Danfoss EKE 1A User Manual page 41

Superheat controller and stepper valve driver, Type EKE 1A, 1B, 1C, 1D
6.1.2 Driver Mode using Communication Bus
Driver Mode using Communication Bus
The opening degree of a stepper valve can be operated manually between 0% and 100% OD via communication
bus.
Table 20: Driver Mode using Communication Bus
Parameter Function
RI02 Operation mode
I091 Driver reference con guration for 1B
I033 Driver reference con guration for 1C
O045 Manual OD
B100 Manual step
X004 Modbus main switch
X002 Modbus preset OD
6.2 Superheat Control Mode
In this section some important parameters for SH control mode and other sub modes are described.
For basic superheat control, one temperature sensor S2, and one pressure sensor Pe are needed. The actual
superheat is calculated based on these two sensor readings, and the controller will adjust the OD of the valve to
bring the superheat to the desired reference. If superheat is too low the ow in the expansion is decreased and
superheat will be higher and vice versa. For advanced SH control the use of additional temperature and pressure
sensors are needed.
Figure 55: EKE as SH controller
EKE 1X
EEV
Table 21: Super Heat Control Parameters
Parameter Function
Reference
R012 Main switch
R102 Operation mode
R014 Thermostatic Mode
© Danfoss | Climate Solutions | 2024.08
Pe
S2
Selector
On
SH control
0-Not Used
1-Cut-in/cut-out mode
2-MTR modulating thermostat
mode.
Description
Mode selection, select 1 to operate as valve driver
1 = valve Driver,
Select reference con guration,
1- Modbus to OD| the controller receives opening degrees from
the bus
2- Modbus to steps| the controller receives opening degrees
from the bus
1 = Bus to OD|
2 = Bus to step
Set the desired OD in percent
Set the desired OD in number of steps
1 = ON, 0 = OFF
1 = ON, 0 = OFF
Description
• The software main switch is used to start / or stop refrigerating
• The hardware main switch (DI) can be used also.
• If the main switch is on changes are not allowed.
Selected to use EKE in the superheat control mode
If you select Not used, only superheat is regulated regardless of the me-
dia temperature.
BC398828796060en-000103 | 41