Danfoss EKE 1A User Manual page 19

Superheat controller, Type EKE 1A, 1B, 1C, 1D
Figure 17: Sensor Signal sharing
Temperature
sensor
Pressure
transmitter
EKE 1C
CAN
Jumper
Receiving Sensor Signal via Modbus:EKE 1B/1C controllers can receive the external sensor values like Po, Pc, S2, S3
and S4 via Modbus. In some applications, the suction pressure and/or the refrigerant temperature on the evaporator
outlet, is measured by a system controller. In these cases, the sensors can be omitted from EKE, and the sensor
values can be received via Modbus instead. This requires that the systems main controller continuously transmits
these values to EKE, If no new sensor value is received within defined Modbus time interval in seconds i.e. G004 of
the last transmission, the EKE will raise sensor alarm which will stop the regulation.
Example: The suction gas temperature S2 and the evaporator pressure Pe can be set by activating bus shared
sensor configuration registers i.e "I040 = 5" and "I044 = 8" respectively.
Figure 18: Receiving signal via Modbus
RS485 MODbus
Sensor values
EKE controller
Pressure transmitter
© Danfoss | Climate Solutions | 2022.06
EKE 1C
Jumper
Master controller
Temperature sensor
EKE 1C
BC398828796060en-000101 | 19