Danfoss EKE 1A User Manual page 18

Superheat controller and stepper valve driver, Type EKE 1A, 1B, 1C, 1D
[G013 - Signal sharing Pc]
[G014 - Signal sharing S3]
• If two or more sensors are connected to same sharing group, the controller which start up as the rst one will
broadcast the signal.
• If the receiving controllers has not received a shared signal from another controller for 3 seconds (parameter G003
CAN bus min update interval) it will start broadcast the local sensor.
• When more controllers are connected via CANBus each end of the bus must be terminated with a jumper between
CANH and R120
 NOTE:
Broadcasting is not possible via Modbus. In case of Sensor error, broadcast will stop.
Only EKEs from the same group address can share signals
• Group 1 address 1 to 31
• Group 2 address 32 to 63
• Group 3 address 64 to 95
• Group 4 address 96 to 125
A controller knows its own address and knows from which address the broadcast is coming, this information is used
to discard broadcast signals for controllers outside own group.
Address 0 is invalid, Address 126 and 127 are reserved for remote displays.
Figure 16: 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 de ned 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 con guration registers i.e "I040 = 5" and "I044 = 8" respectively.
© Danfoss | Climate Solutions | 2024.08
EKE 1C EKE 1C
Jumper
BC398828796060en-000103 | 18