJ 080G0294 (optional) *Note; IF Dl1(ON/O ) switch is not used it Pressure Transmitter must be turned o in Ratiometric 0.5 –...
  • Page 9 Superheat controller and stepper valve driver, Type EKE 1A, 1B, 1C, 1D Figure 4: EKE 1B connection overview Master controller MMIGRS2 Display MODBus CAN RJ 080G0294 (optional) Supervisor MMIMYK network Gateway AKS Cable connection 060G1034 Pressure transmitter CAN RJ CAN RJ e.g.
  • Page 10 Superheat controller and stepper valve driver, Type EKE 1A, 1B, 1C, 1D Figure 5: EKE 1C - Front board connection overview Master controller Note: If Dl1(On/Off ) switch is not used it must be short circuited Pressure Transmitter Ratiometric 0.5 – 4.5 V...
  • Page 11 Superheat controller and stepper valve driver, Type EKE 1A, 1B, 1C, 1D Figure 6: EKE 1C - Back board connection overview Superheat controller Superheat controller EKE 1C - 080G5400 C1 NO1 Power power supply C1 NC1 – 18 V Alarm Relay...
  • Page 12 Superheat controller and stepper valve driver, Type EKE 1A, 1B, 1C, 1D  NOTE: • EKE 2U Backup power module is recommended to ensure closure of the electronic valves. in case of power failures • If Dl1(On/O ) switch is not used it must be short circuited •...
  • Page 13 • The stepper motor is connected to the “Stepper Valve” terminals (see terminal assignment) with Danfoss M12 connection cable. • To con gure stepper motor valves other than Danfoss stepper motor valves, the correct valve parameters must be set as described in the Valve con guration section (see the con guration section for details).
  • Page 14 Superheat controller and stepper valve driver, Type EKE 1A, 1B, 1C, 1D Table 13: Recommended wire size and cable distance between EKE controller and stepper motor valve 1 m – 15 m 15 m – 30 m Cable length 0.52 / 0.33 mm (20 / 22 AWG) 0.33 mm...
  • Page 15 Superheat controller and stepper valve driver, Type EKE 1A, 1B, 1C, 1D  NOTE: • Mount sensor on a clean surface without any paints • Remember to put on heat conducting paste and insulate the sensor • Sensor mounting max. 5 cm from the outlet of the evaporator •...
  • Page 16 SHARING EKE 2U WITH 2 CONTROLLERS Danfoss recommends using EKE 2U as the preferred battery backup device, for more details check the EKE 2U datasheet. The battery backup device power rating Watt/VA must match the valves requirements  NOTE: •...
  • Page 17 3.7.3 Sharing pressure sensor signal For EKE 1A, EKE 1B, EKE 1D up to 5 controllers can share one Ratiometric pressure transmitter readings. To get a correct acquisition on all the units all the three wires (GND, 5V and transmitter signal, output) must be routed to...
  • Page 18 Superheat controller and stepper valve driver, Type EKE 1A, 1B, 1C, 1D [G013 - Signal sharing Pc] [G014 - Signal sharing S3] • If two or more sensors are connected to same sharing group, the controller which start up as the rst one will broadcast the signal.
  • Page 19 Superheat controller and stepper valve driver, Type EKE 1A, 1B, 1C, 1D Figure 17: Receiving signal via Modbus Master controller RS485 MODbus Sensor values Temperature sensor EKE controller Pressure transmitter © Danfoss | Climate Solutions | 2024.08 BC398828796060en-000103 | 19...
  • Page 20 Superheat controller and stepper valve driver, Type EKE 1A, 1B, 1C, 1D 4 Applications EKE series devices are used where precise control of superheat in air conditioning system is needed. It helps achieving high energy e ciency and reliable operation EKE serves 2 main applications: •...
  • Page 21 Superheat controller and stepper valve driver, Type EKE 1A, 1B, 1C, 1D Figure 19: Temperature control application Preset OD / Defrost Heat / cool mode main switch Battery Power 24 V AC / 24 V DC External reference Optional connection...
  • Page 22 Superheat controller and stepper valve driver, Type EKE 1A, 1B, 1C, 1D 4.3 Typical EKE applications The EKE 1x series can be used for various refrigeration applications like Chiller, Reversible Chillers, Reversible Heat pump, AC air handler, cold room Standalone, Multi evaporators ext.
  • Page 23 Superheat controller and stepper valve driver, Type EKE 1A, 1B, 1C, 1D Figure 23: Reversible Chiller Heating ETS Colibri® Reversible heat pump Figure 24: Air to water heat pump cooling ETS Colibri® controller controller © Danfoss | Climate Solutions | 2024.08...
  • Page 24 Superheat controller and stepper valve driver, Type EKE 1A, 1B, 1C, 1D Figure 25: Air to water heat pump cooling ETS Colibri® controller controller AC air handler Figure 26: AC air handler ETS Colibri® Cold Room © Danfoss | Climate Solutions | 2024.08...
  • Page 25 Superheat controller and stepper valve driver, Type EKE 1A, 1B, 1C, 1D Figure 27: Cold Room Cold room controller ETS Colibri® In door Out door Multi evaporator Figure 28: Multi evaporator ETS Colibri® ETS Colibri® controller controller © Danfoss | Climate Solutions | 2024.08...
  • Page 26 Superheat controller and stepper valve driver, Type EKE 1A, 1B, 1C, 1D 5 User Interface In this section the user interfaces are described. EKE 1x controllers can be used with 2 main user interfaces: • MMI display • KoolProg Software 5.1 Con guration using MMI Display...
  • Page 27 Superheat controller and stepper valve driver, Type EKE 1A, 1B, 1C, 1D Figure 30: MMIGR2 Back view CAN connector Termination Jumper between R and H For cable >3m (only EKE 1C) 2-way screw connector for power supply 4-way screw connector for CANbus network ...
  • Page 28 Superheat controller and stepper valve driver, Type EKE 1A, 1B, 1C, 1D Figure 31: MMI setup and service Power on Login PW: Commissioning 300 Service 200 Daily 100 Press and hold enter Setup and service Status menu Reference QR code...
  • Page 29 Superheat controller and stepper valve driver, Type EKE 1A, 1B, 1C, 1D Table 15: Navigation through MMIGRS2 Unit Status Function Description Home screen Shows the operating status. Right x1 Active alarms Access to Active alarm list. Press UP and Down button to see complete list...
  • Page 30 Superheat controller and stepper valve driver, Type EKE 1A, 1B, 1C, 1D Table 16: Examples Parameter Navigation Parameter change(R012) Factory re-setting of display: Navigation and reading the status of the parameters For examples, parameter R012 (for the main switch). Pressing the bottoms X and ENTER at the same is possible.
  • Page 31 Superheat controller and stepper valve driver, Type EKE 1A, 1B, 1C, 1D  NOTE: This mode only has a home screen and do not have any menu structure. All function is carried out using the “Escape”, “Up”, “Down” and “Enter” buttons on MMIGRS2 Service mode is only available via MMIGRS2 display.
  • Page 32 • Find all the technical documentation for each controller model within one location 4.2.1 Setting Up KoolProg KoolProg software supports wide range of Danfoss product, so rst you need to select the EKE 1x series from the preferences. Figure 37: Setting Up KoolProg Then if you want to setup, click the set parameter and select a new project ©...
  • Page 33 Superheat controller and stepper valve driver, Type EKE 1A, 1B, 1C, 1D Figure 38: Setting Up KoolProg Then select the EKE variant you have Figure 39: Setting Up KoolProg Figure 40: Setting Up KoolProg  NOTE: • The product code number and product versions are found in the product label.
  • Page 34 Superheat controller and stepper valve driver, Type EKE 1A, 1B, 1C, 1D The KoolProg wizard, is a tool that allows you to quickly set the parameters for your speci c application. The work ow for the wizard is as follows:...
  • Page 35 Superheat controller and stepper valve driver, Type EKE 1A, 1B, 1C, 1D Figure 45: Con guration using KoolProg wizard 4.2.3 KoolProg Set parameters menu The main menu is used to get a con guration le with the desired settings that can be uploaded to EKE 1x devices, you can customize the parameter according to your speci c application.
  • Page 36 Superheat controller and stepper valve driver, Type EKE 1A, 1B, 1C, 1D Figure 47: Uploading the settings to EKE Table 17: KoolProg main Menu Summary Parameter Group Setup description Main switch, Mode selection Reference General control parameter for example selecting control mode, protection function ext.., it is divided into 3...
  • Page 37 Superheat controller and stepper valve driver, Type EKE 1A, 1B, 1C, 1D 4.2.5 KoolProg On-line service Menu: The service menu allows a quick analyze controller behavior and program patterns by using the graphical tool. It is also possible to make online changes to parameter con gurations and monitor live status of inputs and outputs.
  • Page 38 Superheat controller and stepper valve driver, Type EKE 1A, 1B, 1C, 1D Figure 52: Logging parameters as graphs 5.3 Quick Con guration Apart from wizard setup, users can also use the following section which describes quick parameter settings for general applications. For both mode Controller Mode or Driver Mode. The parameters are explained in more detail in the following section.
  • Page 39 Superheat controller and stepper valve driver, Type EKE 1A, 1B, 1C, 1D Figure 53: Quick guide for parameter selection Driver Controller Make sure that main switch is OFF before changing Start : Main switch= Off the settings. The setting will depend on the system requirement.
  • Page 40 Superheat controller and stepper valve driver, Type EKE 1A, 1B, 1C, 1D 6 Con guration 6.1 Driver Mode In this mode The EKE 1x is acting as stepper motor valve driver, where master is commanding the valve opening degrees to the EKE controller. In this mode, no sensor is needed as we are not doing any superheat control. The control signal can be: •...
  • Page 41 Superheat controller and stepper valve driver, Type EKE 1A, 1B, 1C, 1D 6.1.2 Driver Mode using Communication Bus Driver Mode using Communication Bus The opening degree of a stepper valve can be operated manually between 0% and 100% OD via communication bus.
  • Page 42 Superheat controller and stepper valve driver, Type EKE 1A, 1B, 1C, 1D Parameter Function Selector Description Temperature Correction value for temperature sensor. This value is de ned by the R009 Sensor S2 De ned by the user in K user.
  • Page 43 Superheat controller and stepper valve driver, Type EKE 1A, 1B, 1C, 1D Table 23: Fixed superheat parameters Parameter Function Description R102 Operation mode 0 = SH Control N021 SH reference mode 0 = Fixed Superheat N107 SH xed setpoint The xed superheat reference de ned by the user.
  • Page 44 Superheat controller and stepper valve driver, Type EKE 1A, 1B, 1C, 1D Parameter Function Description Safety feature to prevent the ooding of the liquid into the compressor. When the measured superheat goes N117 SH close Function bellow the SH close setpoint (parameter N119) 0 = O | 1 = On, default = 1 It is recommended to set the SH close setpoint 2k below the minimum SH.
  • Page 45 Superheat controller and stepper valve driver, Type EKE 1A, 1B, 1C, 1D Delta Temperature Reference Table 28: Delta Temperature Reference Applicable In delta temperature, the reference is calculated using evaporator pressure Po and Media temperature S3. It is based on the fact that most evaporators have a good e ciency if the SH reference is set to be 0.65 multiplied by temperature di erence from inlet temperature to evaporating temperature.
  • Page 46 Superheat controller and stepper valve driver, Type EKE 1A, 1B, 1C, 1D Table 30: Temperature Control Parameters Applicable These modes require one extra temperature sensor S3 or S4, the user can select only one sensor not both.  WARNING: Superheat control with Thermostatic Mode is not available on EKE 1A.
  • Page 47 Superheat controller and stepper valve driver, Type EKE 1A, 1B, 1C, 1D Table 31: ON/OFF thermostat parameters Parameter Function Description -Uses a temperature setpoint (parameter R101), and the di erential con- stant(R001). R014 Thermostatic Mode (1-Cutin /cutout) -The temperature media is maintained at a level de ned by the set point.
  • Page 48 Superheat controller and stepper valve driver, Type EKE 1A, 1B, 1C, 1D 6.2.3 O setting Superheat, Temperature and OD Via External signal Temperature and superheat references can be displaced in positive or negative direction using a current signal (EKE1C only), voltage signal or via Modbus.
  • Page 49 Superheat controller and stepper valve driver, Type EKE 1A, 1B, 1C, 1D Parameter Function Description I036 Ext ref. current low De ne min. reference current I037 Ext ref. current high De ne max. reference current X010 Bus ext. ref Readout o set in Kelvin...
  • Page 50 Superheat controller and stepper valve driver, Type EKE 1A, 1B, 1C, 1D Figure 63: Compressor feedforward function Compressor speed signal via MODbus Master control Table 38: Compressor feed Forward Parameter Function Description N135 Comp. speed feed forward function 0 = O | 1 = On, default O...
  • Page 51 Superheat controller and stepper valve driver, Type EKE 1A, 1B, 1C, 1D Figure 64: proportional control startup mode Min start Start time time The Pctrl is active in the min start time and until SH cross the reference SH ref SH crosses the SH reference after the “min...
  • Page 52 Superheat controller and stepper valve driver, Type EKE 1A, 1B, 1C, 1D Table 41: Start OD with protection Parameter Function Description Startup N102 1 = Minimum OD with protection mode Startup Min value: 1 second | Max value: 600 seconds...
  • Page 53 Superheat controller and stepper valve driver, Type EKE 1A, 1B, 1C, 1D The user sets the Defrost OD, the Defrost end OD, defrost start and end time (see table below). The defrost start/end commands are received from one of the following options: Modbus register (nonvolatile memory) –...
  • Page 54 Superheat controller and stepper valve driver, Type EKE 1A, 1B, 1C, 1D Fail Safe Operation In the case of sensor error, the EEV controller will go into an emergency mode (“safe mode”). where the valve opening degree is de ned by desired OD scheme as described below User can read the failure status via [U118 Operation status].
  • Page 55 Superheat controller and stepper valve driver, Type EKE 1A, 1B, 1C, 1D Figure 69: SH close operation SH close is active Superheat Auto SH control reducing OD fast Auto SH control to get SH back to reference Superheat SH Ref...
  • Page 56 Superheat controller and stepper valve driver, Type EKE 1A, 1B, 1C, 1D Maximum Operating Pressure (MOP) Maximum Operating Pressure (MOP) will make sure that the evaporating pressure (P0) is kept below the MOP setpoint set by the user. This is achieved by lowering the ow in the expansion valve. When this mode is active this Super heat reference will be higher, the controller will switch back to superheat control once the pressure Po is kept on the MOP setpoint.This feature is helpful especially during startup During startup and pulldown to avoid overload...
  • Page 57 Superheat controller and stepper valve driver, Type EKE 1A, 1B, 1C, 1D Figure 73: High condensing temperature protection Tc condenser temperature HCTP setpoint If condenser is above HCTP setpoint the massflow is reduced giving less load on condenser During high condenser...
  • Page 58 Superheat controller and stepper valve driver, Type EKE 1A, 1B, 1C, 1D Superheat close (it is always important to avoid liquid back to the compressor) LOP (Low operating pressure) HCTP (High condensing temperature protection) Min. S4 (Minimum S4 temperature) MOP (Maximum operating pressure) As an example, if the pressure is low and at the same time the superheat is low.
  • Page 59 Enter the Valve parameters (Parameters described below). Table 58: Parameters Non-Danfoss valves: for Danfoss vales these parameters are precon gured, if the user decides to use a valve from a di erent manufacturer, then these parameters must be provided by the user.
  • Page 60  NOTE: For half and micro stepping, the risk of step loss is higher because the torque provided is low- Danfoss recommends using 1/8 stepping mode as this provides a good balance between tor- que, speed, and smooth operation. I065 Valve duty cycle De nes the valve motion and stop time in a window of 60 seconds.
  • Page 61 Superheat controller and stepper valve driver, Type EKE 1A, 1B, 1C, 1D 6.3.5 Adding user De ned Refrigerant Most of the used common Refrigerants have been de ned as a pre selectable pro le under “Refrigerant list para O030”. for unlisted refrigerants, user de ned refrigerants can be used.
  • Page 62 Superheat controller and stepper valve driver, Type EKE 1A, 1B, 1C, 1D 7 Parameter List Table 61: Parameter list Parameter Modbus Can In‐ Can Sub‐ Label Variants Default Unit Enumeration name index Reference Refrigeration R012 Main switch 3001 550B 0 = O | 1 = On...
  • Page 63 Superheat controller and stepper valve driver, Type EKE 1A, 1B, 1C, 1D Parameter Modbus Can In‐ Can Sub‐ Label Variants Default Unit Enumeration name index 0 = no valve | 1 = User- Def | 2 = ETS 12C | 3 =...
  • Page 64 Superheat controller and stepper valve driver, Type EKE 1A, 1B, 1C, 1D Parameter Modbus Can In‐ Can Sub‐ Label Variants Default Unit Enumeration name index 0 = Not Used | 1 = De- DI2 con gu- frost Start | 2 = Preset...
  • Page 65 Superheat controller and stepper valve driver, Type EKE 1A, 1B, 1C, 1D Parameter Modbus Can In‐ Can Sub‐ Label Variants Default Unit Enumeration name index Pc current I038 3122 550C Pc current I039 3123 550C high 0 = Not de ned | 1 = AKS...
  • Page 66 Superheat controller and stepper valve driver, Type EKE 1A, 1B, 1C, 1D Parameter Modbus Can In‐ Can Sub‐ Label Variants Default Unit Enumeration name index Ext ref. con- 0 = Not Used | 1 = V->SH I090 guration | 2 = V->Max OD 0 = Not Used | 1 = V->SH...
  • Page 67 Superheat controller and stepper valve driver, Type EKE 1A, 1B, 1C, 1D Parameter Modbus Can In‐ Can Sub‐ Label Variants Default Unit Enumeration name index 0 = Prop. Ctrl | 1 = Fix OD Startup N102 3023 550B w prot | 2 = Fix OD wo...
  • Page 68 Superheat controller and stepper valve driver, Type EKE 1A, 1B, 1C, 1D Parameter Modbus Can In‐ Can Sub‐ Label Variants Default Unit Enumeration name index Compressor speed feed- N135 3055 550B 0 = O | 1 = On forward function...
  • Page 69 Superheat controller and stepper valve driver, Type EKE 1A, 1B, 1C, 1D Parameter Modbus Can In‐ Can Sub‐ Label Variants Default Unit Enumeration name index Low Min S4 A100 1200 3081 550C delay Low Min S4 A101 3082 550C band...
  • Page 70 Superheat controller and stepper valve driver, Type EKE 1A, 1B, 1C, 1D Parameter Modbus Can In‐ Can Sub‐ Label Variants Default Unit Enumeration name index Controller G001 3167 550C address 0 = 0 | 1 = 1200 | 2 =...
  • Page 71 Superheat controller and stepper valve driver, Type EKE 1A, 1B, 1C, 1D Parameter Modbus Can In‐ Can Sub‐ Label Variants Default Unit Enumeration name index User con- X037 4074 550F 0 = O | 1 = On trols LEDs User control...
  • Page 72 Superheat controller and stepper valve driver, Type EKE 1A, 1B, 1C, 1D Parameter Modbus Can In‐ Can Sub‐ Label Variants Default Unit Enumeration name index DI defrost U110 4033 550F 0 = O | 1 = On start U111 DI preset OD...
  • Page 73 Superheat controller and stepper valve driver, Type EKE 1A, 1B, 1C, 1D 8 Alarms and troubleshooting Depending on the application, the EKE 1x series implements error codes and alarms to help the user troubleshoot and correct parameters easily. When an alarm occurs, the following actions generally ensue: •...
  • Page 74 Superheat controller and stepper valve driver, Type EKE 1A, 1B, 1C, 1D Label Alarm description Actions during ac‐ Trigger (how the alarm IS How to clear the alarm Remark tive raised) E107 SH min higher than Auto operation SH max lower than SH low Adjust SH max or SH low, SH NO10 SH min.
  • Page 75 Superheat controller and stepper valve driver, Type EKE 1A, 1B, 1C, 1D 8.1.3 Stepper alarms/errors Table 64: Stepper alarms/errors Label Alarm description Actions during ac‐ Trigger (how the alarm IS How to clear the alarm Remark tive raised) E103 No valve con gured Auto operation...
  • Page 76 Superheat controller and stepper valve driver, Type EKE 1A, 1B, 1C, 1D 8.1.5 Application alarms Table 66: Application alarms Label Alarm description Actions during ac‐ Trigger (how the alarm IS How to clear the alarm Remark tive raised) A994 Low S4 media outlet...
  • Page 77 Superheat controller and stepper valve driver, Type EKE 1A, 1B, 1C, 1D 8.1.7 Stop state alarm Table 68: Stop state alarm Label Alarm Actions during ac‐ Trigger (how the alarm IS How to clear the alarm Remark descrip‐ tive raised)
  • Page 78 Superheat controller and stepper valve driver, Type EKE 1A, 1B, 1C, 1D Label Alarm name Modbus PNU Bit number Can Index Can Subindex Bit number E117 Valve emergency speed too fast 1903 5507 E118 Valve emergency speed too slow 1903...
  • Page 79 Superheat controller and stepper valve driver, Type EKE 1A, 1B, 1C, 1D Symptom Possible cause/Reaction Solution Liquid hammer in compres- Superheat reference set too low. • Increase the SH reference by changing the SH min. sor (noisy or unusual com- max.
  • Page 80 Superheat controller and stepper valve driver, Type EKE 1A, 1B, 1C, 1D Symptom Possible cause/Reaction Solution Superheat outside the de- Wrong valve selected or its valve parameter. • Check the right valve type and its setting. ned range or does not Loss of refrigerant in the system.
  • Page 81 Superheat controller and stepper valve driver, Type EKE 1A, 1B, 1C, 1D Symptom Possible cause/Reaction Solution Flash gas Loud refrigerant or undercharged refrigerant. • Charge the system with appropriate refrigerant capaci- • Check for leakage is the system. • If the valve is placed much higher than condenser tweet check pressure di erence.
  • Page 82 Superheat controller and stepper valve driver, Type EKE 1A, 1B, 1C, 1D Symptom Possible cause/Reaction Solution Valve does not move Valve neutral zone has been de ned. • Check Valve parameter in chapter Stepper motor valve. Loose or incorrect M12 cable connection.
  • Page 83 Superheat controller and stepper valve driver, Type EKE 1A, 1B, 1C, 1D 9 Appendix Table 72: Appendix 1: Acronyms and abbreviations used in this document Full name Abbreviation Compressor Comp. Capacity Controller cont Actual Temperature at evaporator outlet Media inlet temperature...
  • Page 84 Some approvals may change over time. You can check the most current status at danfoss.com or contact your local Danfoss representative if you have any questions.
  • Page 85 11 Online support Danfoss o ers a wide range of support along with our products, including digital product information, software, mobile apps, and expert guidance. See the possibilities below. The Danfoss Product Store The Danfoss Product Store is your one-stop shop for everything product related—no matter where you are in the world or what area of the cooling industry you work in.

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