Thaum lub zaus converter qhia qhov "LU" txhaum cai, nws feem ntau qhia tau hais tias "Low Voltage" txhaum, lub ntsiab lus ntawm lub zog hluav taws xob input voltage yog qis dua qhov tsawg kawg nkaus uas yuav tsum tau ua rau kev ua haujlwm ib txwm muaj. Qhov kev ua txhaum no tuaj yeem tshwm sim los ntawm ntau yam thiab yuav tsum tau ua kauj ruam - los ntawm - kauj ruam daws teeb meem raws li cov xwm txheej tiag tiag. Hauv qab no yog cov ncauj lus kom ntxaws tsom xam thiab kev daws teeb meem:
I. Fault Cause Analysis
1. Cov tswv yim fais fab tsis zoo
● Tsis ruaj tsis khov daim phiaj voltage:Sudden mains voltage drops, peb -theem imbalance, los yog overvoltage fluctuations tej zaum yuav ua rau lub inverter mus ntes tsis tshua muaj voltage.
● Tsis muaj theem nyob rau hauv lub hwj chim mov:Rau peb -theem inverters, ib ntus so lossis kev sib cuag tsis zoo tuaj yeem ua rau lub tswb nrov LU vim yog qhov hluav taws xob tsis txaus.
● Cov Teeb Meem Hluav Taws Xob:Cov kab hluav taws xob xoob xoob, cov khoom siv hluav taws xob oxidized, lossis tsis txaus cable hla - ntu ntu ua rau muaj hluav taws xob ntau dhau.
2. Internal Inverter teeb meem
● Tsawg DC Bus Voltage:Cov laus rectifier modules los yog lim capacitors tsis ua kom ruaj khov DC voltage.
● Voltage detection Circuit Court tsis ua hauj lwm:Kev puas tsuaj sampling resistors los yog teeb liab kis tsis zoo ua rau tsis muaj tseeb - lub tswb nrov.
● Main tswj board malfunction:Processor lossis AD hloov dua siab tshiab module yuam kev ua rau tsis raug voltage nyeem ntawv.
3. Load lossis Parameter Configuration Teeb meem
● Sudden load surge:Ntau dhau tam sim no tam sim no thaum lub cev muaj zog pib lossis acceleration rub down input voltage (tshwj xeeb tshaj yog nyob rau hauv cov kab sib chaws tsis muaj zog).
● Kev teeb tsa tsis raug:Piv txwv li, tsis tshua muaj hluav taws xob tiv thaiv qhov pib (piv txwv li, 80% ntawm qhov ntsuas hluav taws xob) tau teeb tsa siab dhau lawm, lossis lub sijhawm deceleration luv luv ua rau tsis txaus tawm tswv yim voltage.
II. Kev daws teeb meem thiab cov kauj ruam daws teeb meem
1. Tshawb xyuas lub zog nkag
● Ntsuas input voltage:Siv ib lub ntsuas ntsuas los ntsuas peb -theem voltage ntawm lub inverter input terminals. Feem ntau yuav tsum tsis pub dhau ± 10% ntawm qhov ntsuas hluav taws xob (xws li 342-418V rau 380V qhov system). Yog hais tias qhov hluav taws xob tseem tsis tshua muaj qis, hu rau lub hwj chim hluav taws xob los yog nruab ib lub zog stabilizer.
● Tshawb xyuas cov theem poob:Txheeb xyuas qhov sib npaug peb -theem voltage, nrog rau ob qho -theem voltage qhov sib txawv tsis tshaj 2%. Tshawb xyuas Circuit Court breakers, contactors, thiab xaim rau theem poob.
● Kev ruaj ntseg thaiv:Txhim kho lub zog hluav taws xob thiab tshuaj xyuas cov kab hluav taws xob rau kev laus lossis tsis txaus hla - cheeb tsam (kev pom zoo xov hlau ntsuas: 1.2 npaug ntawm qhov ntsuas hluav taws xob tam sim no).
2. Tshawb xyuas Drive Hardware
● DC Bus Voltage:Ntsuas DC tsheb npav voltage thaum kaw (feem ntau yog 1.35 zaug input kab voltage; piv txwv li, ~ 513V rau 380V input). Yog tias txawv txav, tshawb xyuas cov txuas txuas hluav taws xob thiab cov lim dej kom pom cov pa tawm los yog bulging.
● Voltage detection Circuit Court:Muaj tus kws tshaj lij uas tsim nyog tshawb xyuas cov khoom ntawm PCB pawg thawj coj saib, xws li cov qauv ntsuas hluav taws xob thiab cov optocouplers, rau kev puas tsuaj.
● Main tswj board raws li txoj cai:Txheeb xyuas qhov kub hnyiab lossis tawg capacitors; hloov lossis kho raws li qhov tsim nyog.
3. Kho qhov ntsuas thiab thauj khoom
● Hloov Kho Kev Tiv Thaiv Kev Tiv Thaiv:Tsim nyog txo qis -voltage tiv thaiv tus nqi (piv txwv li, los ntawm 80% mus rau 70%), kom ntseeg tau tias nws tsis cuam tshuam rau kev ua haujlwm nyab xeeb.
● Nthuav Lub Sijhawm Ua Si / Lub Sijhawm Deceleration:Txo cov hluav taws xob tam sim no kom tsis txhob muaj hluav taws xob poob.
● Kos Load Inertia:Rau siab -inertia loads (xws li, kiv cua, twj), pab kom "voltage them" muaj nuj nqi los yog nruab ib lub braking resistor.
4. Ib puag ncig thiab cov cuab yeej pabcuam
● Tsis txhob muab cov peev txheej sib koom:Cais fais fab mov rau siab - khoom siv fais fab (xws li, vuam, cranes) thiab inverters los tiv thaiv kev cuam tshuam ntawm hluav taws xob.
● Nruab Reactors:Lub AC reactor nyob rau sab input suppresses voltage fluctuations, thaum cov zis -sab reactor txo cov teebmeem harmonic.
III. Reference Case Studies
1. Case 1:Ib lub Hoobkas VFDs nquag tshaj tawm LU ua txhaum. Kev tshuaj xyuas tau pom daim phiaj hluav taws xob poob rau 340V (rated 380V) thaum hmo ntuj. Kev txhim kho ntawm qhov tsis siv neeg voltage regulator daws qhov teeb meem.
2. Case 2:A VFD misreported LU tom qab lub ntsiab tswj board hloov. Qhov txhaum yog thaum kawg taug mus rau drift nyob rau hauv voltage sampling resistor tus nqi. Ib txwm ua haujlwm rov pib dua tom qab hloov.
3. Case 3:Ib txoj siv conveyor VFD ua rau lub tswb thaum lub sijhawm nrawm. Txuas lub sij hawm acceleration ntawm 5 mus rau 10 vib nas this thiab ua rau "voltage tiv thaiv" muaj nuj nqi tshem tawm qhov txhaum.
IV. Kev Tiv Thaiv Kev Tiv Thaiv
● Kev tu tsis tu ncua:Ntxuav cov kiv cua txias thiab tshuaj xyuas lub peev xwm capacitor los tiv thaiv qhov tsis zoo ntawm qhov hluav taws xob tshwm sim los ntawm cov khoom qub.
● Tiag -Lub Sijhawm Saib Xyuas:Nruab cov ntsuas hluav taws xob los sau cov ntaub ntawv keeb kwm voltage hloov pauv.
● Redundancy Design:Siv ob lub zog hloov pauv lossis UPS thaub qab lub zog rau cov khoom siv tseem ceeb.
Yog tias cov kauj ruam saum toj no tsis daws qhov teeb meem, hu rau VFD cov chaw tsim khoom lossis cov neeg ua haujlwm tu neeg ua haujlwm kom tsis txhob ua rau qhov txhaum loj dua los ntawm kev tuav tsis raug. LU cov lej yuav txawv me ntsis hla cov VFD hom sib txawv (xws li, ABB txhais nws li "Undervoltage"). Saib rau tus qauv tshwj xeeb phau ntawv qhia kom raug txhais.