Eaton Cutler-Hammer Digitrip RMS 910 Instructions Manual

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

I.L.29-889APage17TABLE4-GROUNDFAULTCURRENTSETTINGS%GROUND FAULTCURRENT SETTINGS(AMPERES),?*4GridFaultTime|~3]Sec.ABCD EFHK1002530 35405060100752005060 70 80 100 120150200O0250637588100 125150188250•CN-£300£6007590105120150180 225300100 120140160 200 240300400150 180210240300360450 600CL^630^800189221158252315378473630AvailableSettings200 240280 320400 480600800O.1,.2,.3,.4..5JiD1000CL1200°1250250300350400 500 600750 1000300360420480 600 7209001200SecondswithFlatResponsei31237543850062575012009382160001200040048056064080096012001200]500600700 8001000120012001200ILI24006007208409601200120012001200^2500625750875 10001200 120012001200C/D3000/3150750 900 105012001200120012001200l2tShapeReturnstoFlatResponsesatApproximately0.625ln2:3200960800112012001200120012001200400010001200120012001200 120012001200500012001200 120012001200 1200 12001200iT"i*i:Tolerancesonsettingsare±10%ofvaluesshown.RefertoTypeDS.TypeSPBorSeries CR-Framesupplementalinstructionleaflets giveninSection6forlistofavailableratingplugsforeachtypecircuit breaker.t.1\.3*,.5*iI%Seconds With’rl2tShapeIInViewingWindowIndicatesl2tShape3.0 PROTECTIONSETTINGSFig.8.7Ground Fault TimeDelaySettingThe available settings,along with the illustratedeffect ofchangingthesettings aregiveninFigs.8.1 through8.7.3.2Long Delay Current SettingThere areeight(8) availableLongDelay“Pick-up"Cur-rent Settings,asillustratedinFig.8.1.Each setting,calledis expressed as amultiple(ranging from.5 to1) oftheratingplug current(ln).Note:“/r”isalso the basis fortheShort-Delay Cur-rent Setting.(SeeSection 3.4.)3.1 GeneralPriortoplacing anycircuit breakerin operation, eachTripUnit protection settingmustbeset tothe valuesspecifiedbythe person responsible fortheinstallation.Thenumberofsettingsthatmust be made isdeterminedbythe pro-tection supplied as illustratedin Figs.8.1 through8.7.Each setting is made with arotaryswitch,using a smallscrewdriver.The selected settingforeach adjustmentappears initsrespectiverectangular viewing window asillustrated in Fig.1.The installed rating plug establishes the maximumcon-tinuous current rating(ln),upto,but not exceeding theFrameRatingof thecircuitbreaker.Instantaneous andgroundcurrent settings are definedinmultiplesof(ln).To illustrate the effect ofeach protection curvesetting,simulated Time-Current curves are pictured on the faceoftheTrip Unit. The rotaryswitch usedto make each set-ting is located nearest thatportionofthe simulatedTime-Current curve itcontrols.Should an automatic‘TRIP”occur (asaresultofthe current exceeding thepre-selected value),the LED in the appropriate segmentofthe simulated Time-Current curve will light“RED”, indi-cating the reason for the'TRIP”.3.3 Long Delay Time SettingThere are eight (8) availableLong DelayTime Settingsas illustrated in Fig.8.2,rangingfrom2 to24 seconds.These settings are the total clearing times in seconds,when the currentvalueequalssix (6)timeslr. The(LS)Time-Current Curve applicable for your circuit breakergives complete details.(See Section 6.)Note: Inadditiontothe standard Long Delay Protec-tion Element, the Digitrip RMS 910Trip Unit also hasa Long Time Memory (LTM) function, which servestoprotect load circuits from the effects of repeatedoverload conditions.If a breaker is re-closed soontF:T'NEffective May 1997