\u00ab Normalement ouvert \u00bb et \u00ab normalement ferm\u00e9 \u00bb d\u00e9crivent l\u2019\u00e9tat du frein lorsque aucune alimentation \u00e9lectrique n\u2019est appliqu\u00e9e. Un frein normalement ferm\u00e9 est engag\u00e9 par d\u00e9faut et n\u00e9cessite de l\u2019\u00e9nergie pour le lib\u00e9rer \u2014 c\u2019est la configuration de s\u00e9curit\u00e9 courante (ressort appliqu\u00e9, d\u00e9verrouill\u00e9 par l\u2019alimentation). Un frein normalement ouvert est lib\u00e9r\u00e9 par d\u00e9faut et n\u00e9cessite de l\u2019\u00e9nergie pour l\u2019engager.<\/p>
Dans les applications critiques pour la s\u00e9curit\u00e9 comme les palans et les grues, les freins normalement ferm\u00e9s (de s\u00e9curit\u00e9) sont pr\u00e9f\u00e9r\u00e9s car une perte de courant entra\u00eene le freinage, et non un mouvement libre. Les freins normalement ouverts peuvent \u00eatre utilis\u00e9s dans les \u00e9quipements de processus contr\u00f4l\u00e9s o\u00f9 un arr\u00eat non pr\u00e9vu est dangereux ou lorsque le freinage est command\u00e9 uniquement pendant le fonctionnement et que la fiabilit\u00e9 de l'alimentation est \u00e9lev\u00e9e.<\/p>
Lors de l\u2019\u00e9valuation de l\u2019\u00ab \u00e9tat normal \u00bb, consid\u00e9rez toujours le comportement complet du syst\u00e8me en cas de d\u00e9faillance : perte de courant, c\u00e2bles cass\u00e9s, d\u00e9faillances de valves et erreurs du syst\u00e8me de contr\u00f4le. V\u00e9rifiez \u00e9galement si le frein est destin\u00e9 \u00e0 un arr\u00eat dynamique ou \u00e0 une simple fixation. Dans de nombreux cas, le terme \u00ab normalement ferm\u00e9 \u00bb est utilis\u00e9 de mani\u00e8re interchangeable avec \u00ab de s\u00e9curit\u00e9 \u00bb, mais v\u00e9rifiez la conception m\u00e9canique r\u00e9elle (ressorts appliquant une force) plut\u00f4t que de vous fier aux \u00e9tiquettes.<\/p>","protected":false},"excerpt":{"rendered":"
\u201cNormally open\u201d and \u201cnormally closed\u201d describe the brake\u2019s state when no power is applied. A normally closed brake is engaged by default and requires power to release\u2014this is the common fail-safe configuration (spring-applied, power-released). A normally open brake is released by default and requires power to engage. In safety-critical applications like hoists and cranes, normally […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[132,3],"tags":[],"class_list":["post-2276","post","type-post","status-publish","format-standard","hentry","category-faq","category-blog"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.takebrakes.com\/fr\/wp-json\/wp\/v2\/posts\/2276","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.takebrakes.com\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.takebrakes.com\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.takebrakes.com\/fr\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.takebrakes.com\/fr\/wp-json\/wp\/v2\/comments?post=2276"}],"version-history":[{"count":1,"href":"https:\/\/www.takebrakes.com\/fr\/wp-json\/wp\/v2\/posts\/2276\/revisions"}],"predecessor-version":[{"id":2277,"href":"https:\/\/www.takebrakes.com\/fr\/wp-json\/wp\/v2\/posts\/2276\/revisions\/2277"}],"wp:attachment":[{"href":"https:\/\/www.takebrakes.com\/fr\/wp-json\/wp\/v2\/media?parent=2276"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.takebrakes.com\/fr\/wp-json\/wp\/v2\/categories?post=2276"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.takebrakes.com\/fr\/wp-json\/wp\/v2\/tags?post=2276"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}