{"id":19130,"date":"2026-10-13T14:36:42","date_gmt":"2026-10-13T06:36:42","guid":{"rendered":"https:\/\/www.wehopower.com\/news\/power-supply-hiccup-latch-off-recovery-behaviour\/"},"modified":"2026-10-13T14:36:42","modified_gmt":"2026-10-13T06:36:42","slug":"power-supply-hiccup-latch-off-recovery-behaviour","status":"publish","type":"news","link":"https:\/\/www.wehopower.com\/vi\/news\/power-supply-hiccup-latch-off-recovery-behaviour\/","title":{"rendered":"Power Supply Hiccup Mode vs Latch-Off: Specify the Recovery Behaviour"},"content":{"rendered":"<p><strong>Hiccup protection retries the output automatically; latch-off keeps it disabled until the specified reset condition is met.<\/strong> That difference affects recovery time and the possibility of a connected controller restarting. Choose the behaviour for the load and process, then verify it for the exact supply and fault type. A claim such as \u201cshort-circuit protected\u201d does not answer the recovery question.<\/p>\n<figure data-image-role=\"application_a\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/i1.wp.com\/www.wehopower.com\/wp-content\/uploads\/2026\/10\/01-application-a-69.png?quality=85&strip=all\" alt=\"Power Supply Hiccup Mode vs Latch-Off: Specify the Recovery Behaviour  title=\" width=\"1536\" height=\"1024\" power supply hiccup mode vs latch-off: specify the recovery behaviour title =\"\"><figcaption>A conditional 12 V interface branch in a dry carton-diverter control bay. Supply recovery and the machine restart command must be considered separately.<\/figcaption><\/figure>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_86 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">M\u1ee5c l\u1ee5c<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Chuy\u1ec3n \u0111\u1ed5i<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewbox=\"0 0 24 24\" version=\"1.2\" baseprofile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.wehopower.com\/vi\/news\/power-supply-hiccup-latch-off-recovery-behaviour\/#Compare_what_happens_after_protection_operates\" >Compare what happens after protection operates<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.wehopower.com\/vi\/news\/power-supply-hiccup-latch-off-recovery-behaviour\/#Read_the_protection_rows_separately\" >Read the protection rows separately<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.wehopower.com\/vi\/news\/power-supply-hiccup-latch-off-recovery-behaviour\/#Why_a_flashing_indicator_is_not_a_diagnosis\" >Why a flashing indicator is not a diagnosis<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.wehopower.com\/vi\/news\/power-supply-hiccup-latch-off-recovery-behaviour\/#Write_an_acceptance_sequence_for_the_whole_machine\" >Write an acceptance sequence for the whole machine<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.wehopower.com\/vi\/news\/power-supply-hiccup-latch-off-recovery-behaviour\/#What_to_send_with_a_supply_enquiry\" >What to send with a supply enquiry<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.wehopower.com\/vi\/news\/power-supply-hiccup-latch-off-recovery-behaviour\/#Common_buyer_questions\" >Common buyer questions<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.wehopower.com\/vi\/news\/power-supply-hiccup-latch-off-recovery-behaviour\/#Does_automatic_recovery_always_mean_hiccup\" >Does automatic recovery always mean hiccup?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.wehopower.com\/vi\/news\/power-supply-hiccup-latch-off-recovery-behaviour\/#Can_a_latch-off_supply_be_reset_repeatedly_until_the_load_starts\" >Can a latch-off supply be reset repeatedly until the load starts?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.wehopower.com\/vi\/news\/power-supply-hiccup-latch-off-recovery-behaviour\/#Is_a_higher-current_replacement_the_complete_solution\" >Is a higher-current replacement the complete solution?<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"Compare_what_happens_after_protection_operates\"><\/span>Compare what happens after protection operates<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>In hiccup operation, the supply periodically attempts to start, checks the load condition, and stops again if the fault remains. Once the fault is removed, it can resume normal output. Latch-off requires an explicit reset, often removal and restoration of input power, as defined by the manufacturer. Some products also provide an enable or reset input, but that function must be documented for the actual model.<\/p>\n<table>\n<thead>\n<tr>\n<th>Decision<\/th>\n<th>Automatic retry \/ hiccup<\/th>\n<th>Latch-off<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Fault still present<\/td>\n<td>Repeated attempts may continue<\/td>\n<td>Output remains disabled after the trip<\/td>\n<\/tr>\n<tr>\n<td>Fault removed<\/td>\n<td>May recover without an operator command<\/td>\n<td>Requires the documented reset<\/td>\n<\/tr>\n<tr>\n<td>Equipment concern<\/td>\n<td>Repeated controller starts or relay cycling<\/td>\n<td>Service access and controlled restoration<\/td>\n<\/tr>\n<tr>\n<td>Evidence required<\/td>\n<td>Retry timing and load-start behaviour<\/td>\n<td>Reset method and conditions<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>These are behavioural distinctions, not a ranking of one method as universally better. An unattended monitoring node may benefit from automatic restoration. A fixture where an unexpected restart could disturb a specimen needs process controls that remain deliberate when DC returns.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Read_the_protection_rows_separately\"><\/span>Read the protection rows separately<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>The matching WEHO MDR-20 sheet gives a useful example. For the photographed MDR-20-12, the nominal output is 12 V and up to 1.67 A. The overload row specifies 105\u2013160% and automatic recovery after the output is cut off. The overvoltage row specifies 120\u2013140% with output shutdown and recovery by powering the supply again.<\/p>\n<p>Those two rows describe different events on the same family. The phrase \u201cautomatic recovery\u201d does not, by itself, specify a hiccup pulse interval or prove the exact short-circuit waveform. Likewise, the repower instruction for overvoltage should not be copied into the overload row. Ask for the offered revision&#8217;s protection description when restart timing is part of the machine requirement.<\/p>\n<figure data-image-role=\"product_detail\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/i1.wp.com\/www.wehopower.com\/wp-content\/uploads\/2026\/10\/03-product-detail-65.png?quality=85&strip=all\" alt=\"Power Supply Hiccup Mode vs Latch-Off: Specify the Recovery Behaviour  title=\" width=\"1536\" height=\"1024\" power supply hiccup mode vs latch-off: specify the recovery behaviour title =\"\"><figcaption>The original MDR-20-12 photograph identifies the 12 V, 1.67 A example. Indicator appearance alone cannot identify which protection event occurred.<\/figcaption><\/figure>\n<h2><span class=\"ez-toc-section\" id=\"Why_a_flashing_indicator_is_not_a_diagnosis\"><\/span>Why a flashing indicator is not a diagnosis<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>A repeated start-and-stop symptom can arise when the demand remains above the output capability, when a capacitive load never finishes charging during a retry window, or when another part of the equipment repeatedly removes the input or enable signal. The visible symptom alone does not prove an internal short circuit or a failed power supply.<\/p>\n<p>Collect a time record of input availability, DC output at the supply, voltage at the receiver, and the receiver&#8217;s restart indication. Qualified personnel should use a suitable test procedure and measurement equipment. Compare results with the actual load-start requirement. Do not deliberately short the terminals as an informal way to identify the protection mode.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Write_an_acceptance_sequence_for_the_whole_machine\"><\/span>Write an acceptance sequence for the whole machine<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ol>\n<li><strong>Define the event.<\/strong> Distinguish sustained overload, output short circuit, input interruption and overvoltage. They need not produce the same recovery.<\/li>\n<li><strong>Define the permitted state.<\/strong> Decide which outputs must stay inactive while the controller loses power and boots again.<\/li>\n<li><strong>Define restoration.<\/strong> Specify whether automatic recovery is acceptable or whether an operator reset and process re-enable are required.<\/li>\n<li><strong>Validate with the real load.<\/strong> Include startup capacitance, normal demand, cable voltage drop and the receiving controller&#8217;s boot sequence.<\/li>\n<li><strong>Retain the record.<\/strong> Note the full supply model, document revision, fault procedure, observed restoration and any external reset logic.<\/li>\n<\/ol>\n<figure data-image-role=\"application_b\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/i1.wp.com\/www.wehopower.com\/wp-content\/uploads\/2026\/10\/02-application-b-66.png?quality=85&strip=all\" alt=\"Power Supply Hiccup Mode vs Latch-Off: Specify the Recovery Behaviour  title=\" width=\"1536\" height=\"1024\" power supply hiccup mode vs latch-off: specify the recovery behaviour title =\"\"><figcaption>Mechanical assembly in an optical-fixture control compartment: the supply&#x27;s rear recess engages the DIN rail. The supply terminals are still empty; this is not a powered recovery or restart test.<\/figcaption><\/figure>\n<p>Power-supply protection is not a substitute for the equipment&#8217;s safety or restart design. A restored 12 V rail may simply mean that the electronics can operate again; it does not automatically authorise a conveyor movement, a heater output or a laboratory test to resume.<\/p>\n<figure data-image-role=\"engineering_context\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/i1.wp.com\/www.wehopower.com\/wp-content\/uploads\/2026\/10\/04-engineering-context-69.png?quality=85&strip=all\" alt=\"Power Supply Hiccup Mode vs Latch-Off: Specify the Recovery Behaviour  title=\" width=\"1536\" height=\"1024\" power supply hiccup mode vs latch-off: specify the recovery behaviour title =\"\"><figcaption>Recovery logic belongs in the equipment acceptance plan. The diagram describes behaviour, not a particular pulse timing or a complete safety circuit.<\/figcaption><\/figure>\n<h2><span class=\"ez-toc-section\" id=\"What_to_send_with_a_supply_enquiry\"><\/span>What to send with a supply enquiry<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>S\u1eed d\u1ee5ng <a href=\"https:\/\/www.wehopower.com\/vi\/products\/\">WEHO catalogue<\/a> to identify the proposed series, and <a href=\"https:\/\/www.wehopower.com\/vi\/contact\/\">send WEHO the recovery requirements<\/a> together with output voltage, normal and startup current, receiving load type, restart policy and ambient conditions. Request the current protection table and reset instructions for the exact offered unit. The <a href=\"https:\/\/www.wehopower.com\/vi\/faq\/\">manufacturer&#8217;s power-supply FAQ<\/a> provides the broader protection terminology; the model-specific document remains necessary for selection.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Common_buyer_questions\"><\/span>Common buyer questions<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"Does_automatic_recovery_always_mean_hiccup\"><\/span>Does automatic recovery always mean hiccup?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>No. It states that recovery can happen without the specified manual reset, but does not establish the retry waveform or timing. Obtain the actual protection description when that difference matters.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Can_a_latch-off_supply_be_reset_repeatedly_until_the_load_starts\"><\/span>Can a latch-off supply be reset repeatedly until the load starts?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Repeated resetting does not resolve an overload, a short or an incompatible startup demand. Remove and diagnose the cause, then restore power according to the unit and equipment instructions.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Is_a_higher-current_replacement_the_complete_solution\"><\/span>Is a higher-current replacement the complete solution?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Only if the problem is genuinely insufficient capability and the replacement is compatible with the load, protection and distribution design. A larger supply can change fault energy and branch-protection requirements, so current rating alone is not a complete substitution check.<\/p>","protected":false},"excerpt":{"rendered":"<p>A protection threshold describes when a supply stops delivering power. The recovery mode determines what happens next\u2014and whether connected equipment may restart.<\/p>","protected":false},"author":2,"featured_media":19126,"parent":0,"menu_order":15,"comment_status":"","ping_status":"","template":"","format":"standard","meta":{"_acf_changed":false,"_joinchat":[],"footnotes":""},"news_category":[149,284],"class_list":["post-19130","news","type-news","status-publish","format-standard","has-post-thumbnail","hentry","news_category-blog","news_category-product-articles","entry"],"acf":[],"post_mailing_queue_ids":[],"_links":{"self":[{"href":"https:\/\/www.wehopower.com\/vi\/wp-json\/wp\/v2\/news\/19130","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.wehopower.com\/vi\/wp-json\/wp\/v2\/news"}],"about":[{"href":"https:\/\/www.wehopower.com\/vi\/wp-json\/wp\/v2\/types\/news"}],"author":[{"embeddable":true,"href":"https:\/\/www.wehopower.com\/vi\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.wehopower.com\/vi\/wp-json\/wp\/v2\/comments?post=19130"}],"version-history":[{"count":0,"href":"https:\/\/www.wehopower.com\/vi\/wp-json\/wp\/v2\/news\/19130\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.wehopower.com\/vi\/wp-json\/wp\/v2\/media\/19126"}],"wp:attachment":[{"href":"https:\/\/www.wehopower.com\/vi\/wp-json\/wp\/v2\/media?parent=19130"}],"wp:term":[{"taxonomy":"news_category","embeddable":true,"href":"https:\/\/www.wehopower.com\/vi\/wp-json\/wp\/v2\/news_category?post=19130"}],"curies":[{"name":"wp c\u1ee7a t\u00f4i","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}