Yuav ua li cas tshwm sim thaum VFD ua tsis tiav thiab koj pom nws kaw vim muaj kev kub ntxhov dhau? Lub sijhawm ntawd, kev nkag siab zoo txog qhov ua rau qhov no tshwm sim yuav yog cov ntaub ntawv tseem ceeb raws li koj lub hom phiaj yog kom tau VFD rov qab online.
Ib qho overvoltage txhaum tshwm sim nyob rau hauv cov tub ntxhais thaum lub voltage ntsuas ntawm tus tsav DC tsheb npav siab tshaj qhov predetermined overvoltage mus txawv tebchaws point. Thaum qhov no tshwm sim, VFD tiv thaiv ncaws tawm thiab yuav coj nws offline vim yog qhov txhaum.
Qhov no feem ntau yog qhia los ntawm qhov kev tshuaj ntsuam txhaum cai xws li "oV" lossis "F05" nyob ntawm qhov ua rau tsav. Qhov no yuav tshwm sim thaum peb delve rau hauv overvoltage faults:
Load Deceleration
- Thaum lub cev muaj zog pib decelerate (xav txog kev siv lub brakes hauv koj lub tsheb), nws xa lub zog rov qab mus rau tus tsav, qhov twg nws yog dissipated los ntawm tus tsav lub braking circuits los yog los ntawm ib tug active pem hauv ntej kawg nyob rau hauv ib tug regenerative daim ntawv thov.
- Thaum lub sij hawm braking luv luv thiab lub load muaj ntau dhau inertia, lub zog loj dua yuav rov qab mus rau tus tsav, ua rau qhov hluav taws xob ntawm lub tsheb npav nce, ua rau muaj kev cuam tshuam overvoltage.
- Thaum koj tau txiav txim siab tias qhov no yog qhov ua txhaum cai, ib cheeb tsam xav txog kev hloov kho yog lub sijhawm deceleration. Los ntawm kev ua kom lub sij hawm deceleration, koj tab tom nthuav tawm lub zog dissipation thiab muab lub sijhawm VFD ntxiv kom nqus tau qhov nce hauv qhov hluav taws xob rov qab.
- Yog tias qhov no tsis yog qhov kev xaiv, koj tuaj yeem saib mus rau hauv txoj hauv kev los txo cov load ntawm lub cev muaj zog. Qhov no yuav cuam tshuam rau qhov hluav taws xob regenerative vim tias thaum lub load txo, lub zog yuav tsum tau nres lub load kuj txo.
- Yog tias ib qho ntawm cov kev xaiv no tsis muaj, koj tuaj yeem ntxiv braking resistors rau tus tsav uas yuav pab nqus cov voltages thiab tiv thaiv VFD los ntawm kev puas tsuaj los ntawm cov hluav taws xob regenerative.
Input Power Peaks
- Lub hwj chim uas pub koj VFD yuav muaj kev cuam tshuam rau koj VFD thiab koj yuav tsum paub seb yuav nrhiav dab tsi. Qhov no feem ntau yog lub luag haujlwm ntawm cov khoom siv hluav taws xob uas ua rau koj lub chaw ua haujlwm, lossis nws tuaj yeem los ntawm lwm qhov hauv koj lub chaw.
- Thaum koj txiav txim siab tias qhov no yog qhov ua rau tsis ua haujlwm, nws yog lub sijhawm los nqis tes ua. Los ntawm kev ntxiv ib qho input reactor rau kab sab ntawm koj VFD, koj tuaj yeem pab tiv thaiv koj cov cuab yeej los ntawm cov surges no.
- Txoj hauv kev zoo tshaj plaws kom tsis txhob muaj qhov no yog saib xyuas lub zog tawm tswv yim los ntawm kev siv hluav taws xob. Qhov no yuav yog qhov qhia meej yog tias qhov teeb meem tshwm sim los ntawm kev siv hluav taws xob nws tus kheej, lossis los ntawm lwm qhov hauv qhov chaw.
Kev hloov pauv ceev ceev
- Feem ntau, thaum tib neeg teeb meem VFDs, lawv siv tag nrho lawv lub sijhawm ntawm tus tsav nws tus kheej thiab tsis muaj sijhawm txaus los ntsuas lub nra. Load muaj qhov cuam tshuam loj heev ntawm VFD ua haujlwm li cas, thiab yog tias nws hloov pauv sai, lub zog spikes tuaj yeem tshwm sim ntawm lub kaw lus. Qhov no tuaj yeem tshwm sim los ntawm ib yam dab tsi ntxiv lossis tshem tawm ntawm lub kaw lus uas VFD tab tom sim them rau.
- Nyob rau hauv cov ntaub ntawv no, lub cev muaj zog tej zaum yuav muaj ntau slippage raws li lub cev muaj zog sim mus ntes nrog lub synchronous ceev. Nyob rau hauv lub xeev no, lub system siv zog ntau dua.
- Txhawm rau kho cov teeb meem no, xyuas kom tseeb tias cov khoom sib txuas ntawm lub cev muaj zog tsis yog khi los yog swb.
- Qhov no yog ib txoj hauv kev zoo los kuaj xyuas ob zaug thiab xyuas kom tseeb tias VFD raug ntsuas rau daim ntawv thov.
Teeb meem hauv av
- Muaj cov khoom siv hauv av rau ntau yam khoom siv hluav taws xob yog qhov tseem ceeb rau kev ua neej ntev thiab kev ntseeg tau.
- Yog hais tias lub hauv av ntab yog tam sim no lossis yog tias cov av tsis raug ntsia zoo txij thaum pib, koj tuaj yeem pib ntsib overvoltage faults.
- Yog tias cov av tsis raug teeb tsa kom raug, nws tuaj yeem ua kom muaj zog thiab tsis tshem tawm qhov tsis xav tau dissipated voltage, ua rau muaj qhov overvoltage.
- Txhawm rau kom paub tseeb tias qhov no tsis yog qhov teeb meem, siv sijhawm los txheeb xyuas cov av hauv av nrog kev sim nrawm nrog lub voltmeter. Qhov hluav taws xob yuav tsum tsis txhob muaj nyob rau hauv ib qho kev teeb tsa hauv av kom zoo, thiab yog tias qhov no tsis yog qhov teeb meem, koj yuav pom qhov ua txhaum cai uas yuav tsum tau kho.