Danfoss EKE 1C
Superheat controller for stepper motor expansion valves in refrigeration, air conditioning and heat pumps.
The Danfoss EKE 1C is a superheat controller that drives a stepper motor expansion valve on the evaporator of chillers, cold rooms, air conditioning and heat pumps. This Modbus RTU template reads superheat, valve opening degree, temperatures, pressures and alarms, and lets you write the main switch, setpoints and controller settings from ModbusCloud.
- Protocol
- Modbus RTU
- Connection
- RS485, 19200 baud
- Registers
- 249, read and write
- Brand
- Danfoss
- Key readings
- Actual superheat · Valve opening degree · Suction pipe temperature · Evaporating pressure · Condensing pressure · Operation status · Alarm status
- Available commands
- Main switch · Superheat setpoint · Temperature setpoint · Alarm limits · Manual opening degree
- Compatible models
- EKE 1C · EKE 1B
- Last updated
Registers (249)
249 read, 210 write
| Name | Unit | Access | Address (Hidden until you enter your email) | Function (hidden) | Type (hidden) |
|---|---|---|---|---|---|
| Actual Superheat | K | Read | |||
| Actual SH Reference | K | Read | |||
| Actual Opening Degree | % | Read | |||
| S2 Suction Pipe Temperature | °C | Read | |||
| S3 Media Inlet Temperature | °C | Read | |||
| S4 Media Outlet Temperature | °C | Read | |||
| Pe Evaporator Pressure | bar | Read | |||
| Te Saturated Evaporation Temperature | °C | Read | |||
| Pc Condenser Pressure | bar | Read | |||
| Tc Saturated Condenser Temperature | °C | Read | |||
| Operation Status | Read | ||||
| Number Of Active Alarms | Read | ||||
| Alarm Notification | Read | ||||
| Alarm Status | Read | ||||
| Warning Status | Read | ||||
| Error Status | Read | ||||
| Alarm Relay | Read | ||||
| Liquid Line Solenoid Valve | Read | ||||
| Actual Step | Read | ||||
| Actual Temperature Reference | K | Read | |||
| Actual Battery Voltage | V | Read | |||
| Thermostat Cut-in Time | min | Read | |||
| Thermostat Average Cut-in Time | min | Read | |||
| Thermostat Average Cut-out Time | min | Read | |||
| External Reference Signal Voltage | V | Read | |||
| External Reference Signal Current | mA | Read | |||
| Actual External Reference Temperature Offset | K | Read | |||
| Actual External Reference SH Offset | K | Read | |||
| DI Main Switch | Read | ||||
| DI Defrost Start | Read | ||||
| DI Preset Opening Degree | Read | ||||
| DI Heating | Read | ||||
| Average Superheat | K | Read | |||
| Average Temperature | °C | Read | |||
| Actual External Reference Maximum Opening Degree | % | Read | |||
| DI Power Backup Signal | Read | ||||
| Power Backup Status | Read | ||||
| Modbus Heating | Read and write | ||||
| Modbus Preset Opening Degree | Read and write | ||||
| Modbus Defrost Start | Read and write | ||||
| Modbus Main Switch | Read and write | ||||
| Bus Shared Pc | bar | Read and write | |||
| Bus Shared Pe | bar | Read and write | |||
| Bus Shared S2 | °C | Read and write | |||
| Bus Shared S3 | °C | Read and write | |||
| Bus Shared S4 | °C | Read and write | |||
| Bus External Reference | K | Read and write | |||
| Valve Current Position | Read | ||||
| Valve Target Position | Read | ||||
| Service Number Of Steps | Read and write | ||||
| User Controls LEDs | Read and write | ||||
| Green LED Pattern | Read and write | ||||
| Red LED Pattern | Read and write | ||||
| Main Switch | Read and write | ||||
| Operation Mode | Read and write | ||||
| Sensor Select | Read and write | ||||
| Thermostatic Mode | Read and write | ||||
| Temperature Setpoint | °C | Read and write | |||
| Temperature Differential | K | Read and write | |||
| External Reference Offset Max | K | Read and write | |||
| External Reference Offset Min | K | Read and write | |||
| S2 Correction | K | Read and write | |||
| S3 Correction | K | Read and write | |||
| S4 Correction | K | Read and write | |||
| Pe Correction | bar | Read and write | |||
| Pc Correction | bar | Read and write | |||
| Display Unit | Read and write | ||||
| Compressor Capacity | % | Read and write | |||
| Refrigerant | Read and write | ||||
| Refrigerant Factor A1 | Read and write | ||||
| Refrigerant Factor A2 | Read and write | ||||
| Refrigerant Factor A3 | Read and write | ||||
| Refrigerant Min Temperature | °C | Read and write | |||
| Refrigerant Max Temperature | °C | Read and write | |||
| DI1 Configuration | Read and write | ||||
| DI2 Configuration | Read and write | ||||
| DI3 Configuration | Read and write | ||||
| DO1 Configuration | Read and write | ||||
| Pe Transmitter Min | bar | Read and write | |||
| Pe Transmitter Max | bar | Read and write | |||
| Pc Transmitter Min | bar | Read and write | |||
| Pc Transmitter Max | bar | Read and write | |||
| External Reference Configuration EKE 1C | Read and write | ||||
| Language | Read and write | ||||
| Password Daily | Read and write | ||||
| Manual Mode Timeout | s | Read and write | |||
| Enter Service State | Read and write | ||||
| Manual Mode | Read and write | ||||
| Manual Opening Degree | % | Read and write | |||
| Manual Step | Read and write | ||||
| Manual Homing | Read and write | ||||
| Manual Relay DO1 | Read and write | ||||
| Apply Defaults | Read and write | ||||
| MTR Tn | Read and write | ||||
| MTR Kp | Read and write | ||||
| Startup Mode | Read and write | ||||
| Startup Time | s | Read and write | |||
| Min Startup Time | s | Read and write | |||
| Startup Opening Degree | % | Read and write | |||
| SH Reference Mode | Read and write | ||||
| SH Fixed Setpoint | K | Read and write | |||
| SH Max | K | Read and write | |||
| SH Min | K | Read and write | |||
| SH Tn | s | Read and write | |||
| SH Kp Min | Read and write | ||||
| SH Kp | Read and write | ||||
| SH KpTe | Read and write | ||||
| SH Reference Delta Temperature Factor | % | Read and write | |||
| SH Close Function | Read and write | ||||
| SH Close Setpoint | K | Read and write | |||
| SH Close Tn Divide | Read and write | ||||
| SH Close Kp Factor | Read and write | ||||
| Limit Kp | Read and write | ||||
| Limit Tn | s | Read and write | |||
| Min S4 Mode | Read and write | ||||
| Min S4 Setpoint | °C | Read and write | |||
| Stability | Read and write | ||||
| T0 Variance Factor | Read and write | ||||
| MOP Function | Read and write | ||||
| MOP Setpoint | °C | Read and write | |||
| LOP Function | Read and write | ||||
| LOP Setpoint | °C | Read and write | |||
| LOP Priority Mode | Read and write | ||||
| LOP Max Time | s | Read and write | |||
| LOP Oscillation Detection | Read and write | ||||
| High Condensing Temperature Protection | Read and write | ||||
| High Condensing Temperature Protection Setpoint | °C | Read and write | |||
| Compressor Speed Feed Forward | Read and write | ||||
| Compressor Feed Forward Low Capacity Point | % | Read and write | |||
| Compressor Feed Forward SH Tn Factor | Read and write | ||||
| SH Control Sensor Error Action | Read and write | ||||
| Thermostatic Sensor Error Action | Read and write | ||||
| Fixed Opening Degree During Emergency Cooling | % | Read and write | |||
| Heat Startup Time | s | Read and write | |||
| Heat Min Startup Time | s | Read and write | |||
| Heat Startup Opening Degree | % | Read and write | |||
| Heat SH Fixed Setpoint | K | Read and write | |||
| Heat SH Max | K | Read and write | |||
| Heat SH Min | K | Read and write | |||
| Heat SH Reference Delta Temperature Factor | % | Read and write | |||
| Heat SH Tn | s | Read and write | |||
| Heat SH Kp Min | Read and write | ||||
| Heat SH Kp | Read and write | ||||
| Heat SH KpTe | Read and write | ||||
| Heat SH Close Setpoint | K | Read and write | |||
| Heat Limit Tn | s | Read and write | |||
| Heat Limit Kp | Read and write | ||||
| Defrost Start Time | s | Read and write | |||
| Defrost Opening Degree | % | Read and write | |||
| Defrost End Closed Time | s | Read and write | |||
| Defrost End Opening Degree Time | s | Read and write | |||
| Maximum Opening Degree | % | Read and write | |||
| Average Opening Degree | % | Read and write | |||
| Estimated KpTe | Read and write | ||||
| Average Delta Temperature | Read and write | ||||
| Low Min S4 Delay | s | Read and write | |||
| Low Min S4 Band | K | Read and write | |||
| Upper Temperature Alarm | K | Read and write | |||
| Lower Temperature Alarm | K | Read and write | |||
| Temperature Alarm Delay | min | Read and write | |||
| Battery Alarm | Read and write | ||||
| MOP Alarm Delay | s | Read and write | |||
| MOP Alarm Differential | K | Read and write | |||
| LOP Alarm Delay | s | Read and write | |||
| LOP Alarm Differential | K | Read and write | |||
| Condensing Temperature Alarm Delay | s | Read and write | |||
| Condensing Temperature Alarm Differential | K | Read and write | |||
| High SH Alarm Delay | s | Read and write | |||
| High SH Alarm Differential | K | Read and write | |||
| Low SH Alarm Delay | s | Read and write | |||
| Low SH Alarm Differential | K | Read and write | |||
| Lack Of Capacity Alarm Delay | min | Read and write | |||
| AI1 Configuration | Read and write | ||||
| AI4 Configuration EKE 1C | Read and write | ||||
| AI5 Configuration | Read and write | ||||
| S2 Sensor Configuration EKE 1C | Read and write | ||||
| S3 Sensor Configuration EKE 1C | Read and write | ||||
| S4 Sensor Configuration EKE 1C | Read and write | ||||
| Pe Transmitter Configuration EKE 1C | Read and write | ||||
| Pe Ratio Low | % | Read and write | |||
| Pe Ratio High | % | Read and write | |||
| Pe Voltage Low EKE 1C | V | Read and write | |||
| Pe Voltage High EKE 1C | V | Read and write | |||
| Pe Current Low | mA | Read and write | |||
| Pe Current High | mA | Read and write | |||
| Pc Transmitter Configuration | Read and write | ||||
| Pc Ratio Low | % | Read and write | |||
| Pc Ratio High | % | Read and write | |||
| Pc Voltage Low | V | Read and write | |||
| Pc Voltage High | V | Read and write | |||
| Pc Current Low | mA | Read and write | |||
| Pc Current High | mA | Read and write | |||
| External Reference Current High | mA | Read and write | |||
| External Reference Current Low | mA | Read and write | |||
| External Reference Voltage High | V | Read and write | |||
| External Reference Voltage Low | V | Read and write | |||
| Driver Reference Configuration EKE 1C | Read and write | ||||
| Valve Configuration | Read and write | ||||
| Valve Motor Type | Read and write | ||||
| Valve Drive Current | mA | Read and write | |||
| Valve Step Positioning | Read and write | ||||
| Valve Total Steps | Read and write | ||||
| Valve Speed | Read and write | ||||
| Valve Start Speed | % | Read and write | |||
| Valve Emergency Speed | % | Read and write | |||
| Valve Acceleration Current | % | Read and write | |||
| Valve Acceleration Time | ms | Read and write | |||
| Valve Holding Current | % | Read and write | |||
| Valve Step Mode | Read and write | ||||
| Valve Duty Cycle | % | Read and write | |||
| Minimum Opening Degree | % | Read and write | |||
| Valve Opening Degree During Stop | % | Read and write | |||
| Start Backlash | % | Read and write | |||
| Compensation Backlash | % | Read and write | |||
| Overdrive | % | Read and write | |||
| Overdrive Enable Opening Degree | % | Read and write | |||
| Overdrive Block Time | min | Read and write | |||
| Valve Excitation Time After Stop | ms | Read and write | |||
| Preset Opening Degree | % | Read and write | |||
| Valve Neutral Zone | % | Read and write | |||
| AI4 Lowpass Bandwidth | Read and write | ||||
| AI4 Configuration EKE 1A 1B | Read and write | ||||
| S4 Sensor Configuration EKE 1B | Read and write | ||||
| S3 Sensor Configuration EKE 1B | Read and write | ||||
| S2 Sensor Configuration EKE 1B | Read and write | ||||
| S2 Sensor Configuration EKE 1A | Read and write | ||||
| Pe Transmitter Configuration EKE 1B | Read and write | ||||
| Pe Voltage High EKE 1A 1B | V | Read and write | |||
| Pe Voltage Low EKE 1A 1B | V | Read and write | |||
| External Reference Configuration EKE 1B | Read and write | ||||
| External Reference Configuration EKE 1A | Read and write | ||||
| Driver Reference Configuration EKE 1B | Read and write | ||||
| Controller Address | Read and write | ||||
| CAN Bus Min Update Interval | s | Read and write | |||
| Modbus Min Update Interval | s | Read and write | |||
| Modbus Baudrate | Read and write | ||||
| Modbus Mode | Read and write | ||||
| Modbus Mapping | Read and write | ||||
| CAN Baudrate | Read and write | ||||
| Signal Sharing Pe | Read and write | ||||
| Signal Sharing Pc | Read and write | ||||
| Signal Sharing S3 | Read and write | ||||
| Login Timeout | min | Read and write | |||
| Backlight Timeout | min | Read and write | |||
| Password Service | Read and write | ||||
| Password Commission | Read and write | ||||
| Display Contrast | % | Read and write | |||
| Display Brightness | % | Read and write | |||
| Opening Degree Unit | Read and write |
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If a device is not in the library yet, we build the template for free as soon as we have the register data.
Use cases
- Show actual superheat, opening degree and suction temperature on one dashboard per evaporator.
- Alert when the alarm status or error status turns on, or when superheat stays above a limit.
- Keep a year of superheat and media temperature history to see how a cold room behaves through the seasons.
- Switch the controller on or off remotely with the main switch register.
- Adjust the temperature setpoint or the superheat limits from ModbusCloud without going to site.
Installation
Wire the RS485 terminals D+ and D- of the EKE 1C to the RS485 port of the ModbusCloud Gateway, with a 120 ohm resistor at both ends of the bus.
Check on the controller or with the MMIGRS2 display that the address is unique on the bus and that the bus runs at 19200 baud, 8E1.
In ModbusCloud, add a Modbus device (RTU) with that address and these serial settings, and import this template.
Confirm that actual superheat, S2 temperature and Pe pressure show plausible values.
Decide which setpoints you want to write, and leave configuration registers alone while the system is running.
Things to watch for
The controller does not answer on the bus. What should I check?
The factory setting is address 1, 19200 baud, even parity, 1 stop bit. Many masters default to no parity. Swap D+ and D- if nothing answers, and check that there is a 120 ohm termination at both ends. The EKE has no bias resistors of its own.
Why do temperatures and pressures look ten times too high?
Most values are sent as whole numbers with one decimal implied, so 52 means 5.2. The template applies that scale. For the temperature setpoint the scale is not certain: check the raw value against the display once, and change the scale of that one register if needed.
Can I run several EKE controllers on one RS485 line?
Yes. Give each controller its own address in parameter G001 and keep the same speed and parity on all of them. Wire the bus as one line from device to device, without long branches.
Why is a setting not accepted when I write it?
Many configuration parameters, such as refrigerant, valve and sensor setup, can only be changed while the main switch is off. Switch the controller off, write the setting, and switch it on again. Write only values inside the range of the parameter, and change settings on a running plant with care.
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