Iindaba zeMveliso

Ngaphakathi kweendawo zoshishino ezinobungozi apho igesi etshayo, umphunga kunye nothuli oluvuthayo zibeka umngcipheko wokuqhushumba rhoqo, iintambo ezikhuselekileyo (IS) zimele ulawulo lokhuseleko oluyilwe ngobuchule olubalulekileyo lwezixhobo ezisebenzisa amandla aphantsi, unxibelelwano kunye neesekethe zolawulo. Ngokungafaniyo neentambo eziqhelekileyo zesiqhelo, iintambo ezikhuselekileyo zenzelwe injongo yokunciphisa ukukhutshwa kwamandla ombane phantsi kweemeko eziqhelekileyo zokusebenza kunye neziphene, ukususa imithombo enokubakho yokutsha.

Iintambo ezikhuselekileyo ngaphakathi mazibe luhlaza okwesibhakabhaka (RAL 5015) ngokwe-IEC 60079-14 ukuze kuchongwe indawo enobungozi.
Le khowudi yombala inyanzelekileyo ivumela iingcali zombane ukuba zikwazi ukwahlula ngoko nangoko iisekethe ze-IS kwiintambo zombane ezingezizo ze-IS, nto leyo ethintela uqhagamshelo lwamandla ayingozi ngengozi.
Funda iimfuno kunye nezinto ezingaqhelekanga.

Intambo ekhuselekileyo (IS) yenzelwe ukuthwala amandla ombane alinganiselweyo angenakubangela ukutsha kwiindawo eziqhumayo.

Ngokungafaniyo neentambo ezingaqhumiyo eziqulathe ukuqhuma, iintambo ze-IS zithintela iintlantsi ngokupheleleyo. Funda inkcazo yentambo ye-IS, iimfuno zokwakha, ikhowudi yombala wesheath eluhlaza okwesibhakabhaka, kunye neeparamitha zezinto ngokwe-IEC 60079-11.

Intambo ekhuselekileyo ngokwangaphakathi ayinakuvelisa okanye igcine amandla ombane aneleyo okubangela ukutsha kwiindawo eziqhumayo. Funda inkcazo, indlela ezisebenza ngayo izithintelo ezithintela amandla, isizathu sokuba amandla aphantsi (C) kunye ne-inductance ephantsi (L) zibalulekile, kunye nesizathu sokuba ikhowudi yombala oluhlaza okwesibhakabhaka iyimfuneko kwihlabathi liphela kwiindawo ezinobungozi.

Intambo yesixhobo esiKhuselekileyo (IS) ithintela amandla ombane ukuthintela ukuqhuma kwiindawo ezinobungozi. Ngokungafaniyo noyilo olungenakuqhuma (Ex-d) oluneziqhushumbisi, iintambo ze-IS ziyayeka ukutsha ngokulawula i-voltage/current. Funda ngeeshelufu eziluhlaza okwesibhakabhaka, iimfuno zokukhusela, kunye neeparamitha zezinto ngokwe-IEC 60079-11.

Iintambo ze-Intrinsically Safe (IS) zithintela amandla ombane ukuthintela ukutsha kwiindawo ezitshisayo zemigodi. Zineeparamitha ze-capacitance/inductance ezilawulwayo ezinekhowudi yombala oluhlaza okwesibhakabhaka ngokwe-IEC 60079-11, iindlela zokukhusela ezivavanyiweyo ze-Ex-ia/Ex-ib ratings, kunye noyilo lweentambo ze-sensor eziguquguqukayo zokuthobela ukhuseleko lwemigodi engaphantsi komhlaba.

Iintambo ezisicaba (iribhoni/i-FFC) zigcina indawo, zilungele ii-conductor ezininzi kwiirobhothi nakwi-automation. Zine-insulation ye-FEP (-90°C ukuya ku-+200°C), ukhetho lwe-conductor (CU/TC/SPC/NPC), kunye ne-screened okanye unscreening shield. Esi sikhokelo sigubungela ukuhanjiswa kwedatha ngesantya esiphezulu, iingenelo zoyilo oluncinci, kunye neendlela zokukhetha izicelo zerobhothi ezifuna uncedo.

Hayi, i-RS485 kunye ne-CAT6 azifani. Iintambo ze-RS485 zenzelwe unxibelelwano lwemizi-mveliso olude (1,200m) kunye ne-120Ω impedance kwiinethiwekhi zeModbus RTU. Iintambo ze-CAT6 zenzelwe i-Ethernet ekhawulezayo (100m, 100Ω impedance) kwiindawo zeofisi/i-LAN. Esi sikhokelo sithelekisa iiparameter ezibalulekileyo ezili-12+ ukunceda iinjineli zichaze ngokuchanekileyo.

Iintambo ze-RS485 kunye ne-Ethernet zisebenza ngeenjongo ezahlukeneyo kunxibelelwano lwemizi-mveliso. Esi sikhokelo sithelekisa iinkcukacha zazo, iimfuno zokukhusela, kunye nezicelo ezifanelekileyo ukukunceda wenze ukhetho olufanelekileyo.

Fumanisa isizathu Iintambo ze-RS485 ziinkokheli zemarike kwi-automation yemizi-mveliso. Funda nge-impedance (120Ω), izixhobo zokukhusela, kunye nendlela yokukhetha igeyiji efanelekileyo kwiinkqubo zeModbus kunye neCANopen.