Thaum lub sij hawm braking txheej txheem, lub sab hauv poob ntawm lub cev muaj zog thiab cov neeg kho tshuab load poob yog kwv yees li 20% ntawm lub rated torque.
Yog li ntawd, yog hais tias qhov yuav tsum tau braking torque tsawg tshaj li qhov no tus nqi, tsis muaj lwm yam braking resistor yuav tsum tau. Thaum lub zaus converter (VFD) yog siv rau deceleration los yog thaum muaj xwm ceev deceleration ntawm ib tug loj inertia load, lub cev muaj zog ua hauj lwm nyob rau hauv lub zog tsim lub xeev thiab xa cov load zog mus rau lub DC Circuit Court ntawm VFD los ntawm inverter choj, ua rau lub VFD tsheb npav voltage. nce.
Thaum nws tshaj ib qho nqi, tus zaus converter yuav qhia txog qhov txhaum ntawm overvoltage (deceleration overvoltage, sudden deceleration overvoltage).
Txhawm rau tiv thaiv qhov tshwm sim no tshwm sim, yuav tsum xaiv lub braking resistor.
Kev xaiv ntawmBraking Resistortsis kam:
Tus nqi kuj ntawm lub braking resistor yuav tsum tsis txhob loj heev. Tus nqi tiv thaiv ntau dhau yuav ua rau tsis txaus braking torque. Nws feem ntau tsawg dua los yog sib npaug rau tus nqi braking resistor sib raug rau 100% braking torque. Qhov kev tiv thaiv ntawm lub braking resistor yuav tsum tsis txhob me heev, thiab yuav tsum tsis txhob tsawg tshaj li qhov tsawg kawg nkaus tus nqi ntawm lub braking resistor. Kev nres nres tam sim no ntau dhau tuaj yeem ua rau lub zog ua haujlwm ntawm lub inverter.
Kev xaiv ntawm braking resistor zog:
Tom qab xaiv tus nqi kuj ntawm lubBraking Resistor, xaiv lub zog ntawm lub braking resistor raws li kev siv braking tus nqi ntawm 15% thiab 30%. Noj 100kg tshem tawm tag nrho cov dej tsis siv neeg lub cev ua piv txwv, siv 11kW zaus hloov pauv, tus nqi siv nres yog li 15%: Koj tuaj yeem xaiv 62Ω braking resistor sib raug rau "100% braking torque", thiab xaiv lub zog ntawm lub braking. resistor. Xa mus rau "100% braking torque" thiab "15% braking utilization" cov lus, qhov sib thooj braking resistor zog yog 1.7kW, thiab cov uas nquag siv yog 1.5kW lossis 2.0kW. Thaum kawg, xaiv "62Ω, 1.5kW" lossis 2.0 kW braking resistance.
"Yuav kom nres nrawm dua, ob "62Ω, 1.5kW braking resistors" tuaj yeem txuas nrog rau qhov sib npaug, uas yog sib npaug rau "31Ω, 3.0kW braking resistor".
Txawm li cas los xij, nws yuav tsum raug sau tseg tias qhov kawg ntawm tus nqiBraking Resistor Kev sib txuas ntawm P + thiab DB terminals yuav tsum tsis txhob tsawg tshaj li qhov tsawg kawg nkaus tiv thaiv tus nqi ntawm 30Ω. Kev siv nres: Qhov no yog hais txog qhov piv ntawm lub sijhawm nyob rau hauv braking rau tag nrho lub sijhawm ua haujlwm. Lub braking siv tus nqi tso cai rau lub braking unit thiab braking resistor txaus lub sij hawm los dissipate lub tshav kub generated thaum lub sij hawm braking. Piv txwv li, yog tias lub tshuab ua haujlwm rau 50 feeb thiab nyob rau hauv lub xeev braking rau 7.5 feeb, tus nqi braking yog 7.5/50 = 15%.
Rau lub sijhawm uas yuav tsum tau ua kom muaj kev sib tsoo ntau zaus, xws li lub cev qhuav dej, yog tias tus nqi nres ntau tshaj 15% hauv lub rooj, lub zog ntawm lub braking resistor yuav tsum tau nce proportionally raws li cov kev ua haujlwm tshwj xeeb. Vam tias qhov kev txhais lus no yuav pab tau rau koj!
