Danfoss EKE 1A User Manual

ID
Symptom
Possible cause/Reaction
Solution
16
Flash gas
Loud refrigerant or undercharged refrigerant.
• Charge the system with appropriate refrigerant capaci-
ty.
• Check for leakage is the system.
• If the valve is placed much higher than condenser
tweet check pressure dierence.
Flash gas can lead to high SH or low suction pressure
• Use the right valve size.
• Also refer to section “High Superheat” and “Suction
pressure too low”
Pressure drops across lter.
• Check and replace the Stet.
17
Steppe valves open/ close
too slow
Incorrect selection of valve type.
• Dane the correct valve type.
Incorrect valve installation.
• Check the physical vale and cable and intake in light
way.
MOPD is higher than valve specication.
• Check the valve spec and choose the correct vane.
Check valve speed setting.
• 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
other relevant parameter.
18
Opening degree of valve at
maximum OD for longer
time period
Lack of cooling capacity.
• Check the cooling capacity in the system Also check
section, expansion valve too small
The condenser pressure is too low.
• Check the ambient temperature.
• Adjust the condenser controller.
The lter drier is blocked by dirt
• Replacement Filter drier.
Flash gas in liquid line due to loss of refrigerant or under-
charge of refrigerant.
• Check section ash gas.
Wrong valve setting.
• Check valor setting matching installed valve.
Pressure transmitter is wrongly dened.
• Oita pressure range and correct pressure transmitter
type.
Wrong refrigerant selected
• Choose the correct refrigerant in the controller.
19
Hunting or uctuation valve
position
Too high gain (Kp and KpTe) or too low integration time
(Tn).
• Decrease Kp by factor of 1.5%
• Increase Tn 25% of the set value.
• Perform 1 and 2 in loop if needed.
S2 thermal contact.
• Check mounting of S2 sensor, Check the installation
guide section temperature sensor mounting.
Fluctuating Al signal for SH reference.
• Check Al signal quality.
Fluctuating pressure signal.
• Check section Fluctuating pressure signal.
Fluctuating Superheat.
• Check section Fluctuating Superheat.
20
Unstable OD on driving the
valve in Valve driver mode
Fluctuating Al signal.
• Check the Al signal quality.
• Use the Valve neutral zone feature.
21
Internal Leakage in the valve
Wrong selection of the valve.
• Check the valve type and its setting.
Step loss in stepper motor valve.
• Power cycle the controller.
• Enable the step loss feature i.e. overdriving. choose the
recommended overdrive value with respect to the in-
stalled valve.
• Drive the stepper valve with the recommended speed.
• Too high or too low speed could result in loss step in
the valve.
• Longer cables mounted than specied for the control-
ler.
• Separate Valve cable from other high-power cables and
do not bundle the cables.
• Blockage in the valve or high friction in the valve.
• MOM, exceeded than specied in the valve specica-
tion.
© Danfoss | Climate Solutions | 2022.06 BC398828796060en-000101 | 79
Superheat controller, Type EKE 1A, 1B, 1C, 1D

Danfoss EKE 1A Specifications

General

Brand	Danfoss
Model	EKE 1A
Category	Controller
Language	English