Danfoss EKE 1A User Manual page 43

Superheat controller and stepper valve driver, Type EKE 1A, 1B, 1C, 1D
Table 23: Fixed superheat parameters
Parameter Function
R102 Operation mode
N021 SH reference mode
N107 SH xed setpoint
N117 SH close Function
N119 SH close setpoint
I082 S2 sensor con guration
I086 Pe transmitter con guration
Minimum Stable Superheat (MSS)
The controller will be searching for the minimum stable superheat between an upper and lower boundary speci ed
by the user. Then if the superheat is stable at a certain value, the controller decreases the superheat reference, if the
SH gets unstable, the SH reference is raised again.
The goal of this method is to search for the lowest possible superheat that can be obtained while still maintaining a
stable system.
Table 24: Minimum Stable Superheat (MSS)
EKE
Applicable
Figure 56: Minimum stable Superheat
Q
o
100 %
40 %
10 %
Min. SH
Table 25: MSS parameters
Parameter Function
R102 Operation mode
N021 SH reference mode
N009 SH max. value
N010 SH min. value
N018 MSS Stability
T0 variant factor (Value from 0 to
N129
1)
© Danfoss | Climate Solutions | 2024.08
1A 1B
Danfoss MSS
Superheat
Max. SH
Description
0 = SH Control
2 = MSS
Maximum allowed SH reference in the range.
Minimum allowed SH reference in the range.
The amount of allowed uctuation in the superheat before the reference is changed (the range at which the SH
is considered stable)
De nes how Pressure variation (From Pe) in uence the SH reference.
Description
0 = SH Control
0 = Fixed Superheat
The xed superheat reference de ned by the user.
Safety feature to prevent the ooding of the liquid into the compressor.
When the measured superheat goes bellow the SH close setpoint (parameter
N119)
0 = O | 1 = On, default = 1
It is recommended to set the SH close setpoint 2k below the minimum SH.
Default value =2 K (recommended).
-Selection of the used evaporator temperature sensor S2
-Selection of the used evaporator pressure sensor Po
1C 1D
BC398828796060en-000103 | 43