{"id":6528,"date":"2023-09-18T17:40:36","date_gmt":"2023-09-18T09:40:36","guid":{"rendered":"https:\/\/www.dcl-controls.com\/?p=6528"},"modified":"2025-03-31T07:10:42","modified_gmt":"2025-03-31T07:10:42","slug":"actuator-immunity-4-20ma-vs-2-10v","status":"publish","type":"post","link":"https:\/\/dclactuator.com\/is_is\/studningur\/ta-acutator\/onaemi-fyrir-styribunadi-4-20ma-a-moti-2-10v","title":{"rendered":"Samanbur\u00f0ur \u00e1 truflunar\u00feolsgetu: 4-20mA vs. 2-10V"},"content":{"rendered":"
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\u00deegar rafmagnsst\u00fdringar eru nota\u00f0ar til a\u00f0 verjast truflunum er 4-20mA hli\u00f0r\u00e6nt merki mun betra en 2-10V hli\u00f0r\u00e6nt merki. Hvers vegna er \u00feetta raunin?<\/p>

2-10V merkjagreining<\/h2>

<\/p>

Sk\u00fdringarmynd af truflunum fyrir 2-10V merki (DCL Huayi Intelligent Control)<\/strong><\/p>

Eins og s\u00e9st \u00e1 sk\u00fdringarmyndinni h\u00e9r a\u00f0 ofan:<\/p>

\u00deegar 2-10V er nota\u00f0, vegna h\u00e6rri inntaksvi\u00f0n\u00e1ms \u00e1 einingunni (R=34K), er inntaksmerkisstraumurinn mj\u00f6g l\u00e1gur (0,059mA \u2013 0,29mA). \u00deetta hefur \u00ed f\u00f6r me\u00f0 s\u00e9r a\u00f0 merkis-til-h\u00e1va\u00f0ahlutfalli\u00f0 \u00e1 \u00feessari lei\u00f0 er mj\u00f6g l\u00e1gt, sem \u00fe\u00fd\u00f0ir a\u00f0 lei\u00f0ni og geislunartruflanir eru l\u00e9legar. Me\u00f0 \u00f6\u00f0rum or\u00f0um, fr\u00e1 sj\u00f3narh\u00f3li rafeindah\u00f6nnunar er \u00feetta vi\u00f0kv\u00e6masti hlutinn.<\/p>

\u00cd 2-10V merkjalei\u00f0inni getur \u00fattakst\u00e6ki\u00f0 a\u00f0eins tryggt r\u00e9tta \u00fatgangsspennu (Vo) \u00e1 stj\u00f3rnhli\u00f0inni (\u00fear sem spennuvi\u00f0brag\u00f0spunkturinn er n\u00e1l\u00e6gt \u00fattakspennunni). Hins vegar er ekki h\u00e6gt a\u00f0 tryggja a\u00f0 inntaksspennan (Vi) \u00e1 st\u00fdrib\u00fana\u00f0arhli\u00f0inni s\u00e9 r\u00e9tt, \u00fear sem Vi = Vo + Vh\u00e1va\u00f0i + Vjar\u00f0mismunur Vi = Vo + V_{h\u00e1va\u00f0i} + V_{jar\u00f0mismunur}<\/span>, \u00fear sem VnoiseV_{h\u00e1va\u00f0i}<\/span> og Vjar\u00f0mismunurV_{jar\u00f0mismunur}<\/span> eru mj\u00f6g vi\u00f0kv\u00e6m fyrir truflunum, sem veldur t\u00edmabundnum breytingum sem eru \u00f3hj\u00e1kv\u00e6milegar.<\/p>

Lengd 2-10V merkjasn\u00farunnar, innri vi\u00f0n\u00e1m hennar og skj\u00f6ldur hafa veruleg \u00e1hrif \u00e1 truflunarv\u00f6rn 2-10V merkisins. \u00dev\u00ed lengri sem sn\u00faran er, \u00fev\u00ed h\u00e6rri innri vi\u00f0n\u00e1m, og \u00fev\u00ed lakari skj\u00f6ldun, \u00fev\u00ed verri er vi\u00f0n\u00e1m 2-10V merkisins gegn truflunum. \u00deess vegna er 2-10V almennt nota\u00f0 fyrir mj\u00f6g stuttar fjarskiptalei\u00f0ir.<\/p>

4-20mA merkjagreining<\/h2>

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Sk\u00fdringarmynd af truflunum gegn 4-20mA merki (DCL Huayi Intelligent Control)<\/strong><\/p>

\u00cd samanbur\u00f0i vi\u00f0 2-10V, \u00fe\u00e1 leysir 4-20mA tvo mikilv\u00e6ga veikleika 2-10V merkisins. Eins og s\u00e9st \u00e1 myndinni h\u00e9r a\u00f0 ofan:<\/p>

\u00deegar 4-20mA er nota\u00f0, vegna l\u00e6gri inntaksvi\u00f0n\u00e1ms \u00e1 einingunni (R = 120 ohm), er inntaksmerkisstraumurinn tilt\u00f6lulega h\u00e1r (4mA - 20mA). \u00deetta lei\u00f0ir til h\u00e6rra merkis-til-h\u00e1va\u00f0ahlutfalls \u00e1 \u00feessari lei\u00f0, sem \u00fe\u00fd\u00f0ir a\u00f0 lei\u00f0ni og geislunartruflanir eru betri. Fyrir viki\u00f0 er mun erfi\u00f0ara a\u00f0 trufla 4-20mA merki\u00f0.<\/p>

\u00cd 4-20mA merkjalei\u00f0inni getur \u00fattakst\u00e6ki\u00f0 tryggt r\u00e9ttm\u00e6ti alls \u00fattaksstraumsins, \u00fear \u00e1 me\u00f0al b\u00e6\u00f0i straumsins \u00e1 \u00fattakshli\u00f0inni og straumsins vi\u00f0 inntak st\u00fdrit\u00e6kisins. \u00deetta er vegna \u00feess a\u00f0 endurgj\u00f6fars\u00fdnat\u00f6kumarkmi\u00f0 \u00fattaksr\u00e1sarinnar er straumurinn vi\u00f0 \u00fattaksenda 4-20mA lykkjunnar og straumurinn er jafn \u00ed allri merkjalykkjunni. \u00deess vegna ver\u00f0ur straumurinn sem tekinn er vi\u00f0 st\u00fdrit\u00e6ki\u00f0 a\u00f0 vera s\u00e1 sami og \u00fattaksstraumurinn fr\u00e1 stj\u00f3rnt\u00e6kinu. Jafnvel \u00fe\u00f3tt truflanir og \u00f3samr\u00e6mi s\u00e9u \u00ed jar\u00f0spennu getur 4-20mA \u00fattaksr\u00e1sin tryggt r\u00e9ttm\u00e6ti merkjastraumsins me\u00f0 virkri neikv\u00e6\u00f0ri endurgj\u00f6f.<\/p>

Lengd 4-20mA merkjasn\u00farunnar og innri vi\u00f0n\u00e1m hennar hafa l\u00edtil \u00e1hrif \u00e1 truflunargetu 4-20mA merkisins. \u00deess vegna er 4-20mA almennt nota\u00f0 fyrir langdr\u00e6gar samskipti.<\/p>

Ni\u00f0ursta\u00f0a<\/h2>

A\u00f0 lokum m\u00e1 segja a\u00f0 4-20mA merki\u00f0 hefur markt\u00e6kt betri truflunarv\u00f6rn en 2-10V merki\u00f0 \u00ed i\u00f0na\u00f0arumhverfi. \u00deetta \u00e1 einnig vi\u00f0 um notkun rafkn\u00fainna st\u00fdrib\u00fana\u00f0a.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>","protected":false},"excerpt":{"rendered":"

Vi\u00f0 notkun \u00e1 truflunarv\u00f6rn rafmagnsst\u00fdringa er 4-20mA hli\u00f0r\u00e6nt merki mun betra en 2-10V hli\u00f0r\u00e6nt merki. Hvers vegna er \u00feetta raunin? 2-10V merkjagreining Truflunarv\u00f6rn fyrir 2-10V merki (DCL Huayi Intelligent Control) Eins og s\u00e9st \u00e1 sk\u00fdringarmyndinni h\u00e9r a\u00f0 ofan: \u00deegar 2-10V er nota\u00f0, vegna h\u00e6rri inntaksvi\u00f0n\u00e1ms \u00e1 einingunni (R = 34K), \u00fe\u00e1 [\u2026]<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"elementor_theme","format":"standard","meta":{"_acf_changed":true,"footnotes":""},"categories":[8],"tags":[49],"class_list":["post-6528","post","type-post","status-publish","format-standard","hentry","category-ta-acutator","tag-input-signal"],"acf":[],"_links":{"self":[{"href":"https:\/\/dclactuator.com\/is_is\/wp-json\/wp\/v2\/posts\/6528","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/dclactuator.com\/is_is\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/dclactuator.com\/is_is\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/dclactuator.com\/is_is\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/dclactuator.com\/is_is\/wp-json\/wp\/v2\/comments?post=6528"}],"version-history":[{"count":0,"href":"https:\/\/dclactuator.com\/is_is\/wp-json\/wp\/v2\/posts\/6528\/revisions"}],"wp:attachment":[{"href":"https:\/\/dclactuator.com\/is_is\/wp-json\/wp\/v2\/media?parent=6528"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/dclactuator.com\/is_is\/wp-json\/wp\/v2\/categories?post=6528"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/dclactuator.com\/is_is\/wp-json\/wp\/v2\/tags?post=6528"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}