Eaton Cutler-Hammer Digitrip RMS 910 Instructions Manual

Also see for Digitrip RMS 910: Instructions Instructional Leaflet Instruction leaflet

I.L.29-889APage4Intheeventthatcontrolpowerislost,theback-up batteryintheRatingPlug(see Section1.3andFigs.1and4)continuestosupplypowertotheLEDs.Tocheck thesta-tusofthebattery,seeSection 4.5.Note:The DigitripRMS910performs all ofitsprotec-tionfunctions regardless ofthestatusofthebattery.Thebatteryservesonlytomaintaintheindicationofthereasonforautomatictrip.Pressandreleasethe“TRIPRESET”push-buttonshowninFig.1,toturn“Off”theLEDs followinga tripoperation.TROL POWERREMAINS AVAILABLETOTHEPOWER/RELAYMODULE.THETRIPUNITMUSTBERESET.BEFORETHECIRCUITBREAKERCANBECLOSED AGAIN.THERESETCANBEACCOM-PLISHED EITHERLOCALLYBYPRESSING ANDRELEASING THE "TRIPRESET’PUSHBUTTON(SEEFIG.1),ORREMOTELYBYTHEIMPACCSYSTEM.(SEE SECTION5.9.)Afteranover-currenttrip operation,thefollowinginforma-tionisstoredin theTripUnitmemory:•thecauseoftrip,•thevaluesofcurrentsat timeoftrip,•the time whenthetripoperationoccurred,•thetotalnumberoftimestheTripUnit hastripped thebreakerelectronically,(doesnotcountshunttripormanualoperations)Ifthe120VACcontrolpowerremainsavailabletothePower/RelayModule,thisinformationcanbe viewed byINCOM®/IMPACC®.(See Section5.6.)Therefore,usersmaywanttousean uninterruptable power supplyforthecontrol powertothe powerrelay module.1.1.2General Over-CurrentProtectionTheDigitrip RMS 910TripUnit iscompletelyself-con-tained and when thecircuit breakerisclosed,requires noexternal control powertooperateitsprotectionsys-tems.It operatesfromcurrentsignallevelsand controlpowerderivedthroughcurrentsensorsintegrallymountedinthe circuit breaker.TheDigitrip RMS910TripUnit is availableinsixdifferenttypes.EachTripUnit maybeequippedwithamaximumoffivephaseandtwoground(time-current)settings (seeSection 3)to meetspecific applicationrequirements. Theprotection availablefor eachtypeissummarizedinTable1,and illustrated in Figures 3.1 through 3.6:ProtectionFunctionsLongTime/InstantaneousLongTime/ShortTimeLong Time/ShortTime /Instantaneous LSI*3.3Long Time / Instantaneous / GroundLong Time / ShortTime /GroundLong Time/Short Time/Instantaneous /GroundNOTE*:RMS DigitripType LI, LS andLSI TripUnitscanbeapplied on 3-pole or 4-polecircuitbreakersforprotection ofthe neutral circuit, IF thecircuitbreakeris wiredandMARKED for NEUTRALPROTECTION.Refertothe National Electric Codefor appropriateapplicationof4-pole breakers.1.1.3Discriminator(High Initial Current Release)(For TypesLS and LSGTrip Unitsonly)WhentheDigitrip RMS910TripUnit is notequippedwithanadjustableinstantaneousprotectionsetting,i.e.typesLS or LSG,a Discriminator circuit(or high initialcurrentrelease) is provided.Thenon-adjustablerelease ispre-set ateleven(11)times the installedratingplug cur-rent(ln).The Discriminator is enabledforapproximatelyten(10)cyclesfollowingthe initialcurrentflowthroughthecircuit breaker,providedthe loadcurrent exceedsapproximately 10%ofthe circuit breaker frame(or cur-rent sensor)rating.Wheneverthe load current falls below10%the discriminator isrearmed. The release,oncerearmed will remain enableduntil the loadcurrent pass-ing through the circuit breaker has exceeded the10%value for10 cycles.Whenever the Discriminator trips thecircuitbreaker,the “OVERRIDE / DIS”LED will light“RED”,and the Display will read “DISC”.In the eventthe breaker is not intended to trip outon acircuit whose current could initially be higher than1 1x1it is possibletomake the Discriminator inactive.TypeFigureLI* 3.1LS* 3.2LIG3.4LSG 3.5LSIG3.6NOTICEAFTEREACH TRIP OPERATION (WHETHER DUE TOOVERCURRENT PROTECTION OR REMOTE CON-TROL) THE AUTOMATIC LOC/COU7-AFTER-TRIPFEATURE OF THE DIGITRIP RMS 910TRIP UNITMAINTAINS THE CIRCUIT BREAKER IN A“TRIP-FREE”CONDITION, PROVIDED 120 VAC CON-rvF:T"N Effective May 1997