Dab tsi yog qhov txawv ntawm inverter overload thiab overcurrent?Overload yog ib lub tswv yim ntawm lub sij hawm, uas txhais tau hais tias lub load tshaj lub rated load los ntawm ib tug tej yam ntau yam nyob rau hauv ib tug tas mus li lub sij hawm.Lub tswv yim tseem ceeb tshaj plaws ntawm overload yog lub sijhawm tas mus li.Piv txwv li, lub peev xwm overload ntawm ib zaus converter yog 160% rau ib feeb, uas yog, tsis muaj teeb meem uas lub load nce mus txog 1.6 npaug rau rated load rau ib feeb tsis tu ncua.Yog hais tias lub load dheev ua me me nyob rau hauv 59 vib nas this, ces lub tswb overload yuav tsis tshwm sim.Tsuas yog tom qab 60 vib nas this, lub tswb ceeb toom yuav tshwm sim.Overcurrent yog ib lub tswv yim ntau, uas yog hais txog pes tsawg zaus lub load dheev tshaj qhov ntsuas load.Lub sij hawm ntawm overcurrent yog luv heev, thiab ntau yam yog loj heev, feem ntau ntau tshaj kaum los yog kaum ob lub sij hawm.Piv txwv li, thaum lub cev muaj zog khiav, cov neeg kho tshuab ncej yog dheev thaiv, ces tam sim no ntawm lub cev muaj zog yuav nce sai heev nyob rau hauv ib lub sij hawm luv luv, ua rau overcurrent tsis ua hauj lwm.
Tshaj-tam sim no thiab overload yog feem ntau ua txhaum ntawm zaus converters.Txhawm rau paub qhov txawv ntawm qhov hloov pauv zaus yog dhau mus dhau tam sim no lossis dhau mus dhau, peb yuav tsum ua ntej kom meej qhov txawv ntawm lawv.Feem ntau hais lus, overload yuav tsum dhau-tam sim no, tab sis vim li cas thiaj li yuav tsum tau hloov pauv zaus cais dhau-tam sim no los ntawm overload?Muaj ob qhov sib txawv tseem ceeb: (1) cov khoom tiv thaiv sib txawv Overcurrent feem ntau yog siv los tiv thaiv cov zaus hloov pauv, thaum overload feem ntau yog siv los tiv thaiv lub cev muaj zog.Vim hais tias lub peev xwm ntawm lub zaus hloov pauv qee zaum yuav tsum tau nce los ntawm ib lub iav lossis ob lub zog ntau dua li lub peev xwm ntawm lub cev muaj zog, qhov no, thaum lub cev muaj zog dhau, lub zaus hloov pauv tsis tas yuav dhau mus.Kev tiv thaiv overload yog ua los ntawm cov hluav taws xob thermal tiv thaiv muaj nuj nqi hauv cov zaus hloov pauv.Thaum cov khoom siv hluav taws xob tiv thaiv hluav taws xob tau teeb tsa ua ntej, "kev siv tam sim no" yuav tsum tau teeb tsa kom raug, uas yog, feem pua ntawm qhov piv ntawm cov ntsuas tam sim no ntawm lub cev muaj zog rau cov ntsuas tam sim no ntawm qhov hloov pauv zaus: IM% = IMN * 100 % I/IM Qhov twg, im% - tam sim no siv piv;IMN — ntsuas tam sim no ntawm lub cev muaj zog, a;IN — ntsuas tam sim no ntawm zaus converter, a.(2) Qhov kev hloov pauv tam sim no yog qhov sib txawv Overload tiv thaiv tshwm sim hauv kev ua haujlwm ntawm cov tshuab tsim khoom, thiab qhov hloov pauv tam sim no di / dt feem ntau yog me me;Overcurrent uas tsis yog overload feem ntau yog tam sim no, thiab qhov hloov pauv ntawm di / dt tam sim no feem ntau loj.(3) Kev tiv thaiv overload muaj lub sijhawm hloov pauv.Kev tiv thaiv overload feem ntau tiv thaiv lub cev los ntawm overheating, yog li nws muaj cov yam ntxwv ntawm "hloov lub sijhawm txwv" zoo ib yam li thermal relay.Qhov ntawd yog hais tias, yog tias nws tsis ntau tshaj li qhov ntsuas tam sim no, lub sijhawm tso cai khiav tau ntev dua, tab sis yog tias nws ntau dua, lub sijhawm tso cai khiav yuav luv.Tsis tas li ntawd, raws li qhov zaus txo qis, cov cua kub dissipation ntawm lub cev muaj zog zuj zus.Yog li ntawd, nyob rau hauv tib lub overload ntawm 50%, qhov tsawg zaus, lub sij hawm ua hauj lwm luv dua.
Overcurrent mus txawv tebchaws ntawm zaus converter Over-tam sim no tripping ntawm inverter yog muab faib ua short-circuit txhaum, tripping thaum lub sij hawm ua hauj lwm thiab tripping thaum acceleration thiab deceleration, thiab lwm yam. 1, luv Circuit Court txhaum: (1) Fault yam ntxwv (a) Thawj qhov kev mus ncig yuav tshwm sim thaum lub sijhawm ua haujlwm, tab sis yog tias nws rov pib dua tom qab pib dua, nws yuav nquag mus ncig sai li sai tau thaum lub nrawm nce.(b) Nws muaj lub zog loj tam sim no, tab sis feem ntau zaus hloov pauv tau muaj peev xwm ua kom muaj kev tiv thaiv tripping yam tsis muaj kev puas tsuaj.Vim tias kev tiv thaiv mus ncig sai heev, nws yog qhov nyuaj rau kev soj ntsuam nws tam sim no.(2) Kev txiav txim thiab tuav Thawj kauj ruam yog txiav txim seb puas muaj luv luv Circuit Court.Txhawm rau ua kom yooj yim rau kev txiav txim siab, lub voltmeter tuaj yeem txuas nrog rau sab tswv yim tom qab pib dua thiab ua ntej rov pib dua.Thaum rov pib dua, lub potentiometer yuav tig maj mam los ntawm xoom, thiab tib lub sijhawm, xyuam xim rau lub voltmeter.Yog hais tias qhov tso zis zaus ntawm lub inverter mus ncig ua si sai li sai tau thaum nws nce, thiab lub pointer ntawm lub voltmeter qhia cov cim ntawm rov qab mus rau "0" tam sim ntawd, nws txhais tau hais tias cov zis kawg ntawm lub inverter tau luv luv los yog hauv av.Qhov thib ob kauj ruam yog txiav txim seb lub inverter yog luv luv-circuited sab hauv lossis sab nraud.Lub sijhawm no, kev sib txuas ntawm qhov kawg ntawm cov khoom siv zaus hloov pauv yuav tsum raug txiav, thiab tom qab ntawd lub potentiometer yuav tsum tig los ua kom qhov zaus.Yog hais tias nws tseem mus txawv tebchaws, nws txhais tau hais tias lub zaus converter yog luv luv;Yog tias nws tsis rov mus dua, nws txhais tau hais tias muaj luv luv Circuit Court sab nraum lub zaus converter.Xyuas cov kab ntawm lub zaus converter mus rau lub cev muaj zog thiab lub cev muaj zog nws tus kheej.2, lub teeb load overcurrent load yog lub teeb heev, tab sis overcurrent tripping: Qhov no yog qhov tshwm sim tshwj xeeb ntawm kev hloov pauv ceev ceev.Nyob rau hauv hom V / F tswj, muaj ib qho teeb meem tseem ceeb: qhov tsis ruaj khov ntawm lub cev muaj zog sib nqus hluav taws xob thaum lub sijhawm ua haujlwm.Lub hauv paus yog vim li cas nyob rau hauv: Thaum khiav ntawm tsawg zaus, thiaj li yuav tsav ib tug hnyav load, torque them feem ntau yuav tsum tau (uas yog, kev txhim kho lub U / f ratio, kuj hu ua torque boost).Lub saturation degree ntawm lub cev muaj zog magnetic Circuit Court hloov nrog lub load.Qhov kev mus ncig tam sim no tshwm sim los ntawm kev ua kom lub cev muaj zog sib nqus hluav taws xob feem ntau tshwm sim ntawm qhov tsawg zaus thiab lub teeb load.Kev daws: Kho qhov U / f piv dua.3, overload overcurrent: (1) Fault phenomenon Qee lub tshuab tsim khoom dheev nce lub load thaum lub sijhawm ua haujlwm, lossis txawm tias "tau daig".Qhov ceev ntawm lub cev muaj zog poob qis vim qhov tsis tuaj yeem ntawm txoj siv, qhov tam sim no nce nrawm, thiab kev tiv thaiv overload yog lig dhau los ua, ua rau overcurrent tripping.(2) Kev daws (a) Ua ntej, xyuas seb lub tshuab nws tus kheej puas yog, thiab yog tias nws yog, kho lub tshuab.(b) Yog tias qhov overload no yog qhov tshwm sim tshwm sim hauv cov txheej txheem tsim khoom, ua ntej xav txog seb qhov sib kis ntawm lub cev muaj zog thiab lub nra tuaj yeem nce ntxiv?Tsim nyog nce qhov sib kis tau zoo tuaj yeem txo qhov tsis kam torque ntawm lub cev muaj zog thiab zam qhov xwm txheej ntawm txoj siv immobility.Yog tias qhov sib kis tsis tuaj yeem nce ntxiv, lub peev xwm ntawm lub cev muaj zog thiab zaus hloov pauv yuav tsum tau nce ntxiv.4. Tshaj tam sim no thaum lub sij hawm acceleration los yog deceleration: Qhov no yog tshwm sim los ntawm acceleration los yog deceleration ceev heev, thiab cov kev ntsuas uas yuav tsum tau raws li nram no: (1) ncua lub acceleration (deceleration) lub sij hawm.Ua ntej, nkag siab seb nws puas raug tso cai kom ncua lub sijhawm nrawm lossis ncua sijhawm raws li cov txheej txheem tsim khoom.Yog tias tso cai, nws tuaj yeem txuas ntxiv.(2) Ua kom raug kwv yees qhov nrawm nrawm (deceleration) kev kho tus kheej (kev tiv thaiv lub hauv paus) muaj nuj nqi Lub inverter muaj kev kho tus kheej (kev tiv thaiv qhov rooj) muaj nuj nqi rau overcurrent thaum acceleration thiab deceleration.Thaum qhov nce (poob) tam sim no tshaj qhov preset sab sauv txwv tam sim no, qhov nce (poob) nrawm yuav raug ncua, thiab tom qab ntawd qhov nce (poob) nrawm yuav txuas ntxiv thaum tam sim no poob qis dua tus nqi teev.
Overload mus txawv tebchaws ntawm zaus converter Lub cev muaj zog tuaj yeem tig tau, tab sis qhov khiav tam sim no tshaj qhov ntsuas tus nqi, uas yog hu ua overload.Cov tshuaj tiv thaiv tseem ceeb ntawm overload yog tias txawm tias tam sim no tshaj qhov ntsuas tus nqi, qhov loj ntawm qhov ntau dhau tsis loj, thiab feem ntau nws tsis tsim qhov cuam tshuam loj tam sim no.1, lub ntsiab yog vim li cas ntawm overload (1) mechanical load yog hnyav heev.Lub ntsiab feature ntawm lub overload yog lub cev muaj zog generates tshav kub, uas yuav nrhiav tau los ntawm kev nyeem cov khiav tam sim no ntawm cov zaub screen.(2) Qhov tsis sib npaug ntawm peb-theem hluav taws xob ua rau qhov kev khiav hauj lwm tam sim no ntawm qee theem loj heev, ua rau overload tripping, uas yog tus cwj pwm los ntawm cov cua kub tsis sib haum ntawm lub cev muaj zog, uas yuav tsis pom thaum nyeem cov khoom siv tam sim no los ntawm cov zaub. npo (vim lub vijtsam zaub tsuas pom ib theem tam sim no).(3) Kev ua haujlwm tsis zoo, qhov kev tshawb pom tam sim no hauv lub inverter tsis ua haujlwm, thiab cov teeb liab pom tam sim no loj dhau, ua rau muaj kev poob qis.2. Kev tshuaj xyuas txoj kev (1) Xyuas seb lub cav puas kub.Yog hais tias qhov kub ntawm lub cev muaj zog tsis siab, ua ntej ntawm tag nrho cov, xyuas seb cov hluav taws xob thermal tiv thaiv muaj nuj nqi ntawm lub zaus converter puas yog preset.Yog tias qhov hloov pauv zaus tseem muaj qhov seem, tus nqi preset ntawm hluav taws xob tiv thaiv thermal muaj nuj nqi yuav tsum tau so.Yog hais tias qhov kub thiab txias ntawm lub cev muaj zog yog siab dhau thiab lub overload yog ib txwm, nws txhais tau hais tias lub cev muaj zog yog overloaded.Nyob rau lub sijhawm no, peb yuav tsum ua ntej nce qhov sib kis tau zoo kom txo tau cov load ntawm lub cev muaj zog.Yog tias nws tuaj yeem nce ntxiv, nce qhov sib kis.Yog tias qhov sib kis tsis tuaj yeem nce ntxiv, lub peev xwm ntawm lub cev yuav tsum tau nce ntxiv.(2) Xyuas seb qhov peb-theem voltage ntawm lub cev muaj zog yog sib npaug.Yog hais tias peb-theem voltage ntawm lub cev muaj zog tsis sib npaug, xyuas seb qhov peb-theem voltage ntawm qhov tso zis kawg ntawm zaus converter yog sib npaug.Yog tias nws tseem tsis sib npaug, qhov teeb meem nyob hauv qhov hloov pauv zaus.Yog hais tias qhov hluav taws xob ntawm qhov kawg ntawm qhov kev hloov pauv zaus yog qhov sib npaug, qhov teeb meem nyob hauv kab ntawm lub zaus converter mus rau lub cev muaj zog.Xyuas seb cov screws ntawm tag nrho cov terminals raug nruj.Yog tias muaj cov contactors lossis lwm yam khoom siv hluav taws xob nruab nrab ntawm lub zaus hloov pauv thiab lub cev muaj zog, xyuas seb cov terminals ntawm cov khoom siv hluav taws xob puas raug nruj thiab seb qhov kev sib cuag ntawm cov neeg sib cuag puas zoo.Yog hais tias peb-theem voltage ntawm lub cev muaj zog yog sib npaug, koj yuav tsum paub qhov ua hauj lwm zaus thaum tripping: Yog hais tias qhov kev ua hauj lwm zaus yog tsawg thiab vector tswj (los yog tsis muaj vector tswj), qhov U / f ratio yuav tsum tau txo ua ntej.Yog hais tias lub load tseem tuaj yeem tsav tom qab qhov txo qis, nws txhais tau hais tias qhov qub U / f piv yog siab dhau lawm thiab cov nqi siab tshaj plaws ntawm qhov excitation tam sim no loj dhau, yog li tam sim no tuaj yeem txo los ntawm kev txo qhov U / f ratio.Yog tias tsis muaj qhov ruaj khov tom qab txo qis, peb yuav tsum xav txog kev nce lub peev xwm ntawm inverter;Yog hais tias lub inverter muaj vector tswj muaj nuj nqi, vector tswj hom yuav tsum tau saws.
Disclaimer: Cov kab lus no tau muab luam tawm los ntawm lub network, thiab cov ntsiab lus ntawm tsab xov xwm tsuas yog siv rau kev kawm thiab kev sib txuas lus.Cov cua compressor network yog nruab nrab rau cov kev xav hauv kab lus.Txoj cai ntawm tsab xov xwm belongs rau tus thawj sau thiab lub platform.Yog tias muaj kev ua txhaum cai, thov hu rau tshem tawm.