{"id":597,"date":"2025-03-20T23:49:35","date_gmt":"2025-03-20T22:49:35","guid":{"rendered":"https:\/\/loxoneworks.cz\/?p=597"},"modified":"2025-05-28T14:30:00","modified_gmt":"2025-05-28T13:30:00","slug":"pojistky-pro-dc-napajeci-vetve-nutnost-nebo-zbytecnost","status":"publish","type":"post","link":"https:\/\/loxoneworks.cz\/?p=597","title":{"rendered":"Pojistky pro DC nap\u00e1jec\u00ed v\u011btve &#8211; nutnost nebo zbyte\u010dnost?"},"content":{"rendered":"\n<p>Na r\u016fzn\u00fdch f\u00f3rech se objevuj\u00ed diskuze o nutnosti ji\u0161t\u011bn\u00ed \u010di neji\u0161t\u011bn\u00ed DC nap\u00e1jec\u00edch v\u011btv\u00ed rozvod\u016f (typicky +24V pro Loxone a osv\u011btlen\u00ed atd.). Jak to m\u016f\u017ee dopadnout, si lze p\u0159e\u010d\u00edst nap\u0159. v <a href=\"https:\/\/www.vodnici.net\/2021\/01\/jak-hori-loxone\/\" target=\"_blank\" rel=\"noreferrer noopener\">tomto \u010dl\u00e1nku<\/a>.<\/p>\n\n\n\n<p>Z m\u00e9ho pohledu je nejjednodu\u0161\u0161\u00ed vsunout do nap\u00e1jec\u00ed \u010d\u00e1sti syst\u00e9movou svorku <a href=\"https:\/\/loxoneworks.cz\/?product=weidmuller-afs-pojistkova-svorka\" target=\"_blank\" rel=\"noreferrer noopener\">Weidm\u00fcller AFS 2,5CF 2C<\/a> s <a href=\"https:\/\/s.click.aliexpress.com\/e\/_oEjidVB\" target=\"_blank\" rel=\"noreferrer noopener\">pat\u0159i\u010dnou pojistkou<\/a> (Small fuse) a tu propojit h\u0159ebenem s dal\u0161\u00edmi nap\u00e1jec\u00edmi svorkami <a href=\"https:\/\/loxoneworks.cz\/?product=weidmuller-radova-svorka-a4c-25\" target=\"_blank\" rel=\"noreferrer noopener\">Weidmuller A4C 2,5<\/a>.<\/p>\n\n\n\n<p>Zaj\u00edmav\u00e1 je i varianta t\u00e9ho\u017e pojistkov\u00e9ho pouzdra s vestav\u011bnou LED diodou, signalizuj\u00edc\u00ed p\u0159eru\u0161en\u00ed pojistky. Cenov\u00fd rozd\u00edl je v\u0161ak brut\u00e1ln\u00ed &#8211; okolo 100 K\u010d za kus.<\/p>\n\n\n\n<p>\u00daprava pouzdra bez LED na LED verzi je v\u0161ak naprosto trivi\u00e1ln\u00ed &#8211; sta\u010d\u00ed <a href=\"https:\/\/s.click.aliexpress.com\/e\/_olF9p8N\" target=\"_blank\" rel=\"noreferrer noopener\">LED dioda pr\u016fm\u011bru 3mm<\/a>, rezistor (<a href=\"https:\/\/s.click.aliexpress.com\/e\/_okWeet7\" target=\"_blank\" rel=\"noreferrer noopener\">m\u016fj obl\u00edben\u00fd 47k<\/a>, kter\u00fd pou\u017e\u00edv\u00e1m i pro PIR \u010didla &#8211; plat\u00ed pro nap\u00e1jen\u00ed 24V) a vrt\u00e1k pr\u016fm\u011bru 3mm. Samoz\u0159ejm\u011b je\u0161t\u011b p\u00e1jec\u00ed stanice a <a href=\"https:\/\/s.click.aliexpress.com\/e\/_oEukjcl\" target=\"_blank\" rel=\"noreferrer noopener\">teplem smr\u0161\u0165uj\u00edc\u00ed bu\u017e\u00edrky<\/a>.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" src=\"https:\/\/loxoneworks.cz\/wp-content\/uploads\/2025\/03\/image-21.png\" alt=\"\" class=\"wp-image-599\"\/><\/figure>\n\n\n\n<p>Do pouzdra na horn\u00ed stran\u011b &#8211; bl\u00ed\u017ee p\u0159\u00edvodn\u00edmu kontaktu &#8211; je t\u0159eba vyvrtat d\u00edru pr\u016fm\u011bru 3mm (v pouzdru je nazna\u010dena poloha, kde m\u00e1 LED b\u00fdt). N\u00e1sledn\u011b je pot\u0159eba nap\u00e1jet rezistor na LED diodu &#8211; pozor na orientaci! (viz foto) &#8211; ve vhodn\u011b zvolen\u00e9m m\u00edst\u011b. V\u0161e je t\u0159eba odm\u011b\u0159it v re\u00e1lu na z\u00e1klad\u011b pou\u017eit\u00fdch sou\u010d\u00e1stek, jde to pom\u011brn\u011b lehce. Spoj je t\u0159eba izolovat <a href=\"https:\/\/s.click.aliexpress.com\/e\/_oEukjcl\" target=\"_blank\" rel=\"noreferrer noopener\">smr\u0161\u0165ovac\u00ed bu\u017e\u00edrkou<\/a>.<\/p>\n\n\n\n<p>Set diody s rezistorem se n\u00e1sledn\u011b pouze vlo\u017e\u00ed do vyvrtan\u00e9ho otvoru, jeden v\u00fdvod LED a rezistor se pat\u0159i\u010dn\u011b napru\u017e\u00ed a vymodeluj\u00ed tak, aby se tlakem op\u00edraly o pat\u0159i\u010dn\u00e1 vybr\u00e1n\u00ed v konstrukci kontakt\u016f pojistkov\u00e9ho pouzdra.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" src=\"https:\/\/loxoneworks.cz\/wp-content\/uploads\/2025\/03\/image-22.png\" alt=\"\" class=\"wp-image-600\"\/><\/figure>\n\n\n\n<p>P\u0159i tro\u0161e zru\u010dnosti a v\u011bt\u0161\u00edm po\u010dtu \u00faprav se lze dostat na cca 3 min pr\u00e1ce \/ 1 pouzdro, a to z m\u00e9ho pohledu za \u00fasporu 100 K\u010d ur\u010dit\u011b stoj\u00ed. N\u00e1klady na 1 kus jsou do 2 K\u010d.<\/p>\n\n\n\n<p>Z\u00e1v\u011brem podotknu, \u017ee pro spr\u00e1vnou funkci signalizace poruchy pojistky pomoc\u00ed LED je nutn\u00e9, aby byla zapojena  i \u010d\u00e1st, odeb\u00edraj\u00edc\u00ed proud. Okruh mus\u00ed b\u00fdt uzav\u0159en, pokud dojde k p\u0159eru\u0161en\u00ed pojistky, proud te\u010de d\u00e1le p\u0159es rezistor a z\u00e1t\u011b\u017e a t\u00edm p\u00e1dem i p\u0159es LED diodu, kter\u00e1 se rozsv\u00edt\u00ed. Bez p\u0159ipojen\u00e9 z\u00e1t\u011b\u017ee to nebude fungovat.<\/p>\n\n\n\n<p>Na z\u00e1klad\u011b dotaz\u016f p\u0159ikl\u00e1d\u00e1m odkaz na ty <a href=\"https:\/\/s.click.aliexpress.com\/e\/_oCj8aeI\" target=\"_blank\" rel=\"noreferrer noopener\">spr\u00e1vn\u00e9 pojistky<\/a> (small fuse). <\/p>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Na r\u016fzn\u00fdch f\u00f3rech se objevuj\u00ed diskuze o nutnosti ji\u0161t\u011bn\u00ed \u010di neji\u0161t\u011bn\u00ed DC nap\u00e1jec\u00edch v\u011btv\u00ed rozvod\u016f (typicky +24V pro Loxone a osv\u011btlen\u00ed atd.). Jak to m\u016f\u017ee dopadnout, si lze p\u0159e\u010d\u00edst nap\u0159. v tomto \u010dl\u00e1nku. Z m\u00e9ho pohledu je nejjednodu\u0161\u0161\u00ed vsunout do nap\u00e1jec\u00ed \u010d\u00e1sti syst\u00e9movou svorku Weidm\u00fcller AFS 2,5CF 2C s pat\u0159i\u010dnou pojistkou (Small fuse) a tu [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":601,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[17,18],"tags":[74,73],"class_list":["post-597","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-dum","category-loxone","tag-dc-napajeni","tag-pojistky"],"_links":{"self":[{"href":"https:\/\/loxoneworks.cz\/index.php?rest_route=\/wp\/v2\/posts\/597","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/loxoneworks.cz\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/loxoneworks.cz\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/loxoneworks.cz\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/loxoneworks.cz\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=597"}],"version-history":[{"count":3,"href":"https:\/\/loxoneworks.cz\/index.php?rest_route=\/wp\/v2\/posts\/597\/revisions"}],"predecessor-version":[{"id":688,"href":"https:\/\/loxoneworks.cz\/index.php?rest_route=\/wp\/v2\/posts\/597\/revisions\/688"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/loxoneworks.cz\/index.php?rest_route=\/wp\/v2\/media\/601"}],"wp:attachment":[{"href":"https:\/\/loxoneworks.cz\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=597"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/loxoneworks.cz\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=597"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/loxoneworks.cz\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=597"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}