Inhaltsverzeichnis
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Control parameters
P: Amplification factor Kp
If the Kp value is reduced the regulation becomes slower.
I: Integration time Tn
If the Tn value is increased the regulation becomes slower
D: Differentiation time Td
The D-setting can be cancelled by setting the value to min. (0).)
Max. value for the superheat reference
Min. value for the superheat reference
Warning! Due to the risk of liquid flow the setting should not be lower than approx. 2-4 K.
MOP
If no MOP function is required, select pos. Off.
AKV valve's time period in seconds
Should only be set to a lower value if it is a decentralised plant and the suction pres- sure fluctuates a lot
and in line with the opening of the AKV valve.
Stability factor for regulation of superheat
With a higher value the control function will allow a greater fluctuation of the super- heat before the
reference is changed. The value should only be changed by specially trained staff.
Damping of amplification near reference value
This setting damps the normal amplification Kp, but only just around the reference value. A setting of 0.5
will reduce the KP value by half.
The value should only be changed by specially trained staff.
Amplification factor for the superheat (only in 1:1 plant)
This setting determines the ICM or AKV valve's opening degree as a function of the change in
evaporating pressure. An increase of the evaporating pressure will result in a reduced opening degree.
When there is a drop-out on the low-pressure thermostat during start-up the value must be raised a bit.
If there is pendling during start-up the value must be reduced a little.
The value should only be changed by specially trained staff.
Definition of superheat regulation (Ref. appendix 6)
1: Lowest permissible superheat (MSS). Adaptive regulation.
2: Load-defined superheat. The reference is established based on the line formed by the three points:
n09, n10 and n22.
Value of min. superheat reference for loads under 10%
(The value must be smaller than "n10").
Standby temperature when valve closed (TQ only)
The TQ actuator is kept warm when the valve reaches its closing point. As the closing point cannot be
defined completely accurately due to tolerances and pressure varia- tions, the setting can be changed,
as required (how "tightly"/securely the valve is to close). See also appendices 1 and 5.
Standby temperature when valve open (TQ only)
The TQ actuator's temperature is kept low when the valve reaches its fully open posi- tion. Here you set
how many degrees the temperature is to be above the expected open temperature in completely open
position. The greater the value, the surer it
is that the valve will be open, but it will also react more slowly when it has to close again.
Max. opening degree
The ICM or AKV valve's opening degree can be limited. The value is set in %. The value should
only be changed by specially trained staff.
Min. opening degree
The ICM or AKV valve's opening degree can be set to a specified min. value, disabling full closure.
The value should only be changed by specially trained staff.
© Danfoss | DCS (ADAP-KOOL®) | 2015-03
User Guide | Superheat controller, EKC 315A
a
n04
Kp factor
n05
Tn sec.
n06
Td sec.
n09
Max SH
n10
Min SH
n11
MOP (Bar)
(A value of 60 bar corresponds to Off)
n13
AKV per. time
n18
Stability
n19
Kp Min
n20
Kp T0
n21
SH mode
n22
SH Close
n26
TQ Kmin
n27
TQ Kmax
n32
OD Max
n33
OD Min
DKRCI.PS.RP0.D2.02 | 520H7653| 5
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