Variable Frequency Drives (VFDs): Taolo e Feletseng ea Motor le Tšireletso
Variable Frequency Drives (VFDs): Taolo e Felletseng ea Likoloi le Tšireletso
Selelekela
Variable Frequency Drives (VFDs) ke lisebelisoa tse matla tse etselitsoeng ho ntlafatsa ts'ebetso le katleho ea li-motor tse neng li reretsoe ho sebetsa ka lebelo le le leng. Ka ntle ho ts'ebetso ea bona ea mantlha, li-VFD li bapala karolo ea bohlokoa ho sireletseng lienjene khahlanong le liphoso tse ngata tse ka bang teng, ho kenyeletsoa overcurrent, overvoltage, undervoltage, undercurrent, stalling, phase reversal, ground faults, le phase-to-phase shorts. Litsamaisong tsa matla a mekhahlelo e meraro, ho kopanngoa ha li-VFD ho ka lebisa katlehong e kholo ea katleho, ho li beha e le tharollo e theko e boima haholo ho liindasteri tse fapaneng.
Melemo ea VFDs
Li-VFD li fana ka melemo e mengata, 'me ho boloka matla e le ntho e hlahelletseng, ho latela ts'ebeliso e khethehileng. Hangata li sebelisoa ho li-fan tsa centrifugal, lipompo, li-compressor, le lisebelisoa life kapa life tse ling tsa lebelo le tsitsitseng. Ka ho ntlafatsa katleho ea makoloi a AC, li-VFD li kenya letsoho bophelong bo bolelele ba ts'ebetso le litlhoko tse fokotsehileng tsa tlhokomelo. Ho feta moo, taolo e nepahetseng ea lebelo e fokotsa liphoso tsa ts'ebetso le litšila. Ho latela bokhoni ba bona ba tlhaho ba ho boloka matla, poelo ea matsete ho li-VFD e ka fumaneha ka nako e khuts'oane, ho tloha likhoeling tse 'maloa ho isa ho lilemo tse' maloa.
Litlhahiso tse Eketsehileng bakeng sa ho Eketsoa ha VFD
Ho kenya VFD ha ho akarelletse feela ho e hokahanya le enjene. Ho ipapisitsoe le litlhokahalo tse ikhethileng, likarolo tse ling tse kang li-filters tsa tšitiso ea motlakase, lihloela tsa maqhubu a seea-le-moea, likhoele tse kholoanyane, likhoele tse ncha, kapa li-reactor tsa mela/load li ka hlokahala. Ho ikhethela VFD ka likarolo tse kang mabone a sefofane, lipallo, lisebelisoa tsa ho fokotsa matla, li-transient voltage surge suppressors (TVSS), kapa li-filters tsa dv/dt le tsona lia khothaletsoa ho netefatsa ts'ebetso e nepahetseng. Ho hlokomoloha litlatsetso tsena ho ka lebisa ho se sebetseng hantle kapa ho senyeha ha makoloi.
Lintlha Tseo U Lokelang ho li Nahana Ha U Khetha VFD
Ha u khetha VFD bakeng sa lits'ebetso tsa motlakase tsa mekhahlelo e meraro, lintlha tse 'maloa li tlameha ho eloa hloko:
- Full Load Amps (FLA): Bohlokoa bakeng sa ho khetha VFD ea boholo bo nepahetseng.
- Voltage: Likhetho li kenyelletsa 208 VAC, 230/240 VAC, kapa 460/480 VAC.
- Phapang ea Voltage / Frequency
- Khanna Mabanta
- RPMs
- Mofuta oa Mojaro
- Lebelo la Lebelo
- Torque e hlokahalang
- Bokhoni ba hona joale bo fetelletseng
- Mokhoa oa ho Laola
- Tekanyo ea Inverter
Ts'ebetso ea VFD
Lisebelisoa tsa elektroniki tse ka har'a VFD li fetolela karolo e le 'ngoe ho DC li sebelisa diode, ebe li sebelisa li-capacitor ho hlahisa tlhahiso e lakatsehang ea AC. Matla ana a pulsed a etsisa AC hajoale. Li-VFD li tšehetsa lits'ebetso tse 'ne tsa mantlha tsa drive:
- Ho tsamaisa pele (lebelo le torque e ntle)
- Reverse motoring (lebelo le mpe le torque)
- Braking ea pele (lebelo le letle le torque e mpe)
- Reverse braking (lebelo le mpe le torque e ntle)
Auto Start & Emisa
Li-VFD tse ngata li etselitsoe ho iqalla, ho qala ka maqhubu a tlase le motlakase ho thibela maqhubu a inrush le mathata a mochini a amanang le ho qala ka kotloloho inthaneteng. Setupo sa wiring se ts'oana le li-unit tsa mohato o le mong empa li na le li-inverted lead. Ho beha L1, L2, le L3 ka har'a kontraka ho qala koloi le ho fetolela tlhahiso ho lebelo le lakatsehang, ho nolofalletsa koloi ho hlahisa torque ea bohlokoa. Ha o emisa, maqhubu le motlakase li fokotseha butle-butle ho fihlela motlakase o tima.