Application Alarms; Thermostat Alarms - Danfoss EKE 1A User Manual

Superheat controller, Type EKE 1A, 1B, 1C, 1D

8.1.5 Application alarms

Table 59: Application alarms
Label Alarm description Actions during ac‐
tive
A994 Low S4 media outlet
temperature
A991 High evaporation
pressure (MOP)
A990 Low evaporation
pressure (LOP)
A989 High condensing
temperature
A988 High superheat
(1)
A987 (2) Low superheat
A986 Lack of valve capaci-
ty
E135 Error in Heat/Cold in
thermostat mode
(1) (1)
• Length of monitoring window for High superheat detection can be adjusted using parameter [A108 – High SH alarm delay]. If the parameter • Length of monitoring window for High superheat detection can be adjusted using parameter [A108 – High SH alarm delay]. If the parameter
is set to 0 the function is disabled. is set to 0 the function is disabled.
• The high superheat limit is defined by the user through parameter [A109 – High SH alarm differential] High superheat limit= SH ref+ High SH • The high superheat limit is defined by the user through parameter [A109 – High SH alarm differential] High superheat limit= SH ref+ High SH
alarm differential. alarm differential.
(2) (2)
• Length of monitoring window for Low superheat detection can be adjusted using parameter [A110 – Low SH alarm delay]. If the parameter • Length of monitoring window for Low superheat detection can be adjusted using parameter [A110 – Low SH alarm delay]. If the parameter
is set to 0 the function is disabled. is set to 0 the function is disabled.
• The high superheat limit is defined by the user through parameter [A998 - Low SH alarm differential] • The high superheat limit is defined by the user through parameter [A998 - Low SH alarm differential]
Low superheat limit= SH ref- Low SH alarm differential, If Low superheat limit is lower than SH close set point, then Low superheat limit= SH ref- Low SH alarm differential, If Low superheat limit is lower than SH close set point, then
Low superheat limit= SH close set point. Low superheat limit= SH close set point.

8.1.6 Thermostat alarms

Table 60: Thermostat alarms
Label Alarm description Actions during ac‐
tive
A993 High temperature
A992 Low temperature
© Danfoss | Climate Solutions | 2022.06
Trigger (how the alarm IS How to clear the alarm
raised)
Injection active and Min S4 Injection not active or Min S4
function active and S4 below function disabled or S4 above
MIN S4 set point - Low Min S4 MIN S4 set point - Low Min S4
band and Low Min S4 delay ex- band
pired
Injection active and Mop active Injection not active or Mop dis-
and Te higher than mop set abled or Te below mop set
point + MOP alarm differential point + MOP alarm differential
and MOP alarm delay expired
Injection active and Lop active Injection not active or Lop disa-
and Te lower than lop set point bled or Te above lop set point +
- LOP alarm differential and LOP alarm differential
Cond temp alarm delay expired
Injection active and HCTP ac- Injection not active or HCTP
tive and Tc above HCTP set disabled or Tc below HCTP set
point + Cond. temp.alarm dif- point + Cond. temp.alarm dif-
ferential and LOP alarm delay ferential
expired
Injection active and SH above Injection not active or SH below
SH reference +High SH alarm SH reference +High SH alarm
differential and High SH alarm differential
delay expired
Injection active and SH below Injection not active or SH above
SH reference - low SH alarm dif- SH reference - low SH alarm dif-
ferential and low SH alarm de- ferential
lay expired
Injection active and OD higher Injection not active or OD high-
than max OD - 5% for more er OD - 5% in less than 88% for
than 90 96 of Lack of capacity Lack of capacity alarm delay
alarm delay time time
Use of DI as H/C function in Avoid H/C function in DI while
thermostat mode. in thermostat mode.
Trigger (how the alarm IS How to clear the alarm
raised)
Thermostat active and thermo- Thermostat not active or ther-
stat temperature (s4/ S3) above mostat temperature (s4/S3) be-
actual reference + Upper tem- low actual reference + Upper
perature alarm for Temperature temperature alarm
alarm delay time
Thermostat active and thermo- Thermostat not active or ther-
stat temperature (s4/ S3) below mostat temperature (s4/S3)
actual reference - lower tem- above actual reference - lower
perature alarm for Temperature temperature alarm
alarm delay time
Remark
Media out temperature is below alarm lim-
it and alarm delay has expired.
Pe /Te is higher than alarm limit and alarm
delay has expired.
Pe /Te is lower than alarm limit and alarm
delay has expired.
Pc / Tc is higher than alarm limit and alarm
delay has expired.
Superheat is higher than alarm limit and
alarm delay has expired.
Superheat is below alarm limit and alarm
delay has expired.
Valve is running close to full capacity for
long time.
H/C function not available in thermostat
mode.
Remark
Thermostat temperature is higher than
alarm limit and alarm delay has expired
Thermostat temperature is lower than
alarm limit and alarm delay has expired
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