Product Overview

© Danfoss | DCS | 2019.04
Data sheet | Superheat controller type EKE 1A, EKE 1B, EKE 1C
DKRCC.PD.RS0.A4.02 | 61
When an alarm occurs, the following actions generally ensue:
the “Alarm or “Warning relay is activated
an icon and the alarm code is displayed on the screen
On units with an LCD display, the list of active alarms appears with the relative description
The alarms are reset automatically. The alarm is deactivated as soon as the alarm condition
ceases. Otherwise the user must follow the deactivation procedure once the alarm conditions
is over.
When the alarm is eliminated the alarm relay is deactivated and the alarm code will no longer
be displayed.
25.0 Alarms
25.1 Actions following an
alarm
(A)
(B)
(A) Two status LEDs to indicate operational status
Steady green = power ON
Flashing green = data transmission / initialization
Flickering red = alarm / error condition
(B) Two status LEDs to indicate valve operation
Flashing red = valve closing
Steady red = valve fully closed
Flashing green = valve opening
Steady green = valve fully open
Both green and red ashing = valve-related alarm
Lack of Valve Capacity
Lack for capacity alarm can be used to get early warnings relating to a blocked condenser, a leak in the
system or under sizing of the injection valve. The valve could also be stuck at low OD. It is considered
abnormal, that the system needs to run at maximum OD for a long time.
A Lack of capacity alarm is generated if OD is above maximum OD -5% in 90% of the monitoring
window operation. The alarm becomes inactive and the timer resets, when OD is below maximum OD
-5% in 88% of monitoring window, or when control is OFF.
Note: This alarm is also active in the Hot Gas bypass application.
Parameter Function Description
A112 Lack of capacity alarm delay, in
minutes
Length of monitoring window for Lack of capacity detection. If the
parameter is set to 0 the function is disabled.
25.2 Lack of valve
capacity Alarm
LED indication
Parameter Description
A987 - Low Superheat Check details in alarm and Error table
[A110 – Low SH alarm delay] Length of monitoring window for Low superheat detection.
If the parameter is set to 0 the function is disabled.
[A998 - Low SH alarm
dierential]
The value subtracted from SH reference, which SH has to be below, to be dened as low:
Low superheat limit= SH ref- Low SH alarm dierential.
If Low superheat limit is lower than SH close set point, then Low superheat limit= SH
close set point. Also, Low superheat limit ≥ 2K
25.3 Superheat Alarm
Parameter Description
A988 - High Superheat Check details in alarm and Error table
[A108 – High SH alarm delay] Length of monitoring window for High superheat detection. If the parameter is set to 0
the function is disabled.
[A109 – High SH
alarm dierential]
The value added to SH ref, that SH has to be above, to be dened as high: High superheat
limit= SH ref+ High SH alarm dierential.
Activation or deactivation of superheat alarm (High or Low) can be done by setting followoing
Parameters.
Low superheat alarm
High superheat alarm