Eaton Cutler-Hammer Digitrip RMS 910 Instructions Manual

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

I.L.29-889APage10computedand displayedinthefour-digitdisplay windowon thefaceoftheTripUnit.The power,powerfactorandenergyparametervaluesdisplayedinthewindowon thefaceoftheTripUnitinclude:•PeakDemandin MW(Megawatts)•PresentDemandin MW(Megawatts)•Energy(Consumed)inMWh (Megawatt-hours)•Power FactorFour“Green”LEDs as showninFig.1areprovidedtoindicatewhich valueisdisplayed.Thesame“STEP”push-buttonpressed and released toview the differentvalues ofcurrentand voltageisalsopressedandreleasedtoviewthe power, power factorandenergy val-ues.ThePeakDemandparameterisbased onasamplingwindow offifteen(15)minutes.Powerisrepeatedly aver-agedoverthisinterval and themaximum average is dis-played as PeakDemand. Thedemand windowis nota“slidingwindow”.Itis morelike a“jumpingwindow”.WhentheTripUnitisfirst energized,thereis adelay of15minutesbefore the first non-zerovalueisdisplayed.Toresetthe peakdemandvalue showninthe display win-dowbackto zero,press and releasethe(Black)“DemandReset”push-button,shown adjacenttothe“PeakDemand”label inFig.1. Note:The peakdemand functionrequiresthat120VACcontrolpowerbesuppliedtothePower/ Relay Module.ThePresentDemandisa powervalueaveraged overapproximately one second.Toviewthe“PresentDemand”value inthedisplay window,pressand releasethe“STEP” push-button several timesuntil the LEDnextto“Present MW”islighted.Therange,assumptionsandaccuracyparametersforpeak and presentpowerdemandvalues displayed are:RANGE:0 to 9.999MWASSUMES:5%<Current<175%ofthe Plug RatinglnSAMPLING WINDOW: 15 min.forPeak Demand,-1sec.forPresent DemandACCURACY:rangeassumptionsandaccuracy forthe system powerfactorfunction valuesare:from0.5(lagging)to0.5(leading)balanced three-phase load,perANSIStd.C12.1-1988>20%ofFrame RatingforSeriesC“R-FrameorTypeSPBcircuit breakers.>20%of[Current]SensorRatingforTypeDScircuit breakers.± 0.02The Energyparameteris thesummationofthe averagepowerovertime andit isexpressedinmegawatt-hours(MWh). The valueisupdatedapproximately once a sec-ond.Thevaluecannot be resetlocally. After the maxi-mumvalue is reached,thedisplayautomaticallyrollsovertozero.Therange andaccuracyparametersforenergy demandvaluesdisplayedare:RANGE:RANGE:ASSUMES:CURRENT:CURRENT:ACCURACY:Oto999.9MWhifln<1000AOto9999 MWhifln>1000A5%<Current<175%ofthe Plug Ratingln±5%of(FrameRatingx600V xtime)forSeriesC®R-FrameorTypeSPBcircuitbreakers,±5%of(CurrentSensor Ratingx600Vxtime) for Type DScircuit breakers.Theenergy value isstored inthe TripUnit memory. Aslong asthe 120VACcontrolpower ismaintainedtothePower/ Relay Module,itcanbeviewed.Ifthe120VACcontrol powerislost and then isrestored,the Energyvalue isrestoredtoo.The DigitripRMS910Trip Unit presumesthat power isflowinginto the “top”andoutofthe bottomofthe circuitbreaker (positive flowofpower).Ifthe power flowsin theoppositedirection,i.e.,bottom to top,the valueofpowerwillnotbe displayed continuously. Instead, the powervalue in the display window will alternate with the codedmessage“NPOW”.Thismessage, alternating with thevalue,indicates power flowing outof thetopofthe circuitbreaker.This condition willoccurwhen a Main circuitbreaker is “reverse fed” and canfrequently occur for threebreakerschemes that involve a“tie”breaker. The“NPOW”message can be defeatedon type DS and typeSPB breakers only by inserting an appropriate "jumper”.(See wiring diagram for your typeofcircuit breaker listedin Section6.)ASSUMES:ACCURACY:or± 4%of (Frame Rating x600V) forSeries C®R-Frame or Type SPB circuitbreakers,± 4%of (Current Sensor Ratingx600V)for Type DS circuit breakers.The System Power Factor (PF)is a unitless parameterthat is displayed locally on the Digitrip RMS 910. TheorFiT-N Effective May 1997