XITRON XT2640 - Configuring Mechanical Measurements (Motor or Generator)

XT2640OperatingManual 13July2016 Page44of187
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ThissettingcanbeusedincombinationwiththeDIGITSsetting(seebelow)toreducethejitterinreadingsfromunstable
signals.
12.4.2.3.3 Settingth eMaximumNumber ofDisplayedDigits
TheDIGITSbuttonallowsyoutoselectthatallavailablemeasurementresultswillbedisplayedwithlimitedresolutionifdesired.
Settingsof3,4,5and6areavailable.
Recommendation:
Inmostapplicationsthisshouldbesetto5or6,ifthereissignificantinstabilityinthesignalsthisshouldbesetto3or4.
Note:
Thisonlyaffectsdisplayednumericalresults;itdoesnotaffectanymeasurementsobtainedviaaninterfaceorviaa
historicallysavedrecordorviadatalogging.
12.4.2.3.4 Adjustin gMeasu rement sforVorATerminalBurden
TheADJUSTbuttonallowsyoutoselectthatresultsofeachchannelareadjustedtocompensateforeitherthecurrentdrawnbytheV
terminalsorforthevoltagebetweentheAterminals.
Thelabellingofeachselectionshowswhetheryouneedresultsatthesourceorattheload,followed(inbraces)bywhethertheV
terminalsofeachchannelareconnectedatthesourceortheload.
IfyouselectNONEthennoadjustmentsareperformed,theresultsusetheunadjustedvoltageandcurrentsignals.
IfyouselectSRCE(V@SRCE)thentheVterminalcurrentburdenisaddedtotheAsignal.ThisshouldbeusedwhentheV
terminalsaredirectlyconnectedacrossthesourcevoltage(sotheAterminalsaremeasuringtheloadcurrent)andyou
wishtoobtainthesourceresults.
IfyouselectSRCE(V@LOAD)thenAterminalvoltageburdenisaddedtotheVsignal.ThisshouldbeusedwhentheV
terminalsaredirectlyconnectedacrosstheloadvoltage(sotheAterminalsaremeasuringthesourcecurrent)andyou
wishtoobtainthesourceresults.
IfyouselectLOAD(V@SRCE)thentheAterminalvoltageburdenissubtractedfromtheVsignal.Thisshouldbeusedwhen
theVterminalsaredirectlyconnectedacrossthesourcevoltage(sotheAterminalsaremeasuringtheloadcurrent)and
youwishtoobtaintheloadresults.
IfyouselectLOAD(V@LOAD)thentheVterminalcurrentburdenissubtractedfromtheAsignal.Thisshouldbeused
whentheVterminalsaredirectlyconnectedacrosstheloadvoltage(sotheAterminalsaremeasuringthesourcecurrent)
andyouwishtoobtaintheloadresults.
Recommendation:
InmostapplicationsthisshouldbesettoNONE;onlyifnotusingexternalcurrenttransducersandeitheroperatingatlow
voltagesandhighcurrentsorathighvoltagesandlowcurrentsshouldthisbesetforanadjustmenttobeapplied.
Seesection18forfulldetailsregardingconfiguringthisforEN61000‐3‐2and‐12measurements.
Note:
ChannelswhichhavescalingappliedignoretheADJUSTsettingandtheirsignalsarenotadjusted.
12.4.2.4 CONFIGURINGHO WRES ULTSARE COMBINED
ThisisperformedbyusingthebuttonsintheCOMBINEarea.
DependingonconfigurationandtheinstalledchannelsnotallbuttonsmaybepresentandtheCOMBINEareaitselfmaynotpresent.
12.4.2.4.1 SettingHowtheChannelsareWired 
TheWIRINGbuttonallowsyoutoselecthowmeasurementsarecombinedandlabelledwhenproducingtotalresultsforthisVPA.
TheselectionmademustmatchthemethodusedtowiretheapplicationtotheXT2640channelsinthisVPA.
Note:
TheavailableselectionsaredeterminedfromthenumberofchannelsselectedinthisVPA.Ifthenumberofchannelsis
alteredthenthissettingwillberesettotheNx1øsetting(whichisvalidforanynumberofchannels).
12.4.2.4.2 SettingHowPowerwillbeInc ludedinEfficiencyandPower Loss
TheEFF/LOSSbuttonallowsyoutoselecthowthetotalpowerofthisVPAisincludedinefficiencyandpowerlossdata.
ThisbuttonisnotavailableifMEASMODEissettoSINGLEVPAorSPECTRUM.
TheXT2640allowsthetotalwattsofaVPAtobeincludedinoneofthreeavailabledata;IN,MIDDLEandOUTpower.Alternatelythe
totalpowerofthisVPAcanbeexcludedfromallthreeofthese.
Note:
IftheXT2640isconfiguredaspartofamulti‐unitgroupthentheresultingIN,MID,OUTpowertotals,powerlossand
efficiencyresultswillincludethetotalIN,MIDandOUTpowermeasurementsfromallXT2640swithinthatmulti‐unit
group.
12.4.3 CONFIGURINGMECHANICALMEASUREMENTS (MOTOROR GENERATOR)
IfaMTtypechannelisinstalledintheCH4locationthentheCONFIGVPAbuttonisalwaysshownandallowsyoutoselectwhethera
VPAortheMOTORmeasurementsaretobeconfigured.
TheexamplescreenshownbelowisanexampleoftheMOTORconfigurationscreen.