Kuziva aya makumi matatu neshanu inverter concepts kunogona kusimudza hunyanzvi hwako kusvika pamazinga anoyemurika!
Kuziva aya makumi matatu neshanu inverter concepts kunogona kusimudza hunyanzvi hwako kusvika pamazinga anoyemurika!
Izwi rekuti VFD (Variable-frequency Drive) ye inverter inoratidza basa rayo rekudzora ma AC motors nekugadzirisa frequency uye amplitude yemagetsi. MuAsia, kunyanya muChina neSouth Korea, izwi rekuti VVVF (Variable Voltage Variable Frequency Inverter) rakashandiswa nekuda kwesimba reJapan. VVVF inomirira Variable Voltage uye Variable Frequency, zvichireva kugadziridzwa kwezvose zviri zviviri voltage uye frequency, ukuwo CVCF (Constant Voltage uye Constant Frequency) inoratidza yakagadziriswa voltage uye frequency.
Magetsi masosi akakamurwa kuita AC uye DC. Mazhinji masimba eDC anotorwa kubva kuAC kuburikidza neshanduko, kugadzirisa, uye kusefa. Simba reAC rinoumba angangoita makumi mapfumbamwe neshanu muzana eese mashandisirwo emagetsi, aine chikamu chimwe chete uye chetatu-chikamu AC simba rinotevera chaiyo voltage uye frequency mwero munyika dzakasiyana. Semuenzaniso, munyika yeChina, imwe-phase AC i220V uye matatu-phase AC i380V, ese ari pa50Hz. Inverter inoshandura yakagadziriswa voltage uye frequency AC simba kuita inoshanduka voltage kana frequency AC simba. Kuita uku kunosanganisira kugadzirisa AC kuenda kuDC uye wozodzosera DC kudzokera kuAC, nekuita kwekupedzisira kunonzi "inversion." Midziyo inoshandura DC kuita yakatemwa frequency uye voltage AC inodaidzwa kuti inverters, nepo iyo inobvumira inogadziriswa frequency uye voltage inodaidzwa sekusiyana-frequency madhiraivha.
Inverters inoburitsa inoteedzera sine mafungu, anonyanya kushandiswa kumhanya kudzora kweatatu-chikamu asynchronous mota, uye anozivikanwawo seanochinja-frequency kumhanya anodzora. Kune maapplication anoda emhando yepamusoro-waveforms, senge midziyo yekuyedza mune chiridzwa, waveform inonatswa kuti igadzire yakajairwa sine wave, uye michina yakadai inonzi inochinja-frequency magetsi ekushandisa. Variable-frequency magetsi emagetsi anowanzo kudhura zvakapetwa ka15 kusvika makumi maviri pane kudhiraivha-frequency drives. Chinhu chakakosha chinokonzeresa kugadzira inoshanduka voltage kana frequency mune inverter midziyo ndeye "inverter," saka chigadzirwa chinodaidzwa kuti "inverter." Mainverters anoshandiswawo mumidziyo yemumba, senge air conditioners uye mwenje wefluorescent. Mumagetsi ekudzora mashandisirwo, ma inverters anogona kugadzirisa ese ari maviri voltage uye frequency, nepo ayo anoshandiswa mwenje wefluorescent anonyanya kudzora magetsi ekupa frequency. Midziyo mumotokari inoshandura bhatiri (DC) simba kuAC inotengeswa zvakare pasi pezita rekuti "inverter." Nheyo yekushanda yemainverters inoshandiswa zvakanyanya munzvimbo dzakasiyana siyana, senge magetsi emakomputa, uko ma inverters anodzvanya reverse voltage, frequency fluctuation, uye kudzimwa kwemagetsi ipapo.
Chii chinonzi inverter?
An inverter chishandiso chinoshandura utility frequency simba kune imwe frequency uchishandisa switching chiito chemagetsi semiconductor zvishandiso. Iyo ine maviri makuru maseketi: dunhu guru (rectifier module, electrolytic capacitor, uye inverter module) uye dunhu rekutonga (kuchinja kwemagetsi ekupa bhodhi uye control circuit board). Iyo CPU yakaiswa pane control circuit board, ine inverter's operation software yakarongwa muCPU. Iyo software yeiyo yakafanana inverter modhi inowanzogadziriswa, kunze kweiyo Sanjing inverter, iyo software inogona kugadziriswa zvichienderana nezvinodiwa zvekushandisa.
Ndeupi musiyano uripo pakati pePWM nePAM?
PWM (Pulse Width Modulation) inogadzirisa hupamhi hwemapulisi muchitima chinoputika maererano nemaitiro chaiwo ekugadzirisa kubuda uye waveform. PAM (Pulse Amplitude Modulation) inogadzirisa iyo amplitude yemapulses muchitima chekupuruzira kudzora kubuda uye waveform.
Ndeupi misiyano pakati pevoltage-mhando uye yazvino-mhando inverters?
Iyo huru yedunhu reinverter inogona kukamurwa zvakakamurwa kuita mhando mbiri: voltage-mhando inverters inoshandura DC voltage sosi kuenda kuAC ichishandisa capacitor yeDC sefa yekusefa, nepo ikozvino-mhando inverters inoshandura DC ikozvino sosi kuAC vachishandisa inductors yeDC sefa yekusefa.
Sei voltage uye frequency ye inverter ichichinja zvakaenzana?
Iyo torque ye induction mota inogadzirwa nekudyidzana pakati pemagineti flux uye rotor ikozvino. Pane yakayerwa frequency, kana voltage ichigara uye frequency yakaderedzwa, magineti flux inogona kuwandisa, zvichitungamira kune magineti wedunhu saturation uye inogona kukanganisa mota. Naizvozvo, voltage uye frequency zvinofanirwa kuchinja zvakaenzana. Iyi nzira yekudzora inowanzoshandiswa mumagetsi-anochengetedza inverters kune mafeni nemapombi.
Kana induction mota ichifambiswa neutility frequency simba uye voltage inodonha, ikozvino inowedzera. Kune inverter-inotyairwa mota, kana voltage ikadzikira kana frequency yadzikira, ikozvino inowedzera here?
Kana frequency yadzikira (yakaderera kumhanya), ikozvino inowedzera kuchengetedza imwechete simba kubuda. Nekudaro, pasi penguva dzese torque mamiriro, ikozvino inoramba yakagadzikana.
Ndeipi yekutanga ikozvino uye torque kana uchishandisa mota ine inverter?
Iine inverter, sezvo mota ichimhanyisa, frequency uye voltage zvinowedzerwa, zvichimisa kutanga ikozvino kusvika pazasi 150% yeyakayerwa ikozvino (125% kusvika 200% zvichienderana nemuenzaniso). Yakananga pamhepo kutanga neutility frequency simba inokonzeresa kutanga mafambiro katanhatu kusvika kanomwe pane yakayerwa ikozvino, zvichikonzera kushushikana kwemagetsi nemagetsi. Inverter-inotyairwa mota dzinotanga mushe (nenguva yakawedzerwa yekutanga), nekutanga ikozvino pa1.2 kusvika 1.5 nguva yakayerwa ikozvino uye kutanga torque pa70% kusvika 120% yeyakayerwa torque. Kune ma inverters ane otomatiki torque inowedzera, kutanga torque inodarika 100%, ichigonesa kuzara-mutoro kutanga.
Chii chinonzi V/f modhi?
Kana frequency yadzikira, voltage V inodzikirawo zvakaenzana. Hukama hwakaenzana pakati peV na f hunotemerwa zvichibva pahunhu hwemotokari uye hunowanzo chengetwa mundangariro dzemutongi (ROM). Maitiro akati wandei anogona kusarudzwa kuburikidza nekuchinja kana potentiometers.
Ko mota torque inoshanduka sei kana V uye f zvagadziriswa zvakaenzana?
Kana voltage ikaderedzwa zvakaenzana ne frequency, tsika yekuti torque iderere nekumhanya kwakaderera inomuka nekuda kwekuderedzwa kwe AC impedance uye kusachinjika DC kuramba. Kubhadhara uye kuwana yakakwana yekutanga torque pane yakaderera frequency, inobuda voltage inofanirwa kuwedzerwa zvishoma. Muripo uyu, unozivikanwa se torque boost, unogona kuwanikwa kuburikidza nenzira dzakasiyana siyana, kusanganisira otomatiki kugadzirisa, kusarudzwa kweV/f modhi, kana potentiometer marongero.
Kana bhuku racho richitsanangura kumhanya kwe60~6Hz (10:1), zvinoreva here kuti hapana simba rinobuda pazasi pe6Hz?
Simba rinogona kuramba richibuda pazasi 6Hz. Nekudaro, uchifunga tembiricha yekukwira kwemota uye kutanga torque, iyo shoma yekushanda frequency inoiswa kutenderedza 6Hz kudzivirira kupisa kwakanyanya uku uchichengetedza yakayerwa kuburitsa torque. Iyo chaiyo yekubuda frequency (yekutanga frequency) yeinverter inosiyana nemuenzaniso, kazhinji kubva ku0.5Hz kusvika 3Hz.
Zvinogoneka here kuchengetedza inogara torque neyakajairwa mota musanganiswa pamusoro pe60Hz?
Kazhinji, hazvibviri. Pamusoro pe60Hz (kana 50Hz mune mamwe modhi), voltage inoramba iripo, zvichiita kuti irambe iine masimba emagetsi. Kana torque yenguva dzose ichidikanwa pakumhanya kwakanyanya, kunyatsosarudzwa kwemota uye inverter masimba kwakakosha.
Chii chinonzi open-loop control?
Kana inomhanyisa detector (PG) yakaiswa pamota uye kumhanya chaiko kunodzoserwa kumudziyo wekudzora wekudzora, inonzi "yakavharwa-loop" kutonga. Kushanda pasina PG mhinduro kunonzi "kuvhurika-loop" kutonga. General-chinangwa inverters anowanzo shandisa yakavhurika-loop control, asi mamwe mamodheru achipa PG mhinduro senge sarudzo. Speed sensorless yakavharwa-loop control inofungidzira chaiyo mota kumhanya zvichibva pane yemasvomhu modhi yekuyerera, zvinobudirira kugadzira yakavharwa-loop control system ine virtual speed sensor.
Chii chinoitika kana paine mutsauko pakati pemamhanyiro chaiwo nemaseti?
Mukuvhurika-loop control, kunyangwe iyo inverter ikaburitsa frequency yakatarwa, kumhanya kwemota kunogona kusiyanisa mukati meiyo yakatemerwa slip renji (1% kusvika 5%) pasi pemutoro. Kune maapplication anoda kumhanyisa kurongeka kwemitemo uye pedyo-seti-kumhanya mashandiro kunyangwe shanduko yemutoro, inverters ine PG mhinduro (inowanikwa senge sarudzo) inogona kushandiswa.
Kumhanya chaiko kunogona kuvandudzwa uchishandisa mota ine PG mhinduro?
Inverters ine PG mhinduro inopa yakagadziridzwa yekumhanyisa kurongeka. Nekudaro, iko chaiko kumhanya kunoenderana nekurongeka kwePG uye inverter yekubuda frequency resolution.
Chii chinonzi anti-stall function?
Kana iyo yakatarwa yekumhanyisa nguva ipfupi, iyo inverter yekubuda frequency inogona kukurumidza kukurumidza kupfuura kumhanya kwemota (yemagetsi angular frequency), zvichikonzera overcurrent uye kukanganisa inverter, iyo inomisa kushanda. Izvi zvinonzi stalling. Kudzivirira kumira uye kuchengetedza kushanda kwemota, iyo inverter inotarisisa ikozvino uye inogadzirisa frequency. Munguva yekuwedzera, kana ikozvino ikava yakawandisa, chiyero chekusimudzira chinoderedzwa. Izvo zvinoshandawo kune deceleration. Pamwe chete, maitiro aya anoumba anti-stall basa.
Chii chakakoshera ma inverters anobvumira akaparadzana marongero ekumhanyisa uye kudzikamisa nguva kupikisaavo vanoshandisa mamiriro akafanana?
Mainverters anobvumira kukwidziridza kwakasiyana uye kudzika nguva zvigadziriso akakodzera zvikumbiro zvinoda kukwidziridzwa zvishoma uye zvishoma nezvishoma kudzikisira, kana kune maturusi emuchina madiki ane yakasimba yekugadzira rhythm zvinodiwa. Mukupesana, kune maapplication akaita semafan dhiraivha uko kukwidziridza uye kudzikisira nguva dzese dzakareba, yakajairwa kuseta yekumhanyisa uye kudzika nguva kwakakodzera.
Chii chinonzi regenerative braking?
Kana iyo frequency yekuraira yakaderedzwa panguva yekushanda kwemota, mota inochinjika kune asynchronous jenareta modhi uye inoshanda sebhureki. Iyi nzira inozivikanwa se regenerative (magetsi) braking.
Simba guru rekubhureki rinogona kuwanikwa here?
Simba rakagadzirwazve kubva kumota rinochengetwa mune inverter's filter capacitor. Nekuda kwesimba re capacitor uye kuganhurwa kwemagetsi rating, regenerative braking force in general-chinangwa inverters ingangoita 10% kusvika 20% yeiyo yakayerwa torque. Nemayuniti ekusarudza mabhureki, izvi zvinogona kuwedzerwa kusvika pa50% kusvika pa100%.
Ndeapi mabasa ekudzivirira einverter?
Dziviriro mabasa anogona kuiswa muzvikamu zvinotevera:
(1) Kugadzirisa otomatiki mamiriro asina kujairika, senge overcurrent kudzivirira matanda uye regenerative overvoltage stall kudzivirira.
(2) Kuvharira masaini ekutonga kwePWM kune simba semiconductors pakuona zvisirizvo, zvichiita kuti mota imire otomatiki. Mienzaniso inosanganisira overcurrent shutdown, regenerative overvoltage shutdown, semiconductor cooling fan overheat dziviriro, uye pakarepo kudzivirira kukundikana kwesimba.
Sei iyo inverter yekudzivirira basa ichiita kana uchishandisa clutch yekuenderera mberi mutoro?
Kana clutch ichibatanidza mutoro, mota inokurumidza kushandura kubva pasina-mutoro kuenda kunharaunda yekumusoro kutsvedza. Iyo inokonzeresa yakakwira ikozvino inoita kuti inverter ifambe nekuda kwekupfuura, kumisa kushanda.
Sei iyo inverter ichimira panguva yekushanda kana mahombe emota achitanga munzvimbo imwechete?
Munguva yekutanga mota, iyo inrush ikozvino inoenderana nekugona kwemota, zvichikonzera kudonha kwevoltage padivi re transformer. Kune mahombe mota, iyi voltage inodonha inogona kukanganisa zvakanyanya mimwe michina yakabatana kune imwechete transformer. Iyo inverter inogona kududzira izvi se undervoltage kana pakarepo kurasikirwa kwesimba, zvichikonzera basa rayo rekudzivirira (IPE) uye kuita kuti rimire.
Chii chinonzi inverter resolution uye nei yakakosha?
Kune madhijitari anodzorwa inverters, kunyangwe iyo frequency command iri analog chiratidzo, iyo inobuda frequency inopihwa mumatanho akasarudzika. Iyo diki yuniti yematanho aya inonzi inverter resolution. Kazhinji, inverter resolution inotangira pa0.015Hz kusvika 0.5Hz. Semuenzaniso, ne 0.5Hz resolution, mafrequency ari pamusoro pe23Hz anogona kugadziridzwa kuita 23.5Hz kana 24.0Hz, zvichikonzera kushanda kwemota kwakawedzera. Izvi zvinogona kunetsa kune zvikumbiro senge kuenderera mberi mamhepo kutonga. Mumamiriro ezvinhu akadaro, kugadziriswa kweinenge 0.015Hz kunovimbisa kuti kune ina-pole mota, nhanho imwe neimwe inoenderana isingasviki 1r/min, ichipa kukwana kuchinjika. Mamwe ma inverter modhi anosiyanisa pakati pekuraira kugadzirisa uye kuburitsa sarudzo.
Pane zvirambidzo pane yekumisikidza nzira ye inverter?
Inverter dhizaini inofunga kutonhora kushanda kwemukati mezvikamu uye kumashure. Mamiriro echikamu akakosha pamhepo. Kune mapaneru-akaiswa kana madziro-akaiswa unit-type inverters, vertical kuisirwa munzvimbo yelongitudinal inokurudzirwa.
Zvinogoneka here kubatanidza mota zvakananga kune yakagadziriswa-frequency inverter pasina kushandisa nyoro yekutanga?
Pamafafitera akaderera, izvi zvinogoneka. Nekudaro, kana iyo seti frequency yakakwira, mamiriro akafanana akananga online achitanga neutility frequency simba. Izvi zvinogona kukonzera kuwanda kwekutanga mafungu (katanhatu kusvika kanomwe yakayerwa ikozvino), uye sezvo inverter ichafamba kuti idzivirire kubva kune yakawandisa, mota inotadza kutanga.
Ndedzipi dziviriro dzinofanirwa kutorwa kana uchishandisa mota iri pamusoro pe60Hz?
Paunenge uchishanda pamusoro pe60Hz, funga zvinotevera:
(1) Ita shuwa kuti michina uye ine hukama michina inogona kumira kushanda pakumhanya kwakadaro (simba remagetsi, ruzha, vibration, nezvimwewo).
(2) Motokari inopinda musimba rinogara richibuda remagetsi, uye torque yayo yekubuda inofanirwa kusimudzira basa (kune mafeni nemapombi, shaft yekubuda simba inowedzera necube yekumhanya, saka kunyangwe kudiki kumhanya kunoda kutariswa).
(3) Kubereka upenyu kungakanganiswa uye kunofanira kunyatsofungwa.
(4) Kumamotor epakati nepakati, kunyanya maviri-pole mota, bvunza mugadziri usati washanda pamusoro pe60Hz.
Ko inverters inogona kutyaira magiya mota?
Zvichienderana nechimiro chemugadziri uye nzira yekuzora, mifungo yakati wandei inoshanda. Kazhinji, zvimiro zvegiya zvinogona kushivirira huwandu hwe70 ~ 80Hz. Nekuzora mafuta, kuenderera kwakaderera-kumhanya kushanda kunogona kukanganisa magiya.
Ko ma inverters anogona kutyaira single-phase motors? Vanogona here kushanda pasimba rechikamu chimwe chete?
Kazhinji, hazvigoneki. Kune single-phase motors ane anomhanyisa controller kana switch-yekutanga masisitimu, kudzikisa kukurumidza pazasi penzvimbo yekushandisa kunogona kuwedzeredza mhepo yekubatsira. Kune capacitor-kutanga kana capacitor-run marudzi, capacitor kuputika kunogona kuitika. Mainverters anowanzoda matatu-chikamu magetsi ekupa, kunyange mamwe madiki emhando dzemhando anogona kushanda pane imwe-chikamu simba.
Isimba rakawanda sei rinoshandisa inverter pachayo?
Kushandiswa kwesimba kunoenderana neiyo inverter modhi, mamiriro ekushanda, uye frequency yekushandisa. Zvakaoma kudoma chaiwo hunhu. Nekudaro, inverter inoshanda pazasi 60Hz ingangoita 94% kusvika 96%, inogona kushandiswa kufungidzira kurasikirwa. Kune ma inverters ane akavakirwa-mukati regenerative braking (semuenzaniso, FR-K akateedzana), kufunga nezvekurasikirwa kwebhureki kunowedzera mashandisiro emagetsi, chinhu chekucherechedza mukudzora mapaneru dhizaini.
Sei kutadza kuenderera mberi kushanda kwese kwese 6 ~ 60Hz renji?
Mazhinji mota anoshandisa mafeni ekunze pane shaft kana blades pane rotor yekupedzisira mhete yekutonhodza. Kudzikiswa kumhanya kunodzikisira kutonhora kushanda, kudzivirira mota kubva pakutsungirira yakafanana chizvarwa chekupisa sekumhanya kwakanyanya. Kuti ugadzirise izvi, deredza yakaderera-kumhanya torque, shandisa yakakura inverter uye mota musanganiswa, kana shandisa yakasarudzika mota.
Ndeapi matanho anofanirwa kutorwa paunenge uchishandisa mota ine brake?
Iyo brake excitation circuit inofanirwa kuve powered kubva kune inverter's input side. Kana bhureki rikaita apo inverter iri kuburitsa simba, overcurrent inogona kukonzera kudzima. Naizvozvo, ita shuwa kuti brake inobata chete mushure mekunge inverter yamira kuburitsa simba.
Sei mota isingatange kana uchishandisa inverter kutyaira mota ine simba factor yekuvandudza capacitors?
Inverter yazvino inoyerera ichipinda musimba rekuvandudza capacitors. Iyo yekuchaja ikozvino inogona kukonzeresa overcurrent (OCT) mune inverter, kudzivirira kutanga. Kuti ugadzirise izvi, bvisa ma capacitor uye shandisa mota. Kuwedzera simba chinhu, kuisa AC reactor padivi rekuisa inverter kunoshanda.
Ndeipi nguva yehupenyu ye inverter?
Kunyangwe ma inverters ari static zvishandiso, ane zvinhu zvinobatika sesefa capacitors uye kutonhora mafeni. Nekugadzirisa nguva dzose kwezvikamu izvi, inverter inogona kugara kwemakore gumi.
Iyo inotonhorera fan inotungamirwa sei mune inverter, uye chii chinoitika kana ikatadza?
Mamwe madiki ma inverters anoshaya kutonhora mafeni. Kune mamodheru ane mafeni, kuyerera kwemhepo kunowanzo kubva pasi kuenda kumusoro. Paunenge uchiisa inverter, dzivirira kuisa michina inovharira kupinza kwemhepo uye kupera simba pamusoro uye pazasi peyuniti. Usaisa zvikamu zvinopisa kupisa pamusoro pe inverter. Kutadza kweFan kunodzivirirwa kubva pakuona kumira kwefan kana kupisa kwe fan inotonhora.
Hurefu hwehupenyu hwemasefa capacitor hungagadziriswa sei?
Sefa capacitor, inoshandiswa se capacitor, zvishoma nezvishoma inorasikirwa nemagetsi emagetsi nekufamba kwenguva. Gara uchiyera huwandu hwemagetsi, uye funga kuti hupenyu hwecapacitor hwapera kana hwasvika 85% yehuwandu hwakayerwa.
Pane zvirambidzo pane yekumisikidza nzira ye inverter?
Inverters anowanzo kuchengetwa mukati memapanera. Nekudaro, mapaneru akavharirwa zvizere akakura, anotora nzvimbo, uye anodhura. Matanho ekuderedza anosanganisira:
(1) Kugadzira mapaneru ekutonhora kunodiwa kwemidziyo chaiyo.
(2) Kuwedzera kutonhora nzvimbo uchishandisa aruminiyamu kupisa sink, zvimbi, uye inotonhodza zvinhu.
(3) Kushandisa kupisa pombi.
Pamusoro pezvo, ma inverter modhi ane akafumurwa kumashure mativi akagadzirwa.
Inofanirwa kusarudzwa sei inverter kuti iwedzere kumhanya kwebhandi ku80Hz?
Kushandiswa kwesimba kwemabhandi ekutakurisa kunoenzanirana nekumhanya. Kuti ushande pa80Hz, zvese inverter uye mota simba rinofanira kuwedzerwa zvakaenzana kusvika 80Hz/50Hz, kureva, kuwedzera kwe60%.
Chengetedzo panguva yekugadzirisa uye kuongorora:
(1) Mushure mekudzima simba rekuisa, mirira angangoita maminetsi mashanu usati watanga kuongorora (ona kuti chiratidzo chekuchaja LED chadzima) kudzivirira kuvhunduka kwemagetsi.
(2) Kuchengetedza, kuongorora, uye kuchinjwa kwechikamu kunofanira kuitwa nevashandi vanokwanisa. Bvisa zvinhu zvese zvesimbi (wachi, zvishongo, nezvimwewo) usati watanga basa uye shandisa insulated zvishandiso.
(3) Usagadzirise inverter nekupokana kudzivirira kuvhunduka kwemagetsi uye kukuvara kwechigadzirwa.
(4) Usati washanda inverter, simbisa iyo yekuisa voltage. Kubatanidza magetsi e380V kune 220V-class inverter inogona kukonzera kukanganisa (capacitor, varistor, module explosion, nezvimwewo).
Mainverters, anoumbwa zvakanyanya semiconductor zvinhu, anoda kuongororwa zuva nezuva kuti azvidzivirire kubva kune yakaipa nharaunda yekushanda, senge tembiricha, hunyoro, guruva, uye vibration, uye kudzivirira kukanganisa kunokonzerwa nechikamu chenguva yeupenyu.
Zvinhu zvekuongorora:
(1) Kuongorora kwemazuva ese: Tarisa kuti inverter inoshanda sezvinodiwa. Shandisa voltmeter kuti utarise ekuisa uye kubuda voltages apo inverter iri kushanda.
(2) Periodic inspection: Ongorora nzvimbo dzese dzinowanikwa chete kana inverter ichivharwa.
(3) Component replacement: Component lifespan inokonzerwa zvakanyanya nekuisa mamiriro.