Danfoss EKC 367 Media Temperature Controller
Principle
Dimensions
Cable length/ wire cross section
Cable length for the actuator. The actuator must be supplied with 24 V a.c. ±10%. To avoid excessive voltage loss in the cable to the actuator, use a thicker cable for large distances. If the KVQ valve is mounted lying down, shorter cable lengths are allowed than if it is mounted standing up. It must not be mounted lying down in connection with hotgas defrost if the temperature around the KVQ-valve is below 0°C.
Connection
Data communication
Connections
Necessary connections
Terminals:
- 25-26 Supply voltage 24 V a.c.
- 17-18 Signal from actuator (from NTC)
- 23-24 Supply to actuator (to PTC)
- 20-21 Pt 1000 sensor at evaporator outlet
- 1-2 Switch function for start/stop of regulation. If a switch
is not connected, terminals 1 and 2 must be shortcircuited. Application dependent connections
Terminal:
12-13 Alarm relay
There is connection between 12 and 13 in alarm situations and when the controller is dead
- 6-7 Relay switch for start/stop of defrost
- 8-10 Relay switch for start/stop of fan
- 9-10 Relay switch for start/stop of cooling
- 18-19 Voltage signal from other regulation (Ext.Ref.)
- 21-22 Pt 1000 sensor for defrost function.
Short-circuit of the terminals for two seconds (pulse signal) will start a defrost
3-4 Data communication
Mount only, if a data communication module has been mounted. It is important that the installation of the data communication cable be done correctly. Cf. separate literature No. RC.8A.C…
Operation
Display
The values will be shown with three digits, and with a setting you can determine whether the temperature are to be shown in °C or in °F.
Light-emitting diodes (LED) on front panel
There are LED’s on the front panel which will light up when the belonging relay is activated. The three lowermost LED’s will flash, if there is an error in the regulation. In this situation you can upload the error code on the display and cancel the alarm by giving the uppermost button a brief push.
| The controller can give the following messages: | ||
| E1 |
Error message | Errors in the controller |
| E7 | Cut-out Sair | |
| E8 | Shortcircuited Sair | |
| E11 | Valve’s actuator temperature outside its range | |
| E12 | Analog input signal is outside the range | |
| A1 | Alarm message | High-temperature alarm |
| A2 | Low-temperature alarm | |
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
Examples of operations
Set reference temperature
- Push the two buttons simultaneously
- Push one of the buttons and select the new value
- Push both buttons again to conclude the setting
Set one of the other menus
- Push the upper button until a parameter is shown
- Push one of the buttons and find the parameter you want to change
- Push both buttons simultaneously until the parameter value is shown
- Push one of the buttons and select the new value
- Push both buttons again to conclude the setting
| Function | Para- meter | Min. | Max. |
| Normal display | |||
| Shows the temperature at the room sensor | – | °C | |
| Give the lower button a brief push to see the temperature at the defrost sensor | – | °C | |
| Reference | |||
| Set the required room temperature | – | -70°C | 160°C |
| Temperature unit | r05 | °C | °F |
| External contribution to the reference | r06 | -50 K | 50 K |
| Correction of the signal from Sair | r09 | -10,0 K | 10,0 K |
| Correction of the signal from Sdef | r11 | -10,0 K | 10,0 K |
| Start/stop of refrigeration | r12 | OFF | On |
| Alarm | |||
| Upper deviation (above the temperature setting) | A01 | 0 | 50 K |
| Lower deviation (below the temperature setting) | A02 | 0 | 50 K |
| Alarm’s time delay | A03 | 0 | 180 min |
| Defrost | |||
| Defrost method (ELECTRICITY/GAS) | d01 | off | GAS |
| Defrost stop temperature | d02 | 0 | 25°C |
| Max. defrost duration | d04 | 0 | 180 min |
| Drip-off time | d06 | 0 | 20 min |
| Delay for fan start or defrost | d07 | 0 | 20 min |
| Fan start temperature | d08 | -15 | 0°C |
| Fan cut in during defrost (yes/no) | d09 | no | yes |
| Delay for temperature alarm after defrost | d11 | 0 | 199 min |
| Regulating parameters | |||
| Actuator max. temperature | n01 | 41°C | 140°C |
| Actuator min. temperature | n02 | 40°C | 139°C |
| Actuator type (1=CVQ-1 to 5 bar, 2=CVQ 0 to 6 bar, 3=CVQ 1.7 to 8 bar, 4= CVMQ, 5=KVQ) | n03 | 1 | 5 |
| P: Amplification factor Kp | n04 | 0,5 | 20 |
| I: Integration time Tn (600 = off) | n05 | 60 s | 600 s |
| D: Differentiation time Td (0 = off) | n06 | 0 s | 60 s |
| Transient phenomenon 0: Fast cooling 1: Cooling with less underswing 2: Cooling where underswing is unwanted |
n07 |
0 |
2 |
| Start-up time after hotgas defrost | n08 | 5 min | 20 min |
| Miscellaneous | |||
| Controller’s address | o03* | 1 | 60 |
| ON/OFF switch (service-pin message) | o04* | – | – |
| Define input signal of analog input 0: no signal 1: 0 – 10 V 2: 2 – 10 V |
o10 |
0 |
2 |
| Language (0=english, 1=German, 2=French, 3=Danish, 4=Spanish, 5=Italian, 6=Swedish) | 011* | 0 | 6 |
| Set supply voltage frequency | o12 | 50 Hz | 60 Hz |
| Service | |||
| Read temperature at the Sair sensor | u01 | °C | |
| Read regulation reference | u02 | °C | |
| Read valve’s actuator temperature | u04 | °C | |
| Read reference of the valve’s actuator temperature | u05 | °C | |
| Read value of external voltagt signal | u07 | V | |
| Read temperature at the Sdef sensor | u09 | °C | |
| Read status of input DI | u10 | on/off | |
| Read duration of defrost | u11 | m | |
*) This setting will only be possible if a data communication module has been installed in the controller.
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
Start of the controller
When the electric wires have been connected to the controller, the following points have to be attended to before the regulation starts:
- Switch off the external ON/OFF switch that starts and stops the regulation.
- Follow the menu survey and set the various parameters to the required values.
- Switch on the external ON/OFF switch, and the regulation will start.
- If the system has been fitted with a thermostatic expansion valve, it must be set to minimum stable superheating. (If a specific T0 is required for the adjustment of the expansion valve, the two setting values for the actuator temperature (n01 and n02) can be set to the corresponding value while the adjustment of the expansion valve is carried out. Remember to reset the values.
- Follow the actual room temperature on the display. (Use a data collection system, if you like, so that you can follow the temperature performance).
If the temperature fluctuates
When the refrigerating system has been made to work steadily, the controller’s factory-set control parameters should, in most cases ,provide a stable and relatively fast regulating system. If the system on the other hand oscillates, you must register the periods of oscillation and compare them with the set integration time Tn, and then make a couple of adjustments in the indicated parameters.
If the time of oscillation is longer than the integration time: (Tp > Tn, (Tn is, say, 4 minutes))
- Increase Tn to 1.2 times Tp
- Wait until the system is in balance again
- If there is still oscillation, reduce Kp by, say, 20%
- Wait until the system is in balance
- If it continues to oscillate, repeat 3 and 4
If the time of oscillation is shorter than the integration time: (Tp < Tn, (Tn is, say, 4 minutes)
- Reduce Kp by, say, 20% of the scale reading
- Wait until the system is in balance
- If it continues to oscillate, repeat 1 and 2
Frequently Asked Questions
Q: What should I do if there is an error inthe regulation?
A: The three lowermost LEDs will flash when there is an error. You can upload the error code on the display and cancel the alarm by pressing the uppermost button briefly.
Q: How do I start the regulator?
A: Follow these steps:
- Disconnect the external on/off contact that starts and stops regulation.
- Connect the external on/off contact to start regulation.
Q: What should be done in case of temperature fluctuations?
A: Refer to the product manual “EKC 367” for detailed instructions on handling temperature fluctuations.
Documents / Resources
 | Danfoss EKC 367 Media Temperature Controller [pdf] Instruction Manual AN00008642719802-000202, AN00008642719801-000202, AN00008642719801E-0K0C0230627, EKC 367 Media Temperature Controller, EKC 367, Media Temperature Controller, Temperature Controller, Controller |