Danfoss EKE 1C User Manual

Stop
Fixed OD
Use average OD
• Fail safe operation
• Superheat close
• LOP (Low operating pressure)
• MOP (Maximum operating pressure)
• HCTP (High condensing temperature protection)
• Min. S4 (Minimum S4 temperature)
Figure 77: Protection features (limiters)
Danf
oss
80G8227.01
Pressure (P)
HCTP
MOP
LOP
Superheat
reference
Superheat
close
Enthalpy (H)
Fail Safe Operation
In the case of sensor error, the EEV controller will go into an emergency mode (“safe mode”). where the valve
opening degree is dened by desired OD scheme as described below
User can read the failure status via [U118 Operation status].
EKE 1x implements two Failsafe mode:
• SH control Failsafe mode
• Thermostat Failsafe mode
Table 37: SH control Failsafe mode
SH control Failsafe mode:
Description
SH control needs Pe and S2 signal. so, if one of these
signal fails, SH control based on the actual superheat
is not possible.
User can via parameter [
N143] SH control sensor error action, under control advanced. congure the relevant
option
valve forced closed and SH control (default)
valve at xed position (Fail safe OD), this keeps the refrigeration unit running
(calculated as an average of the last hour) to set a reduced OD which will be xed dur-
ing error period. This keeps the refrigeration unit running
Table 38: SH control Failsafe mode parameters
Parameter
Function
Description
N143
SH control sensor error
0 = Stop | 1 = Fixed OD | 2 = Average OD
N145 [only if N143= 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 active 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
© Danfoss | Climate Solutions | 2022.06 BC398828796060en-000101 | 53
Superheat controller, Type EKE 1A, 1B, 1C, 1D

Danfoss EKE 1C Specifications

General

Brand	Danfoss
Model	EKE 1C
Category	Controller
Language	English