Applications
Superheat control
For superheat control, EIM implements a PI controller. The actual superheat is calculated based on temperature
sensor S2 and pressure sensor Pe values, and the controller will adjust the OD of the valve to bring the superheat to
the desired reference. If superheat is too low the flow in the expansion is decreased and superheat will be higher
and vice versa.
The EIM 365 controller is designed to be operated via Modbus and to rely on a constant connection to the master
controller of the system it is located within. In this configuration the master controller reads the readout registers
from the EIM 365 and uses the parameters to change the control behavior of the EIM 365 (see parameter list).
Figure 5: Superheat control
Evaporator temperature (Te) control for de-humidifying
For applications with a need to de-humidify the evaporator, it is possible to control on the saturated evaporator
temperature instead of the normal control signal.
Manual control (Stepper driver via Modbus)
In this application the EIM 365 is a stepper motor driver, where the valve can be controlled manually by setting the
desired opening degree via Modbus.
Superheat controller, type EIM 365 (PV01)
© Danfoss | Climate Solutions | 2022.09
BC415322248492en-000101 | 10