Danfoss EKE 1A User Manual page 42

Superheat controller and stepper valve driver, Type EKE 1A, 1B, 1C, 1D
Parameter Function
Temperature
R009 Sensor S2
correction
Pressure sensor
R107
Pe correction
Sensor con guration
S2 sensor
I082
con guration
Pe transmitter
I086
con guration
Control Basic
O030 Refrigerant
N102 Startup mode
N021 SH Reference Mode
I066 Minimum OD
N032 Maximum OD
Control Advanced
SH control sensor
N143
error action
Thermostatic
N144 sensor error
action
6.2.1 Superheat Reference Calculation Parameters
As mentioned in the previous section, in superheat mode the controller will control the superheat to be stable and
closer to the superheat reference. The Superheat reference is determined and calculated based on following
di erent methods:
• Fixed Superheat reference
• MSS
• Load AP
• Delta Temperature Reference
Fixed Superheat reference
In this method, the EKE tries to keep the superheat at a xed value determined by the user. SH xed setpoint can be
varied according to the need of application.
Table 22: Fixed Superheat reference
EKE
Applicable
© Danfoss | Climate Solutions | 2024.08
Selector
De ned by the user in K
De ned by the user in Brag
Select based on the supported
temperature sensors
Select based on the supported
pressure sensors
Select from variety of refrigerants.
0-Prop.cntrl
1-Fix OD with protection
2- x OD without protection
0-Fixed step
1-Loadap
2-MSS
3-DeltaTemp
0-Stop
1- Fixed OD
2-Average
0-Stop
1- Fixed OD
2-Average
1A 1B
Description
Correction value for temperature sensor. This value is de ned by the
user.
Correction value for pressure sensor. This value is de ned by the user.
Selection of the used temperature sensor.
Selection of the used pressure sensor.
User de ned refrigerant is possible by Selecting R user and de ne An-
toine constants A1, A2, A3
This feature is used when it is necessary to open the valve Quickly when
the compressor turns on, to prevent too low suction pressure
Used to choose how the superheat reference is calculated
The valve minimum OD can be set to a required minimum opening posi-
tion.
Default: 0%
To limit the maximum OD of an oversized valve used in the system. This
maximum OD % can be set to lower value if required.
Default: 100%
If SH control sensor S2, S3*, Pe has an error, then an action can be set
top position the valve OD.
• Stop: Close the valve and SH control.
• Fixed OD: set OD to a xed value de ned by parameter N145
• Average OD: set OD to be the average OD for the last hour.
*only in delta-temp operation
If a thermostatic sensor error as happened (S3 and S4) has an error.
• Stop: Close the valve and SH control.
• Fixed OD: set OD to a xed value de ned by parameter N145
• Average:
◦
▪ Cutin /cutout use average on and o time to continue cool-
ing.
◦ MTR use reduced OD based average OD (70% of average OD).
1C
BC398828796060en-000103 | 42
1D