I-SELV imele uKhuseleko olongezelelekileyo lweVoltage. Ezinye iincwadana zokufakelwa kwamandla kwe-AC-DC zinezilumkiso malunga ne-SELV. Umzekelo, kunokubakho isilumkiso malunga nokudibanisa iziphumo ezimbini kuthotho kuba amandla ombane aphezulu anokugqitha kwinqanaba elichaziweyo le-SELV, elingaphantsi okanye elilinganayo ne-60VDC. Ukongeza, kunokubakho izilumkiso malunga nokukhusela iiterminal zokukhupha kunye nezinye iikhondaktha ezifikelelekayo kunikezelo lwamandla nezimbozo ukuthintela ukuba zingachukunyiswa ngabasebenzi okanye ngempazamo ngesixhobo esilahliweyo, njl.
I-UL 60950-1 ithi isekethe ye-SELV "isekethe yesibini eyilelwe kwaye yakhuselwa ukuba phantsi kweemeko eziqhelekileyo nezimpazamo enye, iivolthi zayo azidluli kwixabiso elikhuselekileyo." "Isekethe yesibini" ayinalo uqhagamshelo ngqo kumandla aphambili (ii-AC mains) kwaye ifumana amandla ayo ngesiguquli, isiguquli okanye isixhobo esilinganayo sodwa.
Uninzi lwee-switchmode eziphantsi kwamandla ombane we-AC-DC kunye neziphumo ukuya kuthi ga kwi-48VDC ihlangabezana neemfuno ze-SELV. Ngokuphuma kwe-48V useto lwe-OVP lunokufikelela kwi-120% yamagama, anokuvumela imveliso ukuba ifike kuma-57.6V ngaphambi kokuba umbane ucime; oku kungangqinelana nobuninzi be-60VDC yamandla eSELV.
Ukongeza, imveliso ye-SELV ifezekiswa ngokwahlulwa kombane ngokudibanisa okuphindwe kabini okanye okuqinisiweyo phakathi kwecala eliphambili nelasesekondari labaguquli. Ngapha koko, ukuhlangabezana nokubalulwa kwe-SELV, i-voltage phakathi kwawo nawaphi na amacandelo afikelelekayo / abaqhubi okanye phakathi kwenxalenye enye efikelelekayo / umqhubi kunye nomhlaba akufuneki idlule kwixabiso elikhuselekileyo, elichazwa njenge-42.4 VAC incopho okanye i-60VDC engekho ngaphezulu kwama-200 ms ngexesha eliqhelekileyo ukusebenza. Ngaphantsi kwemeko enye yempazamo, le mida ivunyelwe ukuya phezulu kwi-71VAC incopho okanye kwi-120VDC ngaphezulu kwama-20 ms.
Musa ukumangaliswa xa ufumana ezinye izinto zombane ezichaza i-SELV ngokwahlukileyo. Ezi nkcazo / iinkcazo zilapha ngasentla zibhekisa kwi-SELV njengoko ichaziwe yi-UL 60950-1 kunye nezinye izinto ezinxulumene noko ngokubhekisele kumandla ombane asezantsi.
Ixesha lokuposa: Jul-20-2021