Eaton Cutler-Hammer Digitrip RMS 910 Instructions Manual

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

I.L.29-889APage28BECAUSETHE AUTOMATICLOCKOl/T-AFTER-TRIPFEATUREOF THEDIGITRIP RMS910TRIP UNITMAINTAINS THE CIRCUITBREAKERINA“TRIP-FREE”CONDITION,THE TRIPUNITMUSTBERESETAFTEREACHTRIPOPERATION(WHETHERINITIATEDBYOVER-CURRENT CONDITIONSOR BYREMOTE INCOM®/IMPACC®SIGNAL),BEFORETHEBREAKERCANBECLOSED AGAIN.THERESETCANBEACCOMPLISHEDEITHERLOCALLYBYPRESSINGANDRELEASING THE“TRIPRESET”PUSH BUTTON (SEEFIG.1),ORREMOTELYBYTHEIMPACC®SYSTEM.Although thereset canbe accomplishedlocallybypress-ing andreleasing the“TRIPRESET’ pushbutton(SeeFig.1),itis sometimesinconvenientor untimelytogotothecircuitbreakerinordertoresetthe TripUnit.Forsuchcaseswhere thecircuitbreaker isfarfromtheplantcon-trol room,theIMPACC®systemprovides the userwith ameansforresetting thecircuit breakerthroughthe com-munications network‘TripUnit Reset”command.Execut-ing theTripUnitResetcommand remotely from themaster computerby the INCOM®/IMPACC® systemisexactly equivalenttopressingandreleasingthe“TripReset”push-buttononthe front of the Trip Unit.Inadditionto theTrip UnitResetcapability, the INCOM®/IMPACC®communicationscapabilityoftheTripUnitpro-vides the userwithameans for resettingseveralparame-tervalues stored in theTripUnit’smemory.Using theproper commands,theuser can view and reset thefol-lowing tripeventbufferparameters remotely:timeoftrip,valuesofphase andgroundcurrents,numberofelectron-icallyinitiated trip operations,peak[power] demand,energy and thecause oftrip.6.0REFERENCES6.1Digitrip RMS Trip AssembliesI.L.29-885Instructions for DigitripRMS 510Trip UnitI.L. 29-886InstructionsforDigitrip RMS 610Trip UnitI.L. 29-888Instructions for Digitrip RMS 810Trip UnitI.L. 29-889 Instructions for DigitripRMS 910Trip UnitcationsClose” contactinthePower RelayModuletoclose(seewiresCC1 andCC2 inFig.2),making thecir-cuitbreaker’sclosing controlcircuit,and releasing ittoclose.(Seethe connection diagramapplicable foryourcircuitbreaker listed in Section6.)WhentheElectricalOperatororSpring Releaseoptionispurchasedforthecircuit breaker,theCommunicationsClosecontactiswired into thecloserelease circuitatthefactory.TheTRIPcommandcausestheDigitrip RMS910TripUnittooperatethecircuitbreaker’strip release(see“CD”inFig.2).The triprelease remains locked-out, sothatthecircuitbreakercannotbe reclosed,untiltheTripUnitisreset.(See Section5.9.)TheTripUnitdisplays“EXTT”in itswindow and sends back the“EXTT”messageoverINCOMtotheremotemastercomputer.(Note that thevaluesofthecurrentsthroughthecircuitbreakerwillbe“zero”whenitisOPEN.)WARNINGUNEXPECTEDSIGNALSTO"CLOSE’OR"TRIP’ACIRCUITBREAKERFROMAREMOTE LOCATIONBYTHE COMMUNICATIONS NETWORK CANCAUSEPERSONAL INJURYTOMAINTENANCEPERSONNELWORKING IN THE IMMEDIATEVICINITYOFTHE CIR-CUITBREAKER. PROVIDEPERMISSIVE CONTROLSWITCHES,OR OTHERMEANS,LOCALLYATTHECIRCUITBREAKERFOR MAINTENANCE PERSON-NELTOUSEIN CONTROLLINGREMOTE "CLOSE’OR "TRIP’SIGNALS.FORDETAILEDINFORMATIONCONCERNING THE BREAKER CONTROL CIRCUITSNECESSARYTOIMPLEMENTPERMISSIVE CON-TROL LOCALLY,REFERTO THECIRCUIT BREAKERCONNECTIONDIAGRAMS LISTED IN SECTION 6.5.9 Remote Resetting oftheTripUnitNOTICEBEFORE RESETTING TRIP UNIT,BE SURE TO:• RECORD DISPLAY VALUES OF ALL PERTINENTPARAMETERS.• NOTE WHICH CAUSE OF TRIP LEDS ARELIGHTED" RED’•CORRECT THE CAUSE OF THE OVERCURRENTOR FAULT CONDITION THAT CAUSED THEBREAKER TO TRIP.6.2 Type DS Low-Voltage AC Power Circuit BreakersI.B. 33-790-1Instructions for Low-Voltage PowerCircuit Breakers Types DS and DSLSupplement B Digitrip RMS 510,610 and 910TriptoI.B. 32-790-1 Units with Types DS and DSL Low-Voltage Power Circuit BreakersE:T»N Effective May 1997