Danfoss EKE 1C User Manual

ID
Symptom
Possible cause/Reaction
Solution
11
Superheat outside the de-
ned range or does not
reached the setpoint
Wrong valve selected or its valve parameter.
• Check the right valve type and its setting.
Loss of refrigerant in the system.
• Charge the system with appropriate refrigerant capaci-
ty.
• Check for leakage in the system.
Expansion valve too small.
• Replace with larger valve if necessary.
• Check the selected valve in the controller valve list.
Step loss in the valve.
• Drive the stepper valve with the recommended Speed.
• Too high or too low speed could result in loss step in
the valve.
• For the user dened valves, check the other valve set-
tings such as current, duty cycle, holding current and
another relevant parameter.
• Use overdrive features to mitigate the loss steps. Use
the correct overdriving values with respect to the used
value.
• Wrong dened valve type or its setting.
• Longer cables mounted than specied for the control-
ler.
• Separate Valve cable from other high-power cables and
do not bundle the cables.
• Obstruction in the valve or high friction in the valve.
• MOPD exceeded than specied in the valve specica-
tion.
12
Takes too long to settle SH
at reference point
Too low gain Kp and KpTe or long integration time Tn.
• Increase Kp by factor of 1.5%
• Decrease Tn 25% of the set value
• Perform 1 and 2 in a loop if needed.
At start up. the pull-down time for SH or temp is longer.
• Use start with P. control and increase start OD.
• If the superheat in general is 4K higher than reference 1
minute alter start up. the startup OD can be adjusted to
be 20 % higher.
Wrong selection of the valve.
• Check the valve type and in setting.
Wrong selection of the reference point.
• Correctly dene the min, max SH setting and/or refer-
ence type i.e MSS/Load dened ap / Fixed/delta Temp.
• Also check section, High superheat and ‘Too high and
too low superheat’
13
Startup problem
low pressure cut out at start up
• Check the LEO Alarm connection.
• Missing synchronization with controller and the com-
pressor Le. D4 not connected to EKE.
• Wrong Of missing valve connection. Check the M12 ca-
ble connection to the valve and to the controller.
• Check other component in the suctions liquid 'Meta
any keel of blockage.
•
Use the LOP feature during start up.
Unsynchronized signals.
• Make sure that main switch signal and the compressor
start are synchrony, it ok to have until 2 sec delay.
High Superheat after startup.
• Check section Too high or too low superheat.
14
Startup problem after de-
frost
low suction cut out
• Use EKE defrost sequence feature.
• Use LOP feature
• Use P- control at start method and prolong the start
tine
• Check the right signal from the controller.
15
Unable to maintain media
temperature
Lack of sub-cooling ahead of expansion valve
• Limit max opening degree of the valve setting in con-
troller.
• Check refrigeration system capacity and compare with
expansion valve capacity. Use proper valve size suitable
for the system.
Check section High superheat and Low suction Pressure
Wrong selection of temperature sensor and or installation.
• Check for the right sensor conguration
Check Working condition of the unit
• Check Superheat.
Superheat controller, Type EKE 1A, 1B, 1C, 1D
© Danfoss | Climate Solutions | 2022.06 BC398828796060en-000101 | 78

Danfoss EKE 1C Specifications

General

Brand	Danfoss
Model	EKE 1C
Category	Controller
Language	English