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Neutral system
(2006-05-30 06:23:15)
AboutNeutralsystemthereare
patternmatchandpatternrecognotion,soinordertofinishtheabovefunction,firstmusthavealotsamplethatstoredinthedatabase,andthemethodhowtofastandquicklytofinishthefunction.[阅读全文]
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Experience with Koyo PLC260
(2006-05-29 08:35:34)
Hardwarespecific:
1Insulation:
>10mOhmat500vDC
2dielectric:
1500V1minutes
3auxiliaryrelay:
24vDCmaxmum300ma
4installation:
powertoPLCascloseaspossible
theinstllationofthePLCtothecontrolboxatleast50mmdistance
5Groundwire:
thegroundwiremustappliedthenationalcode,andatleast12AWG.
6FiterforthePower:
puttheproperfiltertoavoidsurgetohurtPLC
Sinking...[阅读全文]
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Experience with Koyo PLC
(2006-05-29 07:57:06)
Hardwarespecific:
1PLCpower:
Directcomefromoutside,asfarawaytothesignal,atleast12awgofthegroundcable
2insulation:
>10mohm,500VDC
3Dielectric:
1500V1minutes
424DCrelaymaxmumcurrent:
300ma
5inputresponsetime:
1to9ms
6inputcurrent:
4to8ma
7inputimpendence:
2.7khomto3.9hom
8sinking:
DCpowernegativeconnecttocommom
9Sourcing:
DCpowe...[阅读全文]
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how to anti-interference with the low voltage or current signal
(2006-05-29 06:51:10)
Therearemanysensorstobemeasoduredtheoutsidewordenvirment,thesensormustbeamplified,filtertothestandardcurrentorvoltage,thatcanbeconnectedtothestandardA/Dmodules,howtoreducetheinterference,pleasereferencethefollowingitems:1usetheshieldedcable,andconnecttheshieldcableatthesensorside.2leavethecablefarawaywiththehighcurrentcable3donotgroundthesignaltobothside.4avoiddestroythecable.[阅读全文]
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Money not enough?
(2006-05-03 06:57:27)
Peoplealwaysthinkthemoneyisnotenough Therearesomereasonforhavemoremoney: 1Havemuchmoremoney,havesafety. 2Eatgoodfood,wearniceclothes. 3livingabighouse 4gotrespectfromtheothers 5gotmoretimeandmoneytohaveaholiday [阅读全文]
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4 to 20 ma current transfer and sampling
(2006-04-22 00:13:08)
Therearemanynaturalvariablethatchangingveryslowly,likeforce,temprature,distance,allthissignalcanbesensingbyanaloguesignal,afteramplying,filter,signalconditioning,normallyitbecomethestandardsignal,hemostcommomis4to20masignal,therearetwotype4to20masignal 1Thesignalcomefrominstruments,sothatmeansthepositiveandnegativesignalallishanging,veryeasygotinterference.couldnottransferlonger.canconnecttoprint...[阅读全文]
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how to find where is trip place of the machine
(2006-04-12 06:30:18)
Sometimeswhenyouswitchonthemachine,thepowerideateliytrip,ifthishappened,whatwillyoudo: 1checkiftheneturalcableconnecttotheground. 2checkiftheinsulationofthebracket,iftheregotwetornot,blowwithhotair,andmakeitdry,tryagain. 3switchoffalltheswitch,thenswitchonthemainpowerfirst,thenonebyonetoswitchontheswitch,checkandfindoutwhichistheproblem.[阅读全文]
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How to Identify the interference of the instrumnets
(2006-04-12 06:24:41)
Thereisaproblemwiththeinstrumentsthathaveainterfernece,inordertosolvetheproblem,Itrytochangethesensor,Ifoundthattheinterferenceisdisappear. sothatisthebestwaytodistiguisewhereisthesourceoftheinterference.itiscomefromthesensorortheinstrumets,sometimesinthesensorthereisanamplifierwithbattery,thatwillbeveryeasytobeinterference.[阅读全文]
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Writing report
(2006-04-12 06:15:16)
writingguide-31.1 31.WRITING Reportsarethemostcommonformofdocumentwrittenbyengineering.Report writingisanartthatweoftenoverlook,butinmanycasescanmakeadramaticimpacton howourworkisperceived.Yourreportsaremostlikelytofindtheirwaytoasuperiors deskthanyouaretomeettheindividual. 31.1FORGETWHATYOUWERETAUGHTBEFORE Inmyexperience,mostengineeringstudentshavebeenpreparedforpersuasive writing,butmany...[阅读全文]
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Electromagnetic
(2006-04-12 06:04:30)
electromagnetics-23.1
23.ELECTROMECHANICALSYSTEMS
23.1INTRODUCTION
•Magneticfieldsandforcesareextremelyuseful.Thefieldscanallowenergystorage,
ortransmitforces.
•
23.2MATHEMATICALPROPERTIES
•Magneticfieldshavedirection.Asaresultwemustpayspecialattentiontodirections,
andvectorcalculations.
23.2.1Induction
•Magneticfieldspassthroughspace...[阅读全文]
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