{"id":20632,"date":"2026-11-02T10:09:59","date_gmt":"2026-11-02T02:09:59","guid":{"rendered":"https:\/\/www.wehopower.com\/news\/24v-power-supply-terminal-guard-service-change-review\/"},"modified":"2026-11-02T10:09:59","modified_gmt":"2026-11-02T02:09:59","slug":"24v-power-supply-terminal-guard-service-change-review","status":"publish","type":"news","link":"https:\/\/www.wehopower.com\/ur\/news\/24v-power-supply-terminal-guard-service-change-review\/","title":{"rendered":"Switching Power Supply Terminal Guarding: Review Service Changes"},"content":{"rendered":"<div class=\"weho-blog-content\">\n<p><strong>A 24V switching power supply installation needs a service record that preserves terminal protection after every approved change.<\/strong> The metal housing, terminal guard, equipment enclosure and harness each have a separate role. Changing a cover or moving a cable can alter access and cooling even when the supply part number stays the same.<\/p>\n<p>This article addresses equipment already in production. The decision is which inspection or test evidence must reopen after a service-access change. It complements an initial replacement-compatibility checklist and an installed-space comparison; its output is a controlled change record.<\/p>\n<details class=\"article-toc\" open>\n<summary>On this page<\/summary>\n<ol class=\"toc-list\">\n<li><a href=\"#record-installed-terminal-protection\">Record the installed protection boundary<\/a><\/li>\n<li><a href=\"#freeze-service-configuration\">Freeze the service configuration, not just the housing<\/a><\/li>\n<li><a href=\"#guard-and-cooling\">Check the interaction between guarding and cooling<\/a><\/li>\n<li><a href=\"#service-change-example\">Work through one service-change example<\/a><\/li>\n<li><a href=\"#release-service-evidence\">Release the change with a reproducible record<\/a><\/li>\n<\/ol>\n<\/details>\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\">\u0645\u0646\u062f\u0631\u062c\u0627\u062a \u06a9\u0627 \u062c\u062f\u0648\u0644<\/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;\">\u0679\u0648\u06af\u0644 \u06a9\u0631\u06cc\u06ba\u06d4<\/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\/ur\/news\/24v-power-supply-terminal-guard-service-change-review\/#Record_the_installed_protection_boundary\" >Record the installed protection boundary<\/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\/ur\/news\/24v-power-supply-terminal-guard-service-change-review\/#Freeze_the_service_configuration_not_just_the_housing\" >Freeze the service configuration, not just the housing<\/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\/ur\/news\/24v-power-supply-terminal-guard-service-change-review\/#Check_the_interaction_between_guarding_and_cooling\" >Check the interaction between guarding and cooling<\/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\/ur\/news\/24v-power-supply-terminal-guard-service-change-review\/#Work_through_one_service-change_example\" >Work through one service-change example<\/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\/ur\/news\/24v-power-supply-terminal-guard-service-change-review\/#Release_the_change_with_a_reproducible_record\" >Release the change with a reproducible record<\/a><\/li><\/ul><\/nav><\/div>\n<h2 id=\"record-installed-terminal-protection\"><span class=\"ez-toc-section\" id=\"Record_the_installed_protection_boundary\"><\/span>Record the installed protection boundary<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>The <a href=\"https:\/\/www.wehopower.com\/ur\/product\/lrs-series-350w-ac-to-dc-single-output-switching-power-supply\/\" data-link-role=\"product\" data-model=\"LRS-350-36\">WEHO LRS-350-36 product details<\/a> and <a href=\"https:\/\/www.wehopower.com\/ur\/product\/320w-pfc-single-output-stage-lighting-power-supply\/\" data-link-role=\"product\" data-model=\"SP-320-24\">WEHO SP-320-24 product details<\/a> identify two enclosed supply references for separate installations. The LRS photograph shows a clear cover over its terminal row; the SP photograph identifies a different terminal and cooling arrangement. Request the applicable installation drawing with the complete model suffix and revision.<\/p>\n<p><strong>Keep the electrical identities separate:<\/strong> LRS-350-36 is a 36 V reference, while SP-320-24 is a 24 V reference. Their placement here compares the records needed after a service change. It does not propose changing one supply for the other or transferring a cover, rating or installation instruction between them.<\/p>\n<figure class=\"product-reference product-scene\" id=\"figure-lrs-350-36-terminal-cover\"><a class=\"product-image scene-product-image\" href=\"https:\/\/www.wehopower.com\/ur\/product\/lrs-series-350w-ac-to-dc-single-output-switching-power-supply\/\" aria-label=\"LRS-350-36 product details\"><img loading=\"lazy\" src=\"https:\/\/www.wehopower.com\/wp-content\/uploads\/2026\/11\/85-lrs-350-36-terminal-cover-scene-edge-v7.jpg\" width=\"1254\" height=\"1254\" alt=\"Switching Power Supply Terminal Guarding: Review Service Changes  title=\" decoding=\"async\" switching power supply terminal guarding: review service changes title =\"\"><\/a><figcaption>Application illustration; exact original product photograph retained, environment AI-assisted, not a customer installation or test. The original guards and terminal geometry remain unchanged. These 36 V and 24 V specimens are separate structural references, not electrically interchangeable supplies.<\/figcaption><div class=\"image-actions\"><a href=\"https:\/\/www.wehopower.com\/wp-content\/uploads\/2026\/11\/85-lrs-350-36-terminal-cover-original.jpg\">View unchanged original product photograph<\/a><a href=\"https:\/\/www.wehopower.com\/wp-content\/uploads\/2026\/11\/85-lrs-350-36-terminal-cover-scene-edge-v7.jpg\">View full-size application illustration<\/a><a href=\"https:\/\/www.wehopower.com\/ur\/product\/lrs-series-350w-ac-to-dc-single-output-switching-power-supply\/\">LRS-350-36 product details<\/a><a href=\"https:\/\/www.wehopower.com\/wp-content\/uploads\/2026\/11\/85-lrs-350-36-terminal-cover-scene-edge-v7-layers.svg\">Inspect illustration layers (SVG)<\/a><\/div>\n<\/figure>\n<p>For each installed unit, record which barrier protects the terminal area in normal use and which parts service personnel remove. Include the guard or cover identity, retention method, surrounding equipment panels and the condition after reassembly. A visible plastic flap by itself does not establish the completed equipment\u2019s access-protection rating.<\/p>\n<p>Have qualified personnel follow the equipment\u2019s isolation and stored-energy procedure before inspection. The review does not require defeating a barrier or exposing energized terminals. Identify every relevant energy source, including any separately supplied control or output circuit.<\/p>\n<h2 id=\"freeze-service-configuration\"><span class=\"ez-toc-section\" id=\"Freeze_the_service_configuration_not_just_the_housing\"><\/span>Freeze the service configuration, not just the housing<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>The baseline should show the actual assembly with conductors terminated, secured and routed. Record terminal assignments, applicable conductor preparation and tightening requirements from the exact instructions. Include any approved ferrules or lugs, insulation position and strain management. Do not copy torque or stripping values from a visually similar supply.<\/p>\n<div class=\"weho-table-wrap\" tabindex=\"0\" role=\"region\" aria-label=\"Scrollable article table\">\n<table>\n<caption>Installed terminal-protection change record<\/caption>\n<thead>\n<tr>\n<th scope=\"col\">Item changed<\/th>\n<th scope=\"col\">Reopen this question<\/th>\n<th scope=\"col\">Evidence to retain<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Guard, flap or retaining screw<\/td>\n<td>Does the specified barrier close and remain secured?<\/td>\n<td>Accessory identity, fit inspection and applicable access assessment<\/td>\n<\/tr>\n<tr>\n<td>Wire size, ferrule or cable entry<\/td>\n<td>Are termination compatibility and insulation position preserved?<\/td>\n<td>Exact terminal instruction and completed inspection<\/td>\n<\/tr>\n<tr>\n<td>Harness restraint or service loop<\/td>\n<td>Does movement pull on terminals or prevent closure?<\/td>\n<td>Controlled route and de-energized service trial<\/td>\n<\/tr>\n<tr>\n<td>Nearby panel or added shield<\/td>\n<td>Does it alter cooling, bonding or required separation?<\/td>\n<td>Updated drawing and affected thermal\/electrical review<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<h2 id=\"guard-and-cooling\"><span class=\"ez-toc-section\" id=\"Check_the_interaction_between_guarding_and_cooling\"><\/span>Check the interaction between guarding and cooling<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>A service improvement can affect the power supply beyond tool access. An added shield may restrict a ventilation path. A cable tie may draw a bundle across a fan opening. For the SP-320-24 reference, record its pictured terminal area, fan opening and ventilation slots with the installed harness and guard. Review the specific change and the evidence it affects.<\/p>\n<figure class=\"product-reference product-scene\" id=\"figure-sp-320-24-product\"><a class=\"product-image scene-product-image\" href=\"https:\/\/www.wehopower.com\/ur\/product\/320w-pfc-single-output-stage-lighting-power-supply\/\" aria-label=\"SP-320-24 product details\"><img loading=\"lazy\" src=\"https:\/\/www.wehopower.com\/wp-content\/uploads\/2026\/11\/85-sp-320-24-product-scene-edge-v7.jpg\" width=\"1254\" height=\"1223\" alt=\"Switching Power Supply Terminal Guarding: Review Service Changes  title=\" decoding=\"async\" switching power supply terminal guarding: review service changes title =\"\"><\/a><figcaption>Application illustration; exact original product photograph retained, environment AI-assisted, not a customer installation or test. The original guards and terminal geometry remain unchanged. These 36 V and 24 V specimens are separate structural references, not electrically interchangeable supplies.<\/figcaption><div class=\"image-actions\"><a href=\"https:\/\/www.wehopower.com\/wp-content\/uploads\/2026\/11\/85-sp-320-24-product-original.jpg\">View unchanged original product photograph<\/a><a href=\"https:\/\/www.wehopower.com\/wp-content\/uploads\/2026\/11\/85-sp-320-24-product-scene-edge-v7.jpg\">View full-size application illustration<\/a><a href=\"https:\/\/www.wehopower.com\/ur\/product\/320w-pfc-single-output-stage-lighting-power-supply\/\">SP-320-24 product details<\/a><a href=\"https:\/\/www.wehopower.com\/wp-content\/uploads\/2026\/11\/85-sp-320-24-product-scene-edge-v7-layers.svg\">Inspect illustration layers (SVG)<\/a><\/div>\n<\/figure>\n<p><strong>Hypothetical thermal calculation:<\/strong> an unrelated example supply delivers 24 V at 2 A, or 48 W, at an assumed efficiency of 90%. Estimated dissipation is 48 \u00f7 0.90 \u2212 48 = <strong>5.33 W<\/strong>. A cover change can leave this dissipation unchanged while increasing the thermal resistance to surrounding air and therefore changing temperature rise.<\/p>\n<p>Those assumptions are not measured LRS-350-36 or SP-320-24 data. The calculation explains why unchanged output current does not prove an unchanged thermal installation. Compare the revised assembly under its required load, input and local conditions with the applicable manufacturer limits and the original equipment record.<\/p>\n<p><a href=\"https:\/\/www2.xppower.com\/portals\/0\/brochures\/Essential_Guide_to_Power_Supplies.pdf\" target=\"_blank\" rel=\"noopener\">XP Power\u2019s Essential Guide, Issue 3<\/a> explains how installed conditions affect thermal management. Use that general principle while obtaining WEHO\u2019s exact model instructions; the guide\u2019s model-specific examples do not set WEHO clearances or mounting requirements.<\/p>\n<h2 id=\"service-change-example\"><span class=\"ez-toc-section\" id=\"Work_through_one_service-change_example\"><\/span>Work through one service-change example<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Assume an OEM proposes a replacement terminal guard and a shorter harness on an existing assembly. Keep the supply model unchanged. First compare guard fit and retention with the controlled baseline. Then perform a de-energized removal\/reassembly trial and inspect conductor approach, restraint and closure. A drawing comparison alone cannot show whether the technician must pull on a terminated wire.<\/p>\n<figure class=\"article-relation concept-diagram\" id=\"figure-service-change-records\"><a href=\"https:\/\/www.wehopower.com\/wp-content\/uploads\/2026\/11\/85-service-change-records.svg\" aria-label=\"Open full-size Close the service-change evidence loop diagram\"><picture><source media=\"(max-width:640px)\" srcset=\"https:\/\/www.wehopower.com\/wp-content\/uploads\/2026\/11\/85-service-change-records-mobile.svg\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.wehopower.com\/wp-content\/uploads\/2026\/11\/85-service-change-records.svg\" width=\"1200\" height=\"436\" alt=\"Switching Power Supply Terminal Guarding: Review Service Changes  title=\" switching power supply terminal guarding: review service changes title =\"\"><\/picture><\/a><figcaption>Concept change-control workflow; not a measured installation or approval record.<\/figcaption><a class=\"diagram-original\" href=\"https:\/\/www.wehopower.com\/wp-content\/uploads\/2026\/11\/85-service-change-records.svg\">Open full-size diagram<\/a><\/figure>\n<p>If the new guard crosses a ventilation opening, reopen the affected thermal assessment. If the harness route changes input\/output separation or a bonding connection, ask the responsible engineer which electrical or EMC evidence needs updating. Retain the reason when evidence can carry forward; record an open action where confirmation is missing.<\/p>\n<h2 id=\"release-service-evidence\"><span class=\"ez-toc-section\" id=\"Release_the_change_with_a_reproducible_record\"><\/span>Release the change with a reproducible record<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>The release record should identify the supply, equipment revision, guard, harness and approved service sequence. Attach before\/after photographs from the same useful viewpoints, the completed inspection, any repeated tests, and the disposition of each affected requirement. Update service instructions and spare-part identification together.<\/p>\n<p><a href=\"https:\/\/www.wehopower.com\/ur\/contact\/\">Send WEHO the exact model and proposed terminal-area change<\/a> when requesting installation or accessory information. Include the existing and proposed configuration, required access and operating conditions. This gives engineering a concrete change to assess and purchasing a specific document set to request.<\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>Keep terminal protection, harness routing and cooling evidence linked when service access changes on an existing enclosed power supply installation.<\/p>","protected":false},"author":2,"featured_media":20614,"parent":0,"menu_order":1,"comment_status":"","ping_status":"","template":"","format":"standard","meta":{"_acf_changed":false,"_joinchat":[],"footnotes":""},"news_category":[284],"class_list":["post-20632","news","type-news","status-publish","format-standard","has-post-thumbnail","hentry","news_category-product-articles","entry"],"acf":[],"post_mailing_queue_ids":[],"_links":{"self":[{"href":"https:\/\/www.wehopower.com\/ur\/wp-json\/wp\/v2\/news\/20632","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.wehopower.com\/ur\/wp-json\/wp\/v2\/news"}],"about":[{"href":"https:\/\/www.wehopower.com\/ur\/wp-json\/wp\/v2\/types\/news"}],"author":[{"embeddable":true,"href":"https:\/\/www.wehopower.com\/ur\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.wehopower.com\/ur\/wp-json\/wp\/v2\/comments?post=20632"}],"version-history":[{"count":0,"href":"https:\/\/www.wehopower.com\/ur\/wp-json\/wp\/v2\/news\/20632\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.wehopower.com\/ur\/wp-json\/wp\/v2\/media\/20614"}],"wp:attachment":[{"href":"https:\/\/www.wehopower.com\/ur\/wp-json\/wp\/v2\/media?parent=20632"}],"wp:term":[{"taxonomy":"news_category","embeddable":true,"href":"https:\/\/www.wehopower.com\/ur\/wp-json\/wp\/v2\/news_category?post=20632"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}