Eaton Cutler-Hammer Digitrip RMS 910 Instructions Manual

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

I.L.29-889APage19VERIFYTHATNOVOLTAGEISPRESENTONTHECIRCUITBREAKERBEFORE REMOVINGTHEVOLT-AGEDISCONNECTPLUG.(SEE FIG.6.)REMOVETHEVOLTAGEDISCONNECTPLUGTOISO-LATETHE POTENTIAL TRANSFORMER MODULE(FIG.6)BEFOREPERFORMING ANYVOLTAGETESTSONTHE CIRCUITBREAKER.REINSTALLTHEPLUG ONLYAFTER ALLVOLTAGETESTSHAVEBEENCOMPLETEDAND CONFIRMTHATNOVOLT-AGEIS PRESENT ON THECIRCUITBREAKER.REINSTALLTHEVOLTAGEDISCONNECTPLUG TORECONNECT THE POTENTIAL TRANSFORMERMODULEBEFOREPLACINGTHE BREAKERBACKINTOSERVICE.REFER TOTHEAPPLICABLECIR-CUITBREAKER INSTRUCTIONLEAFLET SUPPLE-MENT(LISTEDIN SECTION6)FORCOMPLETEINSTRUCTIONS.Five flat(.1,.2, .3,.4,.5sec.)and threel2t(.1*,.3*,.5*sec.)responsetimedelaysettingsareavailable.Thel2tresponse settingsareidentifiedby the suffix asterisk(*)thatappears inthesettingviewing window.Thel2tresponseisapplicableto currentslessthan0.625xln(Thelnvalueismarkedontheinstalled ratingplug).Forcurrents greaterthan 0.625xln,thel2t responserevertstotheflatresponse.Note:SeealsoSection1.1.5 on Zone Interlocking.Note:InadditiontothestandardGroundFaultpro-tection,the DigitripRMS910TripUnit alsohasaGROUNDTIMEMEMORY(GTM)function,whichservestoprotectloadsin theeventof asputteringarctoground.WithouttheGTMfunction,theTripUnit would normallyreseteachtimethearcsput-tered,andbegintotime-outallover again,sothatasputteringfault maynot havebeendetected.But withthe GTM function,theTrip Unit“remembers”thesputtering ground currentforuptofive(5)timestheGroundFaultTimeSetting.Afterthattime,it doesresetautomatically.TheGTMfunctiondoesresetrather quickly;on the0.1second setting,forexam-ple, itwillresetin0.5 second.CAUTIONTESTING A CIRCUITBREAKERUNDER“TRIPCON-DITIONS”WHILE IT ISINSERVICE AND CARRYINGLOADCURRENT,WHETHERDONEBY LOCALLYORBYREMOTEMEANS, IS NOTRECOMMENDED.ANY TRIPPING OPERATIONWILLCAUSE DISRUP-TION OFSERVICEAND POSSIBLE PERSONALINJURYRESULTING FROMUNNECESSARYSWITCH-INGOFCONNECTEDEQUIPMENT.TESTINGOFACIRCUIT BREAKERTHAT RESULTSINTHETRIPPING OFTHECIRCUIT BREAKERSHOULD BE DONE ONLY WITHTHECIRCUITBREAKERIN THE “TEST”OR“DISCONNECTED”CELL POSITIONS OR WHILETHECIRCUITBREAKERIS ONATEST BENCH.4.0TESTPROCEDURES4.1 GeneralDANGERDONOT ATTEMPT TOINSTALL,TESTORPERFORMMAINTENANCE ONEQUIPMENTWHILE IT IS ENER-GIZED. DEATHORSEVERE PERSONAL INJURYCANRESULT FROMCONTACT WITH ENERGIZEDEQUIP-MENT.DE-ENERGIZE THE CIRCUIT AND DISCONNECTTHECIRCUIT BREAKER BEFORE PERFORMING MAINTE-NANCEORTESTS.DONOT ATTEMPT TOPERFORMDIELECTRIC(ORHIGHPOT OR HIGHVOLTAGE) WITHSTAND TESTSON THE CIRCUIT BREAKER WHILETHEVOLTAGEDISCONNECT PLUG TO THE POTENTIAL TRANS-FORMER MODULE IS INSTALLED. (SEE FIG. 6 ANDINSTRUCTIONS FOR TESTING YOUR SPECIFIC CIR-CUIT BREAKER LISTED IN SECTION6.)PTM ORTRIP UNIT DAMAGE OR FAILURE CAN RESULTFROM ENERGIZING PTM AT MORE THAN 600 VOLTS.4.2 WhenTo TestTestscan be conducted with the breaker in the“con-nected”cellposition while carrying loadcurrent.How-ever,asstated inthe cautionnotein Section 4.1, goodpractice will limit circuit breakerin-service“trip tests”,where required,tomaintenance periods during timesofminimum load conditions.Testing is accomplished withthebreakeroutofits cellorin the‘Test”,“Disconnected”or“Withdrawn” (or Removed) cell positions.Note: Since time-currentsettings are based ondesiredsystemcoordination and protectionschemes,the protection settings selected and presetin accordance with Section 3 above should not bealtered during or as a partof any routine testsequence.F:T'NEffective May 1997