Danfoss EKE 1A User Manual page 55

Superheat controller and stepper valve driver, Type EKE 1A, 1B, 1C, 1D
Figure 69: SH close operation
Superheat
Auto SH control
SH Ref
SH close
setpoint
Table 48: Superheat close Parameters
Parameter Function
N117 SH close function
N119 SH close setpoint
Lowest Operating Pressure (LOP)
Lowest Operating Pressure (LOP) will make sure that the evaporating pressure (Pe) is kept above LOP set point, this
will prevent the compressor from stopping due to low suction pressure. If the pressure comes below this limit the
controller will quickly open the valve.
Figure 70: Lowest Operating
Compressor
start
Outdoor
temp
Lop setpoint
Table 49: Lowest Operating Pressure (LOP) Parameters
Parameter
N140
N141
N142
N131
© Danfoss | Climate Solutions | 2024.08
SH close is active
reducing OD fast
Auto SH control
to get SH back to
reference
Compressor capacity
Valve is opening to
avoid Te going lower
Te evaporator temperature
OD
Superheat
Function
LOP function
LOP setpoint °C
LOP priority mode
LOP max. time
Superheat
OD
Time
Description
0 = O | 1 = On, default Valve = On
Default value =2 K
Description
0 = O | 1 = On, default Valve = O
Lowest Operating Pressure setpoint.
Setpoint unit is saturated temperature in evaporator
In case of con ict between low pressure and SH close, LOP function can be set to
override SH close actions. (Could be needed for startup in low ambient tempera-
tures)
On: LOP can override low superheat
0 = O | 1 = On, default= Of
 WARNING:
As default, controller will not be allowed to open the valve when the superheat is
low. If such feature is needed for a short time, parameter" N142 LOP priority
mode" can be set to ON. This will allow LOP to have higher priority than bringing
the superheat out of low superheat for the time de ned in" N131 LOP max. time".
 WARNING:
A specialCare should be taking that compressor can handle this condition.
Maximum time for LOP to override SH close
BC398828796060en-000103 | 55