Variable Frequency Drives (VFDs): Kev tswj hwm lub cev muaj zog thiab kev tiv thaiv
Variable Frequency Drives (VFDs): Comprehensive Motor Control thiab Protection
Taw qhia
Variable Frequency Drives (VFDs) yog cov cuab yeej muaj zog tsim los txhim kho kev ua haujlwm thiab kev ua haujlwm ntawm lub cev muaj zog thaum xub thawj rau kev ua haujlwm ib leeg. Tshaj li lawv lub luag haujlwm tseem ceeb, VFDs ua lub luag haujlwm tseem ceeb hauv kev tiv thaiv lub cev muaj zog tiv thaiv ntau yam kev ua txhaum cai, suav nrog overcurrent, overvoltage, undervoltage, undercurrent, stalling, theem rov qab, av txhaum, thiab theem-rau-theem luv. Hauv peb-theem hluav taws xob tshuab, kev sib koom ua ke ntawm VFDs tuaj yeem ua rau muaj txiaj ntsig zoo, muab tso rau lawv raws li cov kev daws teeb meem zoo tshaj plaws thoob plaws ntau yam kev lag luam.
Qhov zoo ntawm VFDs
VFDs muaj ntau cov txiaj ntsig, nrog rau kev txuag hluav taws xob yog qhov tseem ceeb, nyob ntawm daim ntawv thov tshwj xeeb. Lawv feem ntau siv hauv cov kiv cua centrifugal, twj, compressors, thiab lwm yam kev siv lub cev muaj zog. Los ntawm kev txhim kho AC lub cev muaj zog ua haujlwm, VFDs ua rau lub neej ua haujlwm ntev dua thiab txo cov kev tu ncua. Tsis tas li ntawd, kev tswj ceev ceev txo qis kev ua haujlwm tsis raug thiab pov tseg. Muab lawv lub peev xwm txuag hluav taws xob, qhov rov qab los ntawm kev nqis peev hauv VFDs tuaj yeem pom tau hauv lub sijhawm luv luv, txij li ob peb lub hlis mus rau ob peb xyoos.
Kev txiav txim siab ntxiv rau VFD Installation
Txhim kho VFD cuam tshuam ntau dua li tsuas yog txuas rau lub cev muaj zog. Raws li cov kev xav tau tshwj xeeb, cov khoom siv ntxiv xws li cov ntxaij lim dej cuam tshuam electromagnetic, xov tooj cua zaus lim, cov ntaub ntawv loj dua, cov kab tshiab, lossis kab / load reactors yuav tsim nyog. Customizing VFD nrog cov yam ntxwv zoo li lub teeb tsav, hla dhau, kev sib haum xeeb txo cov khoom siv, cov khoom siv hluav taws xob hloov pauv hloov hluav taws xob (TVSS), lossis dv / dt cov ntxaij lim dej kuj pom zoo kom ua kom pom kev ua haujlwm zoo. Tsis quav ntsej cov kev ntxiv no tuaj yeem ua rau kev ua haujlwm tsis zoo lossis txawm tias lub cev muaj zog puas tsuaj.
Tej yam yuav tsum tau xav txog thaum xaiv VFD
Thaum xaiv VFD rau peb-theem fais fab kev thov, ntau yam yuav tsum tau muab rau hauv kev txiav txim siab:
- Puv Load Amps (FLA): Qhov tseem ceeb rau kev xaiv VFD qhov loj me.
- Voltage: Cov kev xaiv muaj xws li 208 VAC, 230/240 VAC, lossis 460/480 VAC.
- Voltage/Frequency Variation
- Tsav Belts
- RPMs
- Load Hom
- Ceev Range
- Yuav tsum tau Torque
- Overload Tam sim no muaj peev xwm
- Tswj Txoj Kev
- Inverter Rating
VFD kev ua haujlwm
Cov khoom siv hluav taws xob hauv VFD hloov ib theem tam sim no rau DC siv diodes, thiab tom qab ntawd siv cov khoom siv hluav taws xob los tsim cov khoom siv AC xav tau. Lub zog hluav taws xob no ua raws li AC tam sim no. VFDs txhawb nqa plaub qhov kev ua haujlwm tsav yooj yim:
- Forward motoring (zoo ceev thiab torque)
- Rov qab motoring (tsis zoo ceev thiab torque)
- Forward braking (zoo ceev thiab tsis zoo torque)
- Rov qab braking (negative ceev thiab zoo torque)
Pib pib & nres
Feem ntau VFDs yog tsim los pib pib, pib nrog tsawg zaus thiab voltage los tiv thaiv inrush tam sim no thiab txhua yam teeb meem cuam tshuam nrog ncaj qha-on-line pib. Kev teeb tsa hluav taws xob zoo ib yam li ib-theem chav nyob tab sis nrog cov coj rov qab. Muab tso rau hauv L1, L2, thiab L3 rau hauv tus neeg cog lus pib tsav tsheb thiab hloov cov zis mus rau qhov xav tau ceev, ua kom lub cev muaj zog los tsim lub zog loj. Thaum nres, qhov zaus thiab qhov hluav taws xob txo qis kom txog thaum lub cav kaw.