Ndeupi musiyano uripo pakati pe inverter overload uye overcurrent?Overload ipfungwa yenguva, zvinoreva kuti mutoro unodarika mutoro wakayerwa neimwe yakawanda munguva inoenderera.Pfungwa inonyanya kukosha yekuremerwa inguva inoenderera.Semuyenzaniso, kuwanda kwehuwandu hweinoshandura frequency ndeye 160% kweminiti imwe, ndiko kuti, hapana dambudziko rekuti mutoro unosvika 1.6 nguva iyo yakayerwa mutoro kweminiti imwe ichienderera.Kana mutoro wacho ukangoerekana wava mudiki mumasekonzi makumi mashanu nepfumbamwe, ipapo alarm yekuremedza haizokonzereswa.Chete mushure memasekondi makumi matanhatu, iyo alarm yekuremedza ichatanga.Overcurrent ipfungwa yehuwandu, iyo inoreva kuti kangani mutoro unongoerekana wapfuura mutoro wakayerwa.Nguva ye overcurrent ipfupi kwazvo, uye iyo yakawanda yakakura kwazvo, kazhinji inodarika gumi kana kunyange makumi enguva.Semuenzaniso, kana mota ichimhanya, shaft yemagetsi inovharwa kamwe kamwe, ipapo ikozvino yemota ichasimuka nekukurumidza munguva pfupi, zvichitungamira mukutadza kwepamusoro.
Kupfuura-ikozvino uye kuwandisa ndizvo zvinowanzoitika kukanganisa kwema frequency converters.Kuti tisiyanise kana frequency converter iri pamusoro-ikozvino kutsika kana kuremerwa, tinofanira kutanga tajekesa musiyano uripo pakati pawo.Kazhinji kutaura, kuwandisa kunofanirawo kunge kuri pamusoro-ikozvino, asi nei frequency converter ichifanira kupatsanura pamusoro-ikozvino kubva pakuremerwa?Pane misiyano miviri mikuru: (1) zvakasiyana kuchengetedza zvinhu Overcurrent inonyanya kushandiswa kuchengetedza frequency converter, nepo kuwandisa kunonyanya kushandiswa kuchengetedza mota.Nekuti huwandu hweiyo frequency converter dzimwe nguva inoda kuwedzerwa negiya rimwe chete kana maviri magiya pane kugona kwemota, mune iyi kesi, kana mota yaremerwa, iyo frequency converter haifanire kudarika.Kudzivirirwa kwekuremerwa kunoitwa neyemagetsi thermal kuchengetedza basa mukati meiyo frequency converter.Kana iyo yemagetsi thermal kuchengetedza basa rikagadzikwa, iyo "ikozvino kushandiswa ratio" inofanirwa kugadzikwa nemazvo, kureva kuti, chikamu chechiyero cheyakayerwa ikozvino yemota kune yakayerwa ikozvino ye frequency converter: IM% = IMN * 100. % I/IM Iko, im%-ikozvino kushandiswa kwechiyero;IMN--yakatemerwa ikozvino yemota, a;IN- yakayerwa ikozvino ye frequency converter, a.(2) Chiyero chekuchinja chezvino chakasiyana Kudzivirirwa kweKuwedzeredza kunoitika mukushanda kwemuchina wekugadzira, uye chiyero chekuchinja chezvino di/dt chinowanzo diki;Overcurrent kunze kwekuremerwa kazhinji inongoerekana yaerekana, uye shanduko yeazvino di/dt inowanzokura.(3) Dziviriro yakawandisa ine inverse nguva hunhu.Kudzivirirwa kwekuremerwa kunonyanya kudzivirira mota kubva pakupisa, saka ine hunhu hwe "inverse time limit" yakafanana neyekupisa relay.Izvi zvinoreva kuti, kana isiri yakawanda kudarika yakarongwa ikozvino, nguva inobvumirwa inomhanya inogona kuva yakareba, asi kana yakawanda, nguva inobvumirwa inopera ichapfupiswa.Mukuwedzera, sezvo kuwanda kunoderera, kupisa kwekupisa kwemotokari kunowedzera kuipa.Naizvozvo, pasi pekuremerwa kwakafanana kwe50%, iyo yakaderera frequency, ipfupi iyo inobvumidzwa yekumhanya nguva.
Overcurrent rwendo rwe frequency converter Over-current tripping of inverter yakakamurwa kuita short-circuit kukanganisa, kugumburwa panguva yekushanda uye kutsika panguva yekumhanyisa uye kudzikisira, etc. panguva yekushanda, asi kana ikatangazve mushure mekugadzirisazve, inowanzogumburwa nokukurumidza kana kukurumidza kusimuka.(b) Iyo ine yakakura yekuvhiya ikozvino, asi akawanda ma frequency converters akakwanisa kuita kudzivirira kutsika pasina kukuvara.Nekuti dziviriro inofamba nekukurumidza, zvinonetsa kuona zvazvino.(2) Kutonga uye kubata Danho rokutanga nderokutonga kana pane dunhu ripfupi.Kuti zvive nyore kutonga, voltmeter inogona kubatanidzwa kune chikamu chekuisa mushure mekugadzirisa zvakare uye isati yatangazve.Paunotangazve, potentiometer ichatendeuka zvishoma nezvishoma kubva kune zero, uye panguva imwechete, teerera kune voltmeter.Kana iyo inobuda frequency ye inverter inofamba ichingosimuka, uye chinongedzo che voltmeter chinoratidza zviratidzo zvekudzokera ku "0" ipapo, zvinoreva kuti iyo inobuda yekupedzisira ye inverter yakapfupika-yakatenderedzwa kana pasi.Nhanho yechipiri ndeyekutonga kana inverter iri pfupi-yakatenderedzwa mukati kana kunze.Panguva ino, kubatana pamagumo ekubuda kweiyo frequency converter kunofanirwa kubviswa, uye ipapo potentiometer inofanira kushandurwa kuti iwedzere kuwanda.Kana ichiri kufamba, zvinoreva kuti frequency converter ipfupi-inotenderera;Kana ikasatsika zvakare, zvinoreva kuti kune dunhu diki kunze kweiyo frequency converter.Tarisa mutsetse kubva kune frequency converter kune mota uye mota pachayo.2, light load overcurrent load yakareruka, asi overcurrent tripping: Ichi chiitiko chakasiyana chekusiyana frequency speed regulation.MuV / F control mode, pane dambudziko rakakurumbira: kusagadzikana kwemotor magnetic circuit system panguva yekushanda.Chikonzero chikuru chiri mu: Kana uchimhanya wakaderera frequency, kuti utyaire mutoro unorema, muripo we torque unowanzo kudiwa (kureva, kuvandudza chiyero cheU / f, chinonziwo torque boost).Iyo saturation degree yemotor magnetic circuit inoshanduka nemutoro.Iri rwendo rwepamusoro-rwazvino rwunokonzerwa nekuzara kwemota magineti wedunhu rinonyanya kuitika pakaderera frequency uye kuremerwa mutoro.Mhinduro: Gadzirisa chiyero cheU / f kakawanda.3, overload overcurrent: (1) Kukanganisa chiitiko Mimwe michina yekugadzira inongoerekana yawedzera mutoro panguva yekushanda, kana kunyange "kunamira".Kumhanya kwemota kunodonha zvakanyanya nekuda kwekusafamba kwebhandi, ikozvino inowedzera zvakanyanya, uye kudzivirira kwepamusoro kwakanonoka kuita, zvichikonzera kutsika kwepamusoro.(2) Mhinduro (a) Kutanga, tsvaga kana muchina wacho pachawo wakanganisa, uye kana wakanganisa, gadzirisa muchina wacho.(b) Kana uku kuwanda kuri chinhu chinowanzoitika mukugadzira, tanga wafunga kana reshiyo yekufambisa pakati pemota nemutoro inogona kuwedzerwa?Kuwedzera zvakaringana muyero wekutapurirana kunogona kudzikisira torque yekupokana pane mota shaft uye kudzivirira mamiriro ebhandi kusafamba.Kana chiyero chekufambisa chisingagoni kuwedzerwa, simba remotokari uye frequency converter inofanira kuwedzerwa.4. Kupfuura-ikozvino panguva yekukurumidza kana kuderedza: Izvi zvinokonzerwa nekukurumidza kukurumidza kana kuderedza, uye matanho anogona kutorwa ndeaya anotevera: (1) Wedzera nguva yekuwedzera (kuderedza) nguva.Chekutanga, nzwisisa kana zvichitenderwa kuwedzera iyo yekumhanyisa kana kudzikisa nguva zvinoenderana nezvinodiwa zvekugadzira.Kana yakabvumirwa, inogona kuwedzerwa.(2) Nyatsofanotaura kukurumidza (deceleration) kuzvirapa (kudzivisa kutsika) basa Inverter ine self-treatment (stall prevention) basa rekuwedzera panguva yekukurumidza uye kuderedza.Kana iyo inosimuka (inodonha) ikozvino inodarika preset yekumusoro muganhu ikozvino, iyo inosimuka (inodonha) yekumhanyisa ichamiswa, uye ipapo kusimuka (kudonha) kumhanya kunoenderera kana ikozvino madonhwe pasi peiyo yakatarwa kukosha.
Kuwedzeredza rwendo rwe frequency converter Iyo mota inogona kutenderera, asi inomhanya ikozvino inodarika iyo yakayerwa kukosha, iyo inonzi yakawandisa.Maitiro ekutanga ekuremerwa ndeyekuti kunyangwe ikozvino ichipfuura kukosha kwakayerwa, ukuru hwekuwedzeredza hauna hukuru, uye kazhinji hauite yakakura kukanganisa ikozvino.1, chikonzero chikuru chekuremedza (1) Iyo mechanic mutoro inorema zvakanyanya.Chinhu chikuru chekuremerwa ndechekuti mota inogadzira kupisa, iyo inogona kuwanikwa nekuverenga iyo inomhanya ikozvino pane yekuratidzira skrini.(2) Iyo isina kuenzana yechitatu-phase voltage inoita kuti kumhanya kwechimwe chikamu kuve kwakakurisa, zvichitungamira mukuremerwa, iyo inotaridzwa nekudziya kusingaenzaniswi kwemota, iyo inogona kusawanikwa kana uchiverenga kumhanya ikozvino kubva kuchiratidziro. skrini (nekuti skrini yekuratidzira inongoratidza chikamu chimwe chete chazvino).(3) Misoperation, yazvino yekuona chikamu mukati meiyo inverter inotadza, uye iyo yaonekwa chiratidzo chemazuva ano yakakura kwazvo, zvichikonzera kugumburwa.2. Nzira yekuongorora (1) Tarisa kana motokari ichipisa.Kana tembiricha yekukwira kwemota isina kukwira, chekutanga, tarisa kana iyo yemagetsi thermal kuchengetedza basa reiyo frequency converter rakagadzirirwa zvakanaka.Kana iyo frequency converter ichine yakawedzera, iyo preset kukosha kweiyo yemagetsi thermal kuchengetedza basa inofanirwa kudzoreredzwa.Kana tembiricha yekukwira kwemota yakawandisa uye kuwandisa kuri kwakajairika, zvinoreva kuti mota yaremerwa.Panguva ino, isu tinofanirwa kutanga tawedzera chiyero chekutapurirana nenzira kwayo kudzikisa mutoro pamota shaft.Kana inogona kuwedzerwa, wedzera chiyero chekutumira.Kana chiyero chekufambisa chisingagoni kuwedzerwa, simba remotokari rinofanira kuwedzerwa.(2) Tarisa uone kana matatu-phase voltage ari padivi pemota ari pakati nepakati.Kana iyo matatu-phase voltage padivi remota isina kuenzana, tarisa kana matatu-phase voltage painobuda kupera kweiyo frequency converter yakaenzana.Kana iyo zvakare isina kuenzana, dambudziko riri mukati meiyo frequency converter.Kana iyo voltage pamagumo ekubuda kweiyo frequency converter yakaenzana, dambudziko riri mumutsara kubva kune frequency converter kuenda kumota.Tarisa uone kana screws dzematerminals ese akasungwa.Kana paine macontactor kana zvimwe midziyo yemagetsi pakati peiyo frequency converter nemotor, tarisa kuti materminal emidziyo yemagetsi anoenderana akaomeswa uye kana mamiriro ekubata evanobatika akanaka.Kana iyo matatu-phase voltage padivi remota yakaenzana, iwe unofanirwa kuziva iyo frequency yekushanda paunenge uchitsika: Kana iyo frequency yekushanda yakaderera uye vector control (kana pasina vector control) inoshandiswa, chiyero cheU / f chinofanira kuderedzwa kutanga.Kana mutoro uchiri kutyaira mushure mekuderedzwa, zvinoreva kuti chiyero chepakutanga cheU / f chakanyanya kukwirira uye kukosha kwepamusoro kweiyo excitation ikozvino yakakura, saka ikozvino inogona kuderedzwa nekuderedza U / f chiyero.Kana pasina mutoro wakagadziriswa mushure mekuderedzwa, tinofanira kufunga nezvekuwedzera simba re inverter;Kana iyo inverter ine vector control function, vector control mode inofanira kutorwa.
Disclaimer: Ichi chinyorwa chakadhindwa kubva kunetiweki, uye zviri muchinyorwa ndezvekudzidza nekutaurirana chete.Iyo air compressor network haina kwayakarerekera kune maonero ari muchinyorwa.Kopirateti yechinyorwa ndeyemunyori wekutanga uye puratifomu.Kana pane kukanganisa, tapota taura kuti uibvise.