Danfoss AKC 25H1 Description

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Danfoss AKC 25H1 Description Manual pdf 13 page image

AKC 25H1 Function description RC.1J.Z4.02 © Danfoss 09/1999 13Monitoring of minimum suction pressureThe function immediately cuts out all compressor steps if the suction pressure becomes lowerthan the permitted value. The cut out limit can be defined in the range between -100 and+30°C.The suction pressure is measured with the pressure transmitter on the PO input.Cut outs activate:- the alarm function and- the function “AKC ON” is interrupted.The alarm ceases when the following conditions are complied with:- the pressure (temperature) is above the cut out limit- the delay time has ecpired (see later)Renewed cut in of compressor steps is allowed when the following conditions are compliedwith:- the alarm has stopped (the time delay has expired)- the time delay prior to renewed cutin has expiredSafety functions Limits with 1.Priority P0 Min°C ___Time delayThere is a common time delay period for the three earlier mentioned functions: Monitoring ofmax. discharge temperature, max. discharge pressure, and min. suction pressure.After a cut out, regulation cannot commence again until the time delay has expired.The time delay starts when the temperature has again dropped to 10 K and 3 K, respectively,below the limit value. Or when the pressure has risen above the P0min value.The time delay can be defined in the range between 0 and 30 minutes.Safety functions Limits with 1.Priority Restart m ___Monitoring of suction gas superheatThe function monitors the superheat and gives an alarm, if the superheat becomes higher orlower than the defined values.Superheat is measured with the pressure transmitter on the PO input and the temperaturesensor on the Ss input.Maximum superheatThe alarm limit can be defined in the range between 20 and +80 K.Minimum superheatThe alarm limit can be defined in the range between 0 and +20 K.Time delayThe alarm will not be sounded until the time delay has expired. The time delay can be definedin the range between 0 and 60 minutes.Safety functions Limits with 1.Priority SH Max K ___SH Min K ___SH Delay m ___