Configuration - Danfoss EIM 365 User Manual

Superheat controller, type EIM 365 (PV01)

Configuration

This section represents a guide on how to configure the EIM 365 series controller for various application. Also, the
configuration for other features, like startup, defrost and protection are also explained. The parameters are given in
a form of a parameter table, where the most important parameters in a mode are shown and described.
The EIM 365 controller has a default configuration 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).
The following control modes are available:
• Superheat control
• Manual Control
• Defrost
• Te Control for dehumidifying
• Protection features
Superheat Control Mode
For 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 flow in the expansion is decreased and superheat will
be higher and vice versa
Table 6: Quick Guide for setting the controller in Superheat control mode
Features
EnablingRegulation control ON/Off switch (optional)
Select Refrigerant
Select startup method
Select superheat reference calculation method
Select valve setting
Define pressure sensor rangein bar absolute (x10)
Define min/max superheat
Define MOP (optional)
Set force opening of the valve (optional)
To start the superheat control
 NOTE:
Make sure that r12 = 0 (OFF) for changing the settings.
Configuring the superheat control
The superheat controller is a PI controller, The time constant for the superheat control can be changed by setting
"Tn SH".The alpha value is the design time constant and should be in reasonable proximity to the time constant of
theevaporator. A large alpha value means a slow reaction, a small alpha value means a fast reaction.If the superheat
drops below "n22 SH close", the controller will close the valve faster to avoid the risk of liquid in the compressors
suction line.
In superheat mode the controller will control the superheat to be stable and closer to the superheat reference. The
Superheat reference is calculated based on following different methods:
© Danfoss | Climate Solutions | 2022.09
Description
HwMainSwitch= 1 (default is 0, i.e S4 sensor)
Forstandalone configuration it is recommended to enable Regulation control
ON/Off switch in order to control start/ stop regulation when needed, otherwise
the controller will start regulating when controller is powered up.
O30= 1 - 42 (default value is 20 i.e R407C)
Startup mode:
1: fixed OD, 2: P-control
n21 SH mode:
1: MSS; 2: LoadAp
Note: EIM can be set to Fixed SH mode by using LoadAp and setting Max SH =
Min SH
n03=Valve type
o20 = Min. Transducerpressure
o21 =Max.Transducer pressure
N09= max. superheat
n10= min. superheat
n11= maximum operating pressure (default is 12.5 bar absolute, max. 200 = MOP
off)
Start OD% (n17 )Start Up time (n15)
Set r12= ON
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