{"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:\/\/dclcontrols.com\/cs_cz\/podpora\/ta-akutator\/imunita-aktuatoru-4-20-ma-vs-2-10-v","title":{"rendered":"Srovn\u00e1n\u00ed odolnosti proti ru\u0161en\u00ed: 4-20mA VS. 2-10V"},"content":{"rendered":"<div data-elementor-type=\"wp-post\" data-elementor-id=\"6528\" class=\"elementor elementor-6528\" data-elementor-post-type=\"post\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-c4425ee elementor-section-full_width elementor-section-height-default elementor-section-height-default\" data-id=\"c4425ee\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-592bf2f\" data-id=\"592bf2f\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-2d2988c elementor-widget elementor-widget-text-editor\" data-id=\"2d2988c\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>P\u0159i pou\u017eit\u00ed elektrick\u00fdch aktu\u00e1tor\u016f pro ochranu proti ru\u0161en\u00ed analogov\u00fd sign\u00e1l 4\u201320 mA v\u00fdrazn\u011b p\u0159ekon\u00e1v\u00e1 analogov\u00fd sign\u00e1l 2\u201310 V. Pro\u010d tomu tak je?<\/p><h2>Anal\u00fdza sign\u00e1lu 2\u201310 V<\/h2><p><img fetchpriority=\"high\" decoding=\"async\" class=\"alignnone size-medium\" src=\"\/wp-content\/uploads\/2023\/09\/dcl-2-10v-cn.webp\" width=\"1920\" height=\"1027\" \/><\/p><p><strong>Diagram ochrany proti ru\u0161en\u00ed pro sign\u00e1l 2\u201310 V (inteligentn\u00ed \u0159\u00edzen\u00ed DCL Huayi)<\/strong><\/p><p>Jak je zn\u00e1zorn\u011bno na v\u00fd\u0161e uveden\u00e9m diagramu:<\/p><p>P\u0159i pou\u017eit\u00ed 2\u201310 V je vstupn\u00ed proud sign\u00e1lu kv\u016fli vy\u0161\u0161\u00edmu vstupn\u00edmu odporu modulu (R=34K) velmi n\u00edzk\u00fd (0,059 mA \u2013 0,29 mA). D\u016fsledkem je, \u017ee pom\u011br sign\u00e1lu k \u0161umu pod\u00e9l t\u00e9to cesty je velmi n\u00edzk\u00fd, co\u017e znamen\u00e1 \u0161patnou vodivostn\u00ed a radia\u010dn\u00ed ochranu proti ru\u0161en\u00ed. Jin\u00fdmi slovy, z hlediska elektronick\u00e9ho n\u00e1vrhu je to nejzraniteln\u011bj\u0161\u00ed \u010d\u00e1st.<\/p><p>V sign\u00e1lov\u00e9 cest\u011b 2\u201310 V m\u016f\u017ee v\u00fdstupn\u00ed za\u0159\u00edzen\u00ed zajistit spr\u00e1vnost v\u00fdstupn\u00edho nap\u011bt\u00ed (Vo) pouze na stran\u011b regul\u00e1toru (proto\u017ee bod zp\u011btn\u00e9 vazby nap\u011bt\u00ed je bl\u00edzko v\u00fdstupn\u00edho pinu). Na druhou stranu nelze zaru\u010dit spr\u00e1vnost vstupn\u00edho nap\u011bt\u00ed (Vi) na stran\u011b ak\u010dn\u00edho \u010dlenu, proto\u017ee <span class=\"katex\">Vi=Vo+V\u0161um+Vzem\u011b\u2212rozd\u00edlVi = Vo + V_{\u0161um} + V_{rozd\u00edl zem\u011b}<\/span>, kde <span class=\"katex\">V\u0161umV_{\u0161um}<\/span> a <span class=\"katex\">Vground\u2212diffV_{ground-diff}<\/span> jsou vysoce n\u00e1chyln\u00e9 k ru\u0161en\u00ed, co\u017e zp\u016fsobuje nevyhnuteln\u00e9 p\u0159echodn\u00e9 zm\u011bny.<\/p><p>D\u00e9lka sign\u00e1ln\u00edho kabelu 2\u201310 V, jeho vnit\u0159n\u00ed odpor a st\u00edn\u011bn\u00ed v\u00fdznamn\u011b ovliv\u0148uj\u00ed odolnost sign\u00e1lu 2\u201310 V proti ru\u0161en\u00ed. \u010c\u00edm del\u0161\u00ed je kabel, t\u00edm vy\u0161\u0161\u00ed je vnit\u0159n\u00ed odpor a \u010d\u00edm hor\u0161\u00ed je st\u00edn\u011bn\u00ed, t\u00edm hor\u0161\u00ed je odolnost sign\u00e1lu 2\u201310 V v\u016f\u010di ru\u0161en\u00ed. Proto se 2\u201310 V b\u011b\u017en\u011b pou\u017e\u00edv\u00e1 pro komunikaci na velmi kr\u00e1tk\u00e9 vzd\u00e1lenosti.<\/p><h2>Anal\u00fdza sign\u00e1lu 4\u201320 mA<\/h2><p><img decoding=\"async\" class=\"alignnone size-medium\" src=\"\/wp-content\/uploads\/2023\/09\/dcl-4-20ma-cn.webp\" width=\"1920\" height=\"1026\" \/><\/p><p><strong>Diagram ochrany proti ru\u0161en\u00ed pro sign\u00e1l 4\u201320 mA (inteligentn\u00ed \u0159\u00edzen\u00ed DCL Huayi)<\/strong><\/p><p>Ve srovn\u00e1n\u00ed s 2\u201310 V \u0159e\u0161\u00ed sign\u00e1l 4\u201320 mA dv\u011b kritick\u00e9 slabiny sign\u00e1lu 2\u201310 V. Jak je zn\u00e1zorn\u011bno na v\u00fd\u0161e uveden\u00e9m diagramu:<\/p><p>P\u0159i pou\u017eit\u00ed 4\u201320 mA je vstupn\u00ed proud sign\u00e1lu vzhledem k ni\u017e\u0161\u00edmu vstupn\u00edmu odporu modulu (R=120 ohm\u016f) relativn\u011b vysok\u00fd (4 mA \u2013 20 mA). To m\u00e1 za n\u00e1sledek vy\u0161\u0161\u00ed pom\u011br sign\u00e1lu k \u0161umu pod\u00e9l t\u00e9to cesty, co\u017e znamen\u00e1 lep\u0161\u00ed vodivostn\u00ed a radia\u010dn\u00ed ru\u0161en\u00ed. V d\u016fsledku toho je sign\u00e1l 4\u201320 mA mnohem obt\u00ed\u017en\u011bj\u0161\u00ed ru\u0161it.<\/p><p>V sign\u00e1lov\u00e9 cest\u011b 4\u201320 mA m\u016f\u017ee v\u00fdstupn\u00ed za\u0159\u00edzen\u00ed zajistit spr\u00e1vnost cel\u00e9ho proudu v\u00fdstupn\u00ed smy\u010dky, v\u010detn\u011b proudu na v\u00fdstupn\u00ed stran\u011b i proudu na vstupu ak\u010dn\u00edho \u010dlenu. Je to proto, \u017ee c\u00edlem vzorkov\u00e1n\u00ed zp\u011btn\u00e9 vazby v\u00fdstupn\u00edho obvodu je proud na v\u00fdstupn\u00edm konci smy\u010dky 4\u201320 mA a proud je v cel\u00e9 sign\u00e1ln\u00ed smy\u010dce stejn\u00fd. Proto mus\u00ed b\u00fdt proud vzorkovan\u00fd na konci ak\u010dn\u00edho \u010dlenu stejn\u00fd jako v\u00fdstupn\u00ed proud z regul\u00e1toru. I za p\u0159\u00edtomnosti ru\u0161en\u00ed a nekonzistenc\u00ed zemn\u00edho potenci\u00e1lu m\u016f\u017ee v\u00fdstupn\u00ed obvod 4\u201320 mA zajistit spr\u00e1vnost sign\u00e1ln\u00edho proudu prost\u0159ednictv\u00edm aktivn\u00edho nastaven\u00ed negativn\u00ed zp\u011btn\u00e9 vazby.<\/p><p>D\u00e9lka sign\u00e1ln\u00edho kabelu 4\u201320 mA a jeho vnit\u0159n\u00ed odpor maj\u00ed mal\u00fd vliv na odolnost sign\u00e1lu 4\u201320 mA proti ru\u0161en\u00ed. Proto se pro komunikaci na dlouh\u00e9 vzd\u00e1lenosti b\u011b\u017en\u011b pou\u017e\u00edv\u00e1 sign\u00e1l 4\u201320 mA.<\/p><h2>Z\u00e1v\u011br<\/h2><p>Z\u00e1v\u011brem lze \u0159\u00edci, \u017ee sign\u00e1l 4\u201320 mA m\u00e1 v pr\u016fmyslov\u00e9m prost\u0159ed\u00ed v\u00fdrazn\u011b lep\u0161\u00ed odolnost proti ru\u0161en\u00ed ne\u017e sign\u00e1l 2\u201310 V. To plat\u00ed i pro aplikace zahrnuj\u00edc\u00ed elektrick\u00e9 pohony.<\/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":"<p>P\u0159i pou\u017eit\u00ed elektrick\u00fdch aktu\u00e1tor\u016f pro ochranu proti ru\u0161en\u00ed analogov\u00fd sign\u00e1l 4\u201320 mA v\u00fdrazn\u011b p\u0159ekon\u00e1v\u00e1 analogov\u00fd sign\u00e1l 2\u201310 V. Pro\u010d tomu tak je? Anal\u00fdza sign\u00e1lu 2\u201310 V Diagram ochrany proti ru\u0161en\u00ed pro sign\u00e1l 2\u201310 V (DCL Huayi Intelligent Control) Jak je zn\u00e1zorn\u011bno na v\u00fd\u0161e uveden\u00e9m diagramu: P\u0159i pou\u017eit\u00ed 2\u201310 V, v d\u016fsledku vy\u0161\u0161\u00edho vstupn\u00edho odporu modulu (R=34 K), [\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:\/\/dclcontrols.com\/cs_cz\/wp-json\/wp\/v2\/posts\/6528","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/dclcontrols.com\/cs_cz\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/dclcontrols.com\/cs_cz\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/dclcontrols.com\/cs_cz\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/dclcontrols.com\/cs_cz\/wp-json\/wp\/v2\/comments?post=6528"}],"version-history":[{"count":0,"href":"https:\/\/dclcontrols.com\/cs_cz\/wp-json\/wp\/v2\/posts\/6528\/revisions"}],"wp:attachment":[{"href":"https:\/\/dclcontrols.com\/cs_cz\/wp-json\/wp\/v2\/media?parent=6528"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/dclcontrols.com\/cs_cz\/wp-json\/wp\/v2\/categories?post=6528"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/dclcontrols.com\/cs_cz\/wp-json\/wp\/v2\/tags?post=6528"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}