Danfoss AK-CC 550 - Control System Parameters; Compressor Control Settings; Defrost Control Settings

AK-CC550 Manual RS8EN502 © Danfoss 02-2010 17
Compressor Compressor control
Thecompressorrelayworksinconjunctionwiththethermostat.Whenthethermo-
stat calls for refrigeration the compressor relay be operated.
Running times
Topreventirregularoperation,valuescanbesetforthetimethecompressoristorun
once it has been started. And for how long it at least has to be stopped.
Therunningtimesarenotobservedwhendefrostsstart.
Min.ON-time(inminutes) c01 Min.Ontime
Min.OFF-time(inminutes) c02 Min.Otime
Time delay for couplings of two compressors
Settingsindicatethetimethathastoelapsefromtherstrelaycutsinanduntilthe
next relay has to cut in.
c05 Step delay
TheLEDonthecontroller’sfrontwillshowwhetherrefrigerationisinprogress. Comp Relay
Hereyoucanreadthestatusofthe
compressor relay.
Defrost Defrost control
The controller contains a timer function that is zeroset after each defrost start.
Thetimerfunctionwillstartadefrostif/whentheintervaltimeispassed.
Thetimerfunctionstartswhenvoltageisconnectedtothecontroller,butitisdis-
placedthersttimebythesettingind05.
Ifthereispowerfailurethetimervaluewillbesavedandcontinuefromherewhen
the power returns.
This timer function can be used as a simple way of starting defrosts, but it will always
actassafetydefrostifoneofthesubsequentdefroststartsisnotreceived.
Thecontrolleralsocontainsareal-timeclock.Bymeansofsettingsofthisclockand
timesfortherequireddefrosttimes,defrostcanbestartedatxedtimesoftheday.
Defroststartcanalsobeaccomplishedviadatacommunication,viacontactsignalsor
manual start-up.
Allstartingmethodswillfunctioninthecontroller.Thedierentfunctionshavetobe
set,sothatmultipledefrostsareavoided..
Defrost can be accomplished with electricity, hotgas or brine.
The actual defrost will be stopped based on time or temperature with a signal from a
temperature sensor.
Defrost method
Hereyousetwhetherdefrostistobeaccomplishedwithelectricity,gas,or(none).
During defrost the defrost relay will be cut in.
d01 Def. method
0 = non
1 = El
2=Gas
Defrost stop temperature
Thedefrostisstoppedatagiventemperaturewhichismeasuredwithasensor(the
sensorisdenedind10).
Thetemperaturevalueisset.
d02 Def. Stop Temp
Interval between defrost starts
Thefunctioniszerosetandwillstartthetimerfunctionateachdefroststart.When
the time has expired the function will start a defrost.
The function is used as a simple defrost start, or it may be used as a safeguard if the
normal signal fails to appear.
Ifmaster/slavedefrostwithoutclockfunctionorwithoutdatacommunicationisused,
theintervaltimewillbeusedasmax.timebetweendefrosts.
Ifadefroststartviadatacommuncationdoesnottakeplace,theintervaltimewillbe
used as max. time between defrosts.
Whenthereisdefrostwithclockfunctionordatacommunication,theintervaltime
must be set for a somewhat longer period of time than the planned one, as the
intervaltimewillotherwisestartadefrostwhichalittlelaterwillbefollowedbythe
planned one.
Inconnectionwithpowerfailuretheintervaltimewillbemaintained,andwhenthe
powerreturnstheintervaltimewillcontinuefromthemaintainedvalue.
Theintervaltimeisnotactivewhensetto0.
d03 DefInterval
(0=o)
Max. defrost duration
This setting is a safety time so that the defrost will be stopped if there has not already
beenastopbasedontemperatureorviacoordinateddefrost.
d04 Max Def. time
Time staggering for defrost cutins during start-up
Thefunctionisonlyrelevantifyouhaveseveralrefrigerationappliancesorgroups
where you want the defrost to be staggered in relation to one another. The function is
furthermoreonlyrelevantifyouhavechosendefrostwithintervalstart(d03).
Thefunctiondelaystheintervaltimed03bythesetnumberofminutes,butitonly
doesitonce,andthisattheveryrstdefrosttakingplacewhenvoltageisconnected
to the controller.
Thefunctionwillbeactiveaftereachandeverypowerfailure.
d05 Time Stagg.