Variable-frequency Drive (VFD) feem ntau muaj qhov tsis tsim nyog kaw thaum lub sijhawm ua haujlwm, uas cuam tshuam rau peb cov kab ntau lawm. Thaum peb tshawb xyuas txhua qhov ua tau, peb tseem tsis pom muaj teeb meem. Tom qab ntawd, tom qab kev sab laj cov chaw tsim khoom inverter, nws tau pom tias nws yuav yog ib qho teeb meem ntawm kev siv fais fab. Nws raug nquahu kom peb xyuas nws ua ntej.
Vim hais tias lub hauv paus ntsiab lus ntawm VFD yog muab cov kev cai voltage thiab zaus tswj fais fab mov rau asynchronous motors kom tau raws li lub zog txuag los yog cov txheej txheem yuav tsum tau, nws muaj peb yam: rectifier, DC thiab inverter. Yog tias qhov hluav taws xob sab nraud tsis ruaj khov, DC qhov hluav taws xob yuav poob, ua rau nws tsis yooj yim rau VFD ib feem kom tsis tu ncua tso tawm qhov teeb tsa voltage, ua rau VFD tiv thaiv nres.
Thaum lub sijhawm tshawb nrhiav, peb tau saib xyuas lub zog nkag ntawm VFD nrog lub tshuab ntsuas hluav taws xob zoo li ntawm ib nrab ib hlis. Nws hloov tawm tias qhov zoo ntawm cov khoom siv hluav taws xob cuam tshuam rau kev ua haujlwm ntawm VFDs.
Tom qab soj ntsuam ib pliag, nws pom tias VFD tam sim ntawd nres. Saib ntawm cov ntaub ntawv sau tseg los ntawm lub tshuab hluav taws xob ntsuas hluav taws xob zoo, nws yog qhov tseeb tias muaj qhov poob qis heev nyob rau tib lub sijhawm thaum kaw, uas tau poob los ntawm yuav luag 80%. Los ntawm qhov no, peb tuaj yeem txiav txim siab tias qhov kev kaw yog tshwm sim los ntawm qhov voltage dips.
Thaum kawg ntawm tsab xov xwm, ntau qhov laj thawj vim li cas VFDs yuav raug kaw yog qhia:
1. Txawm hais tias lub hwj huam mov voltage yog qhov qub, siab dhau lossis qis dhau yuav ua rau kaw.
2. Txawm hais tias qhov kev teeb tsa parameter yog qhov tseeb, qee zaum, xws li cov dej ntws tsis tu ncua, thaum lub hom phiaj siab mus txog, lub tshuab yuav cia li nres thiab rov pib dua, uas yog qhov qub.
3. Txawm hais tias muaj ntau yam kev sib haum xeeb hauv cov khoom siv hluav taws xob, uas yuav tsum tau kuaj xyuas nrog lub hwj chim zoo analyzer lossis handheld oscilloscope.
4. VFD kho vajtse tsis ua hauj lwm. Piv txwv li, kho vajtse tsis ua hauj lwm xws li contactors.