Sharing Input Signal; Sharing Pressure Sensor Signal - Danfoss EKE 1A User Manual

Superheat controller, Type EKE 1A, 1B, 1C, 1D
Danfoss recommends using EKE 2U as the preferred battery backup device, for more details check the EKE 2U
datasheet. The battery backup device power rating Watt/VA must match the valves requirements
 NOTE:
• The power supply terminals must be connected at every Unit.
• The battery voltage must not be connected from main power supply connected to EKE.
• A battery voltage lower than 16.5 V and higher than 27V will trigger the battery alarm.
• It is not allowed to shared AC power supply and DC backup battery simultaneously with multiple controllers.
• EKE 2U can only support a maximum of two valves for emergency closing, or only one valve in case the valve used
consumes higher power. See EKE 2U documents for more details.

3.7.2 Sharing input signal

The EKE cannot share digital inputs.The digital inputs (voltage free Contacts) cannot share the same signal directly
or be connected to external power supply.To share a digital signal between multiple digital inputs, a special circuitry
is needed. For example, Each DI can be provided with its own relay (or optocoupler) that must withstand 100mA
impulses at15V. EKE 1 series (Except 1C) can share analog input between multiple controllers
Figure 15: Possible circuitry to share a digital signal between Multiple
EKE
Danfoss
80G340.10
D1
COM
EKE
D1
COM
EKE
D1
COM
EKE

3.7.3 Sharing pressure sensor signal

For EKE 1A, EKE 1B, EKE 1D up to 5 controllers can share one Ratiometric pressure transmitter readings. To get a
correct acquisition on all the units all the three wires (GND, 5V and transmitter signal, output) must be routed to
every unit
© Danfoss | Climate Solutions | 2022.06
Power supply
– +
Relay
Relay
R
Optocoupler
PLC
D0
BC398828796060en-000101 | 17