Other Features And Modes; Startup And Defrost Modes - Danfoss EKE 1A User Manual

Superheat controller, Type EKE 1A, 1B, 1C, 1D
Table 33: Compressor feed Forward
Parameter Function
N135 Comp. speed feed forward function
R100 Compressor Capacity
N136 FF low capacity turning point
N137 FF maximum factor for Tn turning

6.3 Other features and modes

6.3.1 Startup and Defrost Modes

A Startup mode allows the valve to open faster on start-up to avoid any unwanted low-pressure situation. EKE 1x
controllers implements 3 different modes for startup, and one sequence for startup.
Figure 72: Startup and Defrost Modes
EKE 1A
Applicable
P-control
The controller is programmed for auto proportional control that will quickly Change the opening degree based on
the superheat of the system. The proportional control is active during the Minimum start time set by the user, and
until the Super heat crosses the reference.
 WARNING:
If SH didn't cross the Superheat reference after the minimum stop time(N104), the Proportional control will stop
after the start time(N105), set by the user.
Figure 73: proportional control startup mode
SH
Min startup
time
The Pctrl is active in
the min start time and
SH ref
The parameters to setup this mode is illustrated in the following table:
© Danfoss | Climate Solutions | 2022.06
1B 1C 1D
Start time
until SH cross the
reference
SH crosses the SH
reference after the "min
start time" = > the
proportional control id
disabled after that
Description
0 = Off | 1 = On, default Off
compressor capacity value in percentage via Modbus
The point where SH control is starting to slow. Below this speed
superheat control is slower
Define max. reference current
BC398828796060en-000101 | 50