epro MMS 6000 - Page 18

 MMS6110Directionforuse
 Configuration  Page16
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Propertypage"Dataacquisition"mayonlybeeditedwithaccessauthorization
SERVICE,theauthorization"OPERATION"onlypermitswatchingoftheparameters.
EntryfieldUppercut-offfrequency(-3dB)
Thisfieldservesthedefinitionoftheuppercut-offfrequencyforindicationpurposesandfor
calculationofthecharacteristicalvariable.Thecut-offfrequencydefinesthe-3dBpointofthe
low-passfilter,itmaybesettoanyvaluebetween50and2000Hzinstepsof0.01Hz.

DIN45670forshaftvibrationmeasuringequipmentcomprisesoperatingfrequency
rangesforcharacteristicalvaluesofdifferentgroupsofmachines.Accordingtofig.4of
thestandard,thisrangeislimitedbythe-1dBpoints.Thus,theuppercut-offfrequency
atthe-3dBpointishigherthanthatoftheoperatingfrequencyrangeatthe-1dBpoint.
Forthisreasonasafetymarginof20Hzcanbeaddedupforconsiderationoftoler-
ances.
Thisshowsthefollowing:
250HzOperatingcut-offfrequency≅312Hzcut-offfrequency(-3dB)+20Hz=332Hz
1500HzOperatingcut-offfrequency≅1880Hzcut-offfrequency(-3dB)+20Hz=2000Hz
ListLowercut-offfrequency(-1dB)
Withthislistthelowercut-offfrequencyoftheoperatingrange(-1dBpoint)canbesettoei-
ther1Hzor5Hz.Fortheoperatingfrequencyof1Hzthe-3dBpointofthehighpassfilteris
0.5Hz,withanoperatingfrequencyof5Hzthispointisat2Hz.
ListControl
Calculationandindicationofmeasuringdatacanbesettothetimeorspeedcontrolledmode
bymeansofthisparameterlist.Iftogglekey"Supportdiagnosissystem"hasbeenactivated,
theprogramswitchesautomaticallytothespeedcontrolledmode.
• Inthetime-controlledmode,nomeasurementresultscanbeshownwithfunctions"dis-
playorderanalysis"and"displayrun-up/run-down".Themaximummeasuringspeedis
5120samples/sec.Thenumberofsamplespermeasuringcycleresp.thedurationofa
measuringcycledependsonthedefinedloweroperatingfrequency.
• Havingchosenthespeedcontrolledmode,thetriggersignalatthekeyinputisusedto
controlprocessingandindicationofthemeasuringsignals.Ifthissignalisnotavailableor
ifthefrequencyissmallerthanthedefinedsubspeedorgreaterthanoverspeed,the
diagnosticprogramrunsinthetimecontrolledmode.Thecontentsofthelistfieldisnot
changedbythis,themeasuringresultsfordisplayingtheorderanalysis,measuring
dataandrun-up/run-downwillbeprocessedanddisplayed.
Inthespeed-controlledmodetheupperfrequencylimitmaybereducedathigherspeeds
(refertolistfieldrevolutionspercycleandmeasurementsperrevolution).Inthiscaseitis
recommendedtochoosethetimecontrolledmodeforthemonitoringfunctionandtoselect
thespeedcontrolledmodeonlyforperformingtheorderanalysis.