Product Overview

© Danfoss | DCS | 2019.04
Data sheet | Superheat controller type EKE 1A, EKE 1B, EKE 1C
DKRCC.PD.RS0.A4.02 | 69
ID Symptom Possible cause / Reaction Solution
18 Hunting or uctuation
valve position
Too high gain (Kp and KpTe) or too low
integration time (Tn).
• 1.Decrease Kp by factor of 1.5.
• 2. 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 AI signal for SH reference. • Check AI signal quality.
Fluctuating pressure signal. • Check section Fluctuating pressure signal.
Fluctuating Superheat. • Check section Fluctuating Superheat.
19 Unstable OD on driving
the valve in Valve driver
mode
Fluctuating AI signal. • Check the AI signal quality.
• Use the Valve neutral zone feature.
20 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 installed 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 controller.
• Separate Valve cable from other high power cables and do not
bundle the cables.
• Blockage in the valve or high friction in the valve.
• MOPD exceeded than specied in the valve specication.
21 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. • Check proper and rm connection of valve cable wires to EKE
terminals.
• Also check section ‘valve rotates in opposite direction’.
Change in valve setting or other
congurations.
• Check for the correct valve parameters.
• Check for the correct state of r12 ON/OFF regulation or DI
connection.
• IF AI or Modbus signal is used, make sure that the correct signal
is connected to the controller.
Incorrect voltage supplies to the controller. • Check the power supply and measure input voltage to the controller.
Valve got stuck. • Check the valve installation.
• Check for the dirt inside the valve.
Valve motor is damaged; resistance of the
motor varies a lot than specied for a valve.
• Check the resistance in the motor between each coil.
• Make sure you consider some tolerances for cable or temperature
deviation.
• Replace a valve.
22 Valve rotates in opposite
direction
Valve M12 cable wire is wrongly connected to
the controller.
• Check the connection of wire color codes as stated in Installation
guide.
• For other valves than Danfoss, check with valve supplier for the
right connection.
Wrong connection of wires at cable joint, if there
is extension cable to the main Valve cable.
• Check for the right color conguration at the joint.
23 Valve is overdriven to
Zero position
EKE performs valve calibration in the
following situation as a normal procedure.
• Normal operation
a. on dening a valve type.
b. Valve overdrive feature is enabled and
OD is closed to fully closed positon or the
overdriving timer is ON.
c. Alarm or Error condition will bring the
valve to Zero position and stop regulation
d. on setting DI = O when DI is set as
ON/OFF regulation