Superheat Reference Calculation Parameters - Danfoss EKE 1A User Manual

Superheat controller, Type EKE 1A, 1B, 1C, 1D
Parameter Function
Pe transmitter
I086
configuration
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
different methods:
• Fixed Superheat reference
• MSS
• Load AP
• Delta Temperature Reference
Fixed Reference
In this method, the EKE tries to keep the superheat at a fixed value determined by the user. SH fixed setpoint can be
varied according to the need of application.
Figure 58: Fixed reference
EKE 1A
Applicable
Table 24: Fixed superheat parameters
Parameter Function
R102 Operation mode
N021 SH reference mode
N107 SH fixed setpoint
N117 SH close Function
© Danfoss | Climate Solutions | 2022.06
Selector
Select based on the supported
pressure sensors
Select from variety of refrigerants.
0-Prop.cntrl
1-Fix OD with protection
2-fix 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
1B 1C 1D
Selection of the used pressure sensor.
User defined refrigerant is possible by Selecting R user and define 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-
To limit the maximum OD of an oversized valve used in the system. This
maximum OD % can be set to lower value if required.
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 fixed value defined 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 fixed value defined by parameter N145
▪ Cutin /cutout use average on and off time to continue cool-
◦ MTR use reduced OD based average OD (70% of average OD).
Description
0 = SH Control
0 = Fixed Superheat
The fixed superheat reference defined by the user.
Safety feature to prevent the flooding of the liquid into the compressor.
When the measured superheat goes bellow the SH close setpoint (parameter
N119)
0 = Off | 1 = On, default = 1
Description
tion.
Default: 0%
Default: 100%
• Average:
◦
ing.
BC398828796060en-000101 | 42