Danfoss EKC 331, Sterowniki Chłodnicze, Danfoss
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Capacity controller EKC 331T REFRIGERATION AND AIR CONDITIONING Manual Introduction Application Thecontrollerisusedforcapacityregulationofcompressorsor condensersinsmallrefrigeratingsystems. Regulationcanbecarriedoutwithuptofouridenticalcapacity steps. Advantages •Patentedneutralzoneregulation •Sequentialorcyclicoperation Functions •Regulation Regulationwithuptofourrelayoutputscanbecarriedout. Regulationtakesplacewithasetreferencewhichiscompared toasignalfromapressuretransmitteroratemperaturesensor. •Relaymodule Itispossibletousethecontrollerasrelaymodule,sothatthe relaysarecutinoroutbymeansofanexternalvoltagesignal. • Alarmfunction Arelaybecomesactivatedwhenthesetalarmlimitsareex- ceeded. • Digitalinput Thedigitalinputcanbeusedfor: -nightoperationwherethesuctionpressureisraised -heatrecoverywherethecondensingpressureisraised -externalstart/stopoftheregulation. -Monitoringofsafetycircuit •Possibilityofdatacommunication Display Asignalfromapressuretransmitterwillalwaysbeconvertedand shownasatemperaturevalue. Settingsaremadeasfortemperaturevalues. Function Capacity regulation Thecut-incapacityiscontrolledbysignalsfromtheconnected pressuretransmitter(temperaturesensor)andthesetreference. Outsidethereferenceaneutralzoneissetwherethecapacitywill neitherbecutinnorout. Outsidetheneutralzone(inthehatchedareasnamed+zoneand -zone)thecapacitywillbecutinoroutiftheregulationregisters achangeofpressure(thetemperature)“away”fromtheneutral zone.Cutinandcutoutwilltakeplacewiththesettimedelays. Ifthepressure(thetemperature)however“approaches”the neutralzone,thecontrollerwillmakenochangesofthecut-in capacity. Ifregulationtakesplaceoutsidethehatchedarea(named++zone and--zone),changesofthecut-incapacitywilloccursomewhat fasterthanifitwereinthehatchedarea. Cutinofstepscanbedeinedforeithersequentialorcyclicopera- tion. Manual RS8CU40 © Danfoss 05-006 EKC331T Sequential Therelaysareherecutininsequence–irstrelaynumber1,then ,etc. Cutouttakesplaceintheoppositesequence,i.e.thelastcut-in relaywillbecutoutirst. Cyclic Therelaysarecoupledheresothattheoperatingtimeofthe individualrelayswillbecomeequalised. Ateachcutintheregulationscanstheindividualrelays’timer, cuttingintherelaywithleasttimeonit. Ateachcutoutasimilarthinghappens.Heretherelayiscutout thathasmosthoursonthetimer. Rx=randomrelay h=numberofhours Ifcapacityregulationiscarriedoutontwocompressorswithone unloadereach,thefollowingfunctioncanbeused: Relays1and3areconnectedtothecompressormotor. Relaysand4areconnectedtotheunloaders. Relays1and3willoperateinsuchawaythattheoperatingtime forthetworelayswillbecomeequalised. C=compressor,L=Unloader Relay module Thecontrollercanalsobeusedasarelaymodulewheretherelays inthemoduleareoperatedbythereceivedvoltagesignal.The signalmustbeconnectedtoterminal15-16. Dependingonthedeinitionofthesignalandthenumberof relaysused,therelayswillbe”distributed”overthesignal. Ahysteresisattheindividualcouplingpointswillensurethatthe relaywillnotcutinoroutwhennotrequired. EKC331T Manual RS8CU40 © Danfoss 05-006 3 Suvey of functions Function Para- meter Parameter by operation via data communication Normal display Normallythesignalfromthepressuretransmitter/temperaturesensorisshown Ifthecontrollerisusedasrelaymodule,U in willappearonthedisplay. Pressure/Temp°C Pressure regulation Reference Regulation setpoint Regulationisbasedonthesetvalue. Achangeofthesetvaluecanbelimited/ixedbymeansofthesettingsinr0andr03. (Pushbothbuttonssimultaneouslytosetthemenu.) - Setpoint°C Neutral zone Thereisaneutralzonearoundthereference.Seealsopage. r01 Neutralzone R eference Thesetreferencemaybedisplacedwithaixedvaluewhenasignalisreceivedatthe DIinput.Regulationwillthenbebasedonthesetpointplusthevaluesethere. (Cf.alsoDeinitionofDIinput). r13 OfsetK Thetotalreferencecanbeseenwhenyoupushthelowerofthetwobuttons - Reference Set point limitation Thecontroller’ssettingrangeforthesetpointcanbenarroweddown,sothatyou cannotaccidentallysetatoohighortoolowvalue-thatmayresultindamagetothe system.Withthesesettingsthesetpointcanonlybesetbetweenthetwovalues. Max.permissiblesetpointvalue. r0 Max.setpoint Min.permissiblesetpointvalue. r03 Min.setpoint Correction of temperature measurement Anofsetadjustmentoftheregisteredtemperaturecanbemade.Thefunctionisused ifcorrectionforatoolongsensorcablehastobemade. r04 Adjustsensor Unit Hereyoucanselectwhetherthedisplayistoindicatetemperaturesin°Corin°F. Setting="C-b"willgive°C. Setting="F-P"willgive°F. r05 Unit 0:°C 1:°F (InAKMonly°Cisused,whateverthe setting) Capacity Capacity Running time Topreventfrequentstart/stop,valueshavetobesetforhowtherelaysaretocutin andout. Min.ONtimeforrelays. c01 Min.ONtime Min.timeperiodbetweencutinofsamerelay. c07 Minrecycletime Coupling Cutinandcutoutcantakeplaceinthreeways: 1.Sequential:Firstrelay1cutsin,thenrelay,etc.Cutouttakesplaceintheopposite sequence.(”Firstin,lastout”). .Cyclic:Anautomaticoperatingtimeequalisationisarrangedhere,sothatallsteps willhavethesameoperatingtime.(Therelaywiththefewestnumberofoperating hourscutsinoroutbeforetheothers)(Orputdiferently:”Firstin,lastout”). 3.Cyclicwithunloader:Thefunctioncanonlybeusedwhentherearetwocompres- sorswithoneunloadereach.Thecyclicoperationisperformedonrelays1and3.The unloadersaremountedonrelaysand4(relays1andbelongtotheirstcompres- sor,relays3and4totheother).Theabovementioned”Min.On-time”and"Min. recycletime"arenotusedforunloaders. Inconnectionwithcutout,thetwounloadersarecutouteforethecompressorsare cutout. c08 Stepmode Unloaders’ cutin and cutout mode (Onlyinconnectionwithcutin/cutoutmode3.Seeabove). Therelaysforthetwounloaderscanbesettoswitchonwhenmorecapacityisre- quired(setting=no),ortheycanswitchofwhenmorecapacityiscalledfor(setting =nc). c09 Unloader (switchon=0) (switchof=1) 4 Manual RS8CU40 © Danfoss 05-006 EKC331T Setting for neutral zone regulation Regulationbandundertheneutralzonen c10 +ZoneK Timedelaybetweenstepcut-insintheregulationbandovertheneutralzone c11 +Zonem Timedelaybetweenstepcut-insintheregulationbandoverthe"+Zoneband". c1 ++Zones Regulationbandovertheneutralzone c13 -ZoneK Timedelaybetweenstepcut-outsintheregulationbandundertheneutralzone c14 -Zonem Timedelaybetweenstepcut-outsintheregulationbandunderthe"-Zoneband" c15 --Zones Alarm Alarm settings Thecontrollercangivealarmindiferentsituations.Whenthereisanalarmallthe light-emittingdiodes(LED)willlashonthecontrollerfrontpanel,andthealarmrelay willcutin. Upper deviation Hereyousetwhenthealarmathightemperature/pressureistoenterintoefect.The valueissetasanabsolutevalue. Seealsoemergencyprocedurepage7. A10 Max.press/Temp. Lower deviation Hereyousetwhenthealarmatlowtemperature/pressureistoenterintoefect.The valueissetasanabsolutevalue. Seealsoemergencyprocedurepage7. A11 Min.press/Temp. Alarm delay Ifoneofthetwolimitvaluesisexceeded,atimerfunctionwillcommence.Thealarm willnotbecomeactiveuntilthesettimedelayhasbeenpassed.Thetimedelayisset inminutes. A03 Alarmdelay Givethetopbuttonabriefpushtozerosetthealarmandtohavethemessageshown onthedisplay. Resetalarm Thefunctionzerosetsallalarmswhen setinpos.ON. Alarmrelay Hereyoucanreadthestatusofthe alarmrelay. (ONindicatesoperationwithalarm). Withdatacommunicationtheimpor- tanceoftheindividualalarmscanbe deined.Settingiscarriedoutinthe “ Alarm destinations ”menu. Miscellaneous Miscellaneous External signal Hereyousetthesignaltobeconnectedtothecontroller. 0:Nosignal/regulationstopped(displaywillthenshowOFF) 1:4-0mAfrompressuretransmitterforcompressorregulation :4-0mAfrompressuretransmitterforcondenserregulation 3:PressuretransmittertypeAKS3Rforcompressorregulation 4:PressuretransmittertypeAKS3Rforcondenserregulation 5:0-10Vfromotherregulation 6:0-5Vfromotherregulation 7:5-10Vfromotherregulation 8:Pt1000ohmtemperaturesensorforcompressorregulation 9:Pt1000ohmtemperaturesensorforcondenserreguation 10:PTC1000ohmtemperaturesensorforcompressorregulation 11:PTC1000ohmtemperaturesensorforcondenserregulation o10 Applicationmode Number of relays Dependingontheapplication,uptofourrelaysmaybeused.Thisnumbermustbe setinthecontroller.(Therelaysarealwaysusedinnumericalsequence). o19 Numberofsteps Pressure transmitter’s working range Dependingonthepressure,apressuretransmitterwithagivenworkingrangeis used.Thisworkingrangemustbesetinthecontroller(e.g.:-1to1bar Thevaluesmustbesetinbarifdisplayin°Chasbeenselected.Andinpsig,if°Fhas beenselected. Ifthetwovaluesaretobesetfromthe AKMprogramme,theymustbesetin bar. Min.value o0 Min.trans.press Max.value o1 Maxtrans.press EKC331T Manual RS8CU40 © Danfoss 05-006 5 [ Pobierz całość w formacie PDF ] |