Danfoss EKE 1C User Manual

Stop
Fixed OD
Use Average OD
Table 39: Thermostat Failsafe mode
Thermostat Failsafe mode
Description
Thermostat sensor error.
Thermostat operation needs the signal selected in [R015 Sensor select] to oper-
ate the thermostat function, if this signal fails operation based on actual tempera-
ture is not possible
User can via parameter [N144] Thermostat sensor error action] congure the rel-
evant option.
valve forced closed, SH control and Temperature control (default)
valve at xed position (Fail safe OD). This Keeps the refrigeration
running
Cutin /cutout use average on and o time to continue cool-
ing
MTR use reduced OD based average OD (70% of average
OD).
Table 40: Thermostat Failsafe mode parameters
Parameter
Function
Description
N144
Thermostat sensor error action
0 = Stop | 1 = Fixed OD | 2 = Average OD
N145 [only if N144= 1]
Fixed OD during emergency cooling
Dene xed OD % during Emergency cooling
N138 [only if N144= 2]
Average OD
Calculated When superheat control/ Temperature control is ac-
tive and stored in EEPROM. Its value is updated every 3 hours.
Reset to factory will not delete the calculated average values.
Used in average OD
Superheat close
SH close ensures that superheat is on or above ‘SH close set point to avoid liquid getting back to the compressor. If
the media inlet temperature drops or if compressor goes down in capacity, the superheat may drop below the SH
close setpoint, then the ow in the expansion valve is reduced to bring superheat up to SH close setpoint as shown
in the gure below.
Figure 78: SH close operation
Compressor capacity
OD
Superheat
SH close is active
reducing OD fast
to get SH back to
reference
Time
Superheat
SH Ref
SH close
setpoint
Auto SH control
Auto SH control
Danfoss 80G357.10
Table 41: Superheat close Parameters
Parameter
Function
Description
N117
SH close function
0 =
O | 1 = On, default Valve = On
N119
SH close setpoint
Default value =2 K
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.
Superheat controller, Type EKE 1A, 1B, 1C, 1D
© Danfoss | Climate Solutions | 2022.06 BC398828796060en-000101 | 54

Danfoss EKE 1C Specifications

General

Brand	Danfoss
Model	EKE 1C
Category	Controller
Language	English