外文翻译、中英文翻译——电力绞车的控制

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1、外文翻译、中英文翻译——电力绞车的控制英文原文ElectricalWinchControlsbyTomYoungTheformofmotorcontrolweallknowbestisthesimplemanualstationwithupanddownpushbuttons.Whilethesestationsmaystillbetheperfectchoiceforcertainapplications，adizzyingarrayofmoresophisticatedcontrolsisalsoavailable.Thisarticleaddressesth

2、ebasicelectricalrequirementsofthemotorsanduserinterfaceissuesyouwillneedtoaddressbeforespcifying，buildingorbuyingwinchcontrols.beginwith，themanualcontrolstationsshouldbeofthehold-to-runtype，sothatifyoutakeyourfingeroffofthebuttonthewinchstops.Additionally，everycontrolstationneedsaneme

3、rgencystopE-stopthatkillsallpowertothewinch，notjustthecontrolcircuit.Thinkaboutit―ifthewinchisn’tstoppingwhenitshould，youreallyneedafailsafewaytokillthelinepower.It’salsoagreatideatohaveakeyoperatedswitchoncontrolstations，especiallywhereaccesstothestationsisnotcontrolled.Safeoperation

4、byauthorizedpersonnelmustbeconsideredwhendesigningeventhesimplestmanualcontrols.ControllingFixedSpeedMotorsTheactualcontrollingdeviceforafixedspeedwinchisathreephasereversingstarter.ThemotorisreversedbysimplyswitchingthephasesequencefromABCtoCBA.Thisisaccomplishedbytwothree-polecontac

5、tors，interlocked，sotheycan’tbothbeclosedatthesametime.TheNECrequiresbothoverloadandshortcircuitprotection.Toprotectthemotorfromoverheatingduetomechanicaloverloadsathermaloverloadrelayisbuiltintothestarter.Thishasbi-metallicstripsthatmatchtheheatingpatternofthemotorandtripscontactswhen

6、theyoverheat.Alternatively，athermistorcanbemountedinthemotorwindingtomonitorthemotortemperature.Shortcircuitprotectionisgenerallyprovidedbyfusesratedforusewithmotors.Aseparatelinecontactorshouldbeprovidedaheadofthereversingcontactorforredundancy.Thiscontactoriscontrolledbythesafetycir

7、cuits:E-stopandovertravel　limits.Thisbringsustolimitswitches.Whenyougettothenormalendoftravellimitthewinchstopsandyoucanonlymoveitintheoppositedirectionawayfromthelimit.Therealsoneedstobeanovertravellimitincase，duetoanelectricalormechanicalproblem，thewinchrunspastthenormallimit.Ifyouh

8、itano