Danfoss EKE 1A User Manual page 53

Superheat controller and stepper valve driver, Type EKE 1A, 1B, 1C, 1D
The user sets the Defrost OD, the Defrost end OD, defrost start and end time (see table below).
The defrost start/end commands are received from one of the following options:
1. Modbus register (nonvolatile memory) – default OFF at power-up
2. DI's for use as defrost start/stop. Only one DI can be assigned for defrost start/stop. Start is de ned as a transition
from o to on, a transition from on to o is a stop signal.
Table 43: Defrost Sequence parameters
Parameter
D101
D102
D100
D104
D103
D105
6.3.2 Protection features
EKE 1x series has protection features that prevents the system from operating under bad conditions, these
protection features are:
• Fail safe operation
• Superheat close
• LOP (Low operating pressure)
• MOP (Maximum operating pressure)
• HCTP (High condensing temperature protection)
• Min. S4 (Minimum S4 temperature)
Figure 68: Protection features (limiters)
HCTP
MOP
LOP
© Danfoss | Climate Solutions | 2024.08
Function
Defrost start low pressure limit
Defrost start time
Defrost OD
Defrost end closed time
Defrost end OD time
Defrost end OD
Superheat
close
Superheat
reference
Enthalpy (H)
Description
The defrost sequence starts by closing
the valve, which is kept closed until the
'D101 Defrost start low pressure limit' is
reached or D102 'Defrost start time' is
exceeded.
 WARNING:
This parameter is valid only if the de-
frost start time >0
The defrost sequence starts by closing
the valve, which is kept closed until the
'D102 'Defrost start time' is exceeded or
'D101 Defrost start low pressure limit' is
reached
Sets the valve opening degree after the
Defrost start time is passed.
After the defrost stop signal, the valve
closes and will open again after 'Defrost
end closed time' is exceeded
End of the defrost, start of the startup
mode.
Sets the valve opening degree after De-
frost end closed time.
Default
1.0 brag
0 s
0%
1s
1s
50%
BC398828796060en-000103 | 53