Un VFD peut assurer une d\u00e9c\u00e9l\u00e9ration contr\u00f4l\u00e9e et m\u00eame un freinage r\u00e9g\u00e9n\u00e9ratif, mais il ne peut pas remplacer la fonction de s\u00e9curit\u00e9 d\u2019un frein m\u00e9canique. En levage, l\u2019exigence critique est de maintenir la charge en toute s\u00e9curit\u00e9 en cas de perte de courant, d\u2019arr\u00eats d\u2019urgence et de maintien de la charge \u00e0 vitesse z\u00e9ro. Si l\u2019alimentation \u00e9lectrique \u00e9choue ou si la logique de contr\u00f4le pr\u00e9sente une d\u00e9faillance, le VFD ne peut pas g\u00e9n\u00e9rer de couple \u2014 pourtant la charge veut encore descendre. Un frein m\u00e9canique de s\u00e9curit\u00e9 (actionn\u00e9 par ressort, lib\u00e9r\u00e9 par l\u2019alimentation) offre la couche de s\u00e9curit\u00e9 ind\u00e9pendante qui s\u2019engage lorsque l\u2019alimentation est coup\u00e9e.<\/p>
Les freins m\u00e9caniques offrent \u00e9galement un stationnement s\u00e9curis\u00e9 et permettent un verrouillage s\u00e9curis\u00e9 pour la maintenance. M\u00eame lors de mouvements de d\u00e9placement, compter uniquement sur le freinage VFD peut entra\u00eener un d\u00e9rapage d\u00fb au vent ou \u00e0 la pente, surtout sur des ponts roulants ext\u00e9rieurs.<\/p>
La meilleure pratique consiste \u00e0 utiliser le VFD pour une d\u00e9c\u00e9l\u00e9ration douce lors des op\u00e9rations routini\u00e8res et pour minimiser l\u2019usure du frein m\u00e9canique, tandis que le frein m\u00e9canique assure la tenue, l\u2019arr\u00eat d\u2019urgence et la conformit\u00e9 aux normes de s\u00e9curit\u00e9 des ponts roulants. Un r\u00e9glage appropri\u00e9 du timing du frein (mise en place\/d\u00e9blocage) avec le VFD \u00e9vite les chocs de charge et le glissement.<\/p>","protected":false},"excerpt":{"rendered":"
A VFD can provide controlled deceleration and even regenerative braking, but it cannot replace the safety function of a mechanical brake. In hoisting, the critical requirement is safe holding during power loss, emergency stops, and zero-speed load holding. If the electrical supply fails or control logic faults, the VFD cannot generate torque\u2014yet the load still […]<\/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":[133],"class_list":["post-2367","post","type-post","status-publish","format-standard","hentry","category-faq","category-blog","tag-overhead-or-gantry-crane"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.takebrakes.com\/fr\/wp-json\/wp\/v2\/posts\/2367","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=2367"}],"version-history":[{"count":1,"href":"https:\/\/www.takebrakes.com\/fr\/wp-json\/wp\/v2\/posts\/2367\/revisions"}],"predecessor-version":[{"id":2398,"href":"https:\/\/www.takebrakes.com\/fr\/wp-json\/wp\/v2\/posts\/2367\/revisions\/2398"}],"wp:attachment":[{"href":"https:\/\/www.takebrakes.com\/fr\/wp-json\/wp\/v2\/media?parent=2367"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.takebrakes.com\/fr\/wp-json\/wp\/v2\/categories?post=2367"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.takebrakes.com\/fr\/wp-json\/wp\/v2\/tags?post=2367"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}