{"id":31147,"date":"2026-09-17T09:39:16","date_gmt":"2026-09-17T01:39:16","guid":{"rendered":"https:\/\/www.cnspd.com\/?p=31147"},"modified":"2026-09-17T09:39:42","modified_gmt":"2026-09-17T01:39:42","slug":"ats-generator-backup-wiring-guide-a-b-source-load-generator-start-logic","status":"publish","type":"post","link":"https:\/\/www.cnspd.com\/id\/ats-generator-backup-wiring\/","title":{"rendered":"ATS Generator Backup Wiring Guide: A\/B Source, Load &#038; Generator Start Logic"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"31147\" class=\"elementor elementor-31147\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-ec6b952 e-flex e-con-boxed e-con e-parent\" data-id=\"ec6b952\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-d06e406 elementor-widget elementor-widget-html\" data-id=\"d06e406\" 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15px;\r\n    line-height: 1.5;\r\n    float: none;\r\n    position: static;\r\n  }\r\n\r\n  .leeyee-ats-generator-guide .ly-table thead {\r\n    display: table-header-group;\r\n  }\r\n\r\n  .leeyee-ats-generator-guide .ly-table tbody {\r\n    display: table-row-group;\r\n  }\r\n\r\n  .leeyee-ats-generator-guide .ly-table tr {\r\n    display: table-row;\r\n    width: auto;\r\n    float: none;\r\n  }\r\n\r\n  .leeyee-ats-generator-guide .ly-table th,\r\n  .leeyee-ats-generator-guide .ly-table td {\r\n    display: table-cell;\r\n    min-width: 0;\r\n    max-width: none;\r\n    float: none;\r\n    white-space: normal;\r\n    overflow-wrap: anywhere;\r\n    word-break: normal;\r\n    hyphens: auto;\r\n    vertical-align: top;\r\n  }\r\n\r\n  .leeyee-ats-generator-guide .ly-table thead th {\r\n    padding: 13px 14px;\r\n    border-right: 1px solid rgba(255,255,255,0.23);\r\n    background: var(--ly-blue);\r\n    color: #fff;\r\n    font-weight: 700;\r\n    text-align: left;\r\n  }\r\n\r\n  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}\r\n  }\r\n<\/style>\r\n\r\n<article class=\"leeyee-ats-generator-guide\">\r\n\r\n  <div class=\"ly-kicker\">Generator Backup ATS Guide<\/div>\r\n\r\n  <p class=\"ly-intro\">\r\n    An <strong>ATS generator backup system<\/strong> has two separate jobs that are often confused: the generator must become an available backup power source, and the automatic transfer switch must then transfer the load to that source. For a compact dual-power ATS such as the LEEYEE ATS-63, the documented terminals are for <strong>normal power A, backup power B and load output<\/strong>. The current ATS-63 documentation reviewed for this guide does not list a dedicated generator remote-start dry contact.\r\n    <a class=\"ly-ref\" href=\"#ref-1\">[1]<\/a>\r\n  <\/p>\r\n\r\n  <div class=\"ly-scope\">\r\n    <strong>Scope:<\/strong> this page explains how a compact 2P\/4P dual-power ATS works when the backup source is a generator, how A\/B\/load wiring is interpreted, and what must happen before the ATS can transfer. It does not duplicate a general \u201cWhat is an ATS?\u201d guide, and it does not claim that every ATS uses the same generator-start architecture.\r\n  <\/div>\r\n\r\n  <section class=\"ly-quick\">\r\n    <div id=\"ez-toc-container\" class=\"ez-toc-v2_0_87 counter-hierarchy ez-toc-counter ez-toc-custom ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><\/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=\"#\" data-href=\"https:\/\/www.cnspd.com\/id\/ats-generator-backup-wiring\/#quick-answer-does-this-ats-start-the-generator\" >Quick Answer: Does This ATS Start the Generator?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/id\/ats-generator-backup-wiring\/#what-does-the-leeyee-ats-63-actually-switch\" >What Does the LEEYEE ATS-63 Actually Switch?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/id\/ats-generator-backup-wiring\/#how-are-a-b-and-load-connected-on-the-2p-ats\" >How Are A, B and Load Connected on the 2P ATS?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/id\/ats-generator-backup-wiring\/#how-does-a-generator-backup-system-work-with-this-type-of-ats\" >How Does a Generator Backup System Work with This Type of ATS?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/id\/ats-generator-backup-wiring\/#why-must-the-generator-be-ready-before-the-ats-transfers\" >Why Must the Generator Be Ready Before the ATS Transfers?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/id\/ats-generator-backup-wiring\/#does-every-ats-start-the-generator\" >Does Every ATS Start the Generator?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/id\/ats-generator-backup-wiring\/#what-if-the-project-requires-automatic-generator-starting\" >What If the Project Requires Automatic Generator Starting?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/id\/ats-generator-backup-wiring\/#why-can-the-generator-be-running-but-the-ats-still-not-switch\" >Why Can the Generator Be Running but the ATS Still Not Switch?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/id\/ats-generator-backup-wiring\/#what-do-the-product-ratings-tell-a-panel-builder\" >What Do the Product Ratings Tell a Panel Builder?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/id\/ats-generator-backup-wiring\/#what-does-iec-60947-6-1-mean-here\" >What Does IEC 60947-6-1 Mean Here?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/id\/ats-generator-backup-wiring\/#2p-or-4p-for-generator-backup\" >2P or 4P for Generator Backup?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/id\/ats-generator-backup-wiring\/#information-to-confirm-before-ordering-an-ats-for-generator-backup\" >Information to Confirm Before Ordering an ATS for Generator Backup<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/id\/ats-generator-backup-wiring\/#need-to-check-whether-ats-63-fits-your-generator-backup-system\" >Need to Check Whether ATS-63 Fits Your Generator Backup System?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/id\/ats-generator-backup-wiring\/#frequently-asked-questions\" >Frequently Asked Questions<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/id\/ats-generator-backup-wiring\/#references\" >References<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"quick-answer-does-this-ats-start-the-generator\"><\/span>Quick Answer: Does This ATS Start the Generator?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n    <p>\r\n      <strong>Do not assume so.<\/strong> The LEEYEE ATS-63 product documentation currently shows Source A, Source B and Load connections, but does not document a dedicated generator-start output. In a generator-backup application, the generator therefore needs its own compatible controller or another approved automatic-start arrangement to make backup power available. Once Source B is available and acceptable, the ATS can transfer the load from Source A to Source B.\r\n      <a class=\"ly-ref\" href=\"#ref-1\">[1]<\/a>\r\n      <a class=\"ly-ref\" href=\"#ref-3\">[3]<\/a>\r\n    <\/p>\r\n\r\n    <div class=\"ly-flow\" aria-label=\"Generator backup ATS sequence\">\r\n      <div class=\"ly-flow-item\">\r\n        <span class=\"ly-flow-number\">Step 1<\/span>\r\n        <strong>Normal power A becomes unavailable<\/strong>\r\n      <\/div>\r\n\r\n      <div class=\"ly-flow-item\">\r\n        <span class=\"ly-flow-number\">Step 2<\/span>\r\n        <strong>Generator control system starts the generator<\/strong>\r\n      <\/div>\r\n\r\n      <div class=\"ly-flow-item\">\r\n        <span class=\"ly-flow-number\">Step 3<\/span>\r\n        <strong>Backup power B becomes available and stable<\/strong>\r\n      <\/div>\r\n\r\n      <div class=\"ly-flow-item\">\r\n        <span class=\"ly-flow-number\">Step 4<\/span>\r\n        <strong>ATS transfers the load to Source B<\/strong>\r\n      <\/div>\r\n    <\/div>\r\n\r\n    <div class=\"ly-cta-actions\">\r\n      <button type=\"button\"\r\n              class=\"leeyee-about-btn-light leeyee-site-popup-btn\"\r\n              aria-label=\"Confirm Generator Backup Compatibility\">\r\n        <span class=\"w-btn-label\">Confirm Generator Backup Compatibility<\/span>\r\n      <\/button>\r\n    <\/div>\r\n  <\/section>\r\n\r\n  <figure class=\"ly-figure\">\r\n    <img\r\n      src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/06\/How-automatic-transfer-switches-work.png\"\r\n      alt=\"LEEYEE ATS-63 generator backup switching sequence between utility power, backup source and load\"\r\n      loading=\"lazy\"\r\n      decoding=\"async\">\r\n    <figcaption>\r\n      Compact ATS operating concept: the ATS transfers the load only after the backup source is available. Generator starting and ATS load transfer should be treated as separate system functions unless the specific ATS documentation states otherwise.\r\n    <\/figcaption>\r\n  <\/figure>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"what-does-the-leeyee-ats-63-actually-switch\"><\/span>What Does the LEEYEE ATS-63 Actually Switch?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    The ATS-63 is documented as a compact automatic transfer switch for switching between two AC power sources. LEEYEE identifies these as <strong>common or normal power A<\/strong> and <strong>backup power B<\/strong>.\r\n    <a class=\"ly-ref\" href=\"#ref-1\">[1]<\/a>\r\n  <\/p>\r\n\r\n  <p>\r\n    In a generator-backup panel, Source A can be the utility supply and Source B can be the generator output. The load is connected to the ATS output. The ATS monitors the available sources and transfers the load according to its control logic.\r\n  <\/p>\r\n\r\n  <div class=\"ly-table-wrap\">\r\n    <table class=\"ly-table\">\r\n      <thead>\r\n        <tr>\r\n          <th>Connection<\/th>\r\n          <th>Function<\/th>\r\n          <th>Generator-Backup Meaning<\/th>\r\n        <\/tr>\r\n      <\/thead>\r\n      <tbody>\r\n        <tr>\r\n          <td data-label=\"Connection\"><strong>Source A<\/strong><\/td>\r\n          <td data-label=\"Function\">Normal \/ preferred power input.<\/td>\r\n          <td data-label=\"Generator-Backup Meaning\">Typically the utility or common power source.<\/td>\r\n        <\/tr>\r\n\r\n        <tr>\r\n          <td data-label=\"Connection\"><strong>Source B<\/strong><\/td>\r\n          <td data-label=\"Function\">Backup power input.<\/td>\r\n          <td data-label=\"Generator-Backup Meaning\">Can receive generator output when the system design matches.<\/td>\r\n        <\/tr>\r\n\r\n        <tr>\r\n          <td data-label=\"Connection\"><strong>Load<\/strong><\/td>\r\n          <td data-label=\"Function\">Common ATS output.<\/td>\r\n          <td data-label=\"Generator-Backup Meaning\">Receives power from the source selected by the ATS.<\/td>\r\n        <\/tr>\r\n      <\/tbody>\r\n    <\/table>\r\n  <\/div>\r\n\r\n  <p class=\"ly-table-note\">\r\n    Buyer meaning: the ATS selects between two electrical sources. It does not automatically mean that the ATS also provides every control function required to create those sources.\r\n  <\/p>\r\n\r\n  <div class=\"ly-key\">\r\n    <p>\r\n      <strong>Core distinction:<\/strong> \u201cgenerator backup compatible\u201d and \u201cgenerator remote-start output included\u201d are not the same statement.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"how-are-a-b-and-load-connected-on-the-2p-ats\"><\/span>How Are A, B and Load Connected on the 2P ATS?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    On the documented ATS-2P63 terminal arrangement, the top input is Backup Power B, the middle input is Normal Power A, and the lower terminals are the load output.\r\n    <a class=\"ly-ref\" href=\"#ref-1\">[1]<\/a>\r\n  <\/p>\r\n\r\n  <figure class=\"ly-figure\">\r\n    <img\r\n      src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/06\/Wiring-instructions-guide-for-ATS.png\"\r\n      alt=\"LEEYEE ATS-2P63 wiring guide showing backup power B, normal power A and load output terminals\"\r\n      loading=\"lazy\"\r\n      decoding=\"async\">\r\n    <figcaption>\r\n      LEEYEE ATS-2P63 connection guide. NB\/LB are shown for Backup Power B, NA\/LA for Normal Power A, and NC\/LC for the load output. Always follow the documentation for the exact ordered model.\r\n    <\/figcaption>\r\n  <\/figure>\r\n\r\n  <div class=\"ly-table-wrap\">\r\n    <table class=\"ly-table\">\r\n      <thead>\r\n        <tr>\r\n          <th>2P Terminal<\/th>\r\n          <th>Documented Function<\/th>\r\n          <th>Typical Project Connection<\/th>\r\n        <\/tr>\r\n      <\/thead>\r\n      <tbody>\r\n        <tr>\r\n          <td data-label=\"2P Terminal\"><strong>NB \/ LB<\/strong><\/td>\r\n          <td data-label=\"Documented Function\">Backup Power B neutral and line.<\/td>\r\n          <td data-label=\"Typical Project Connection\">Generator or another compatible AC backup source.<\/td>\r\n        <\/tr>\r\n\r\n        <tr>\r\n          <td data-label=\"2P Terminal\"><strong>NA \/ LA<\/strong><\/td>\r\n          <td data-label=\"Documented Function\">Normal Power A neutral and line.<\/td>\r\n          <td data-label=\"Typical Project Connection\">Utility \/ common power source.<\/td>\r\n        <\/tr>\r\n\r\n        <tr>\r\n          <td data-label=\"2P Terminal\"><strong>NC \/ LC<\/strong><\/td>\r\n          <td data-label=\"Documented Function\">Load neutral and line.<\/td>\r\n          <td data-label=\"Typical Project Connection\">Downstream load or distribution circuit.<\/td>\r\n        <\/tr>\r\n      <\/tbody>\r\n    <\/table>\r\n  <\/div>\r\n\r\n  <div class=\"ly-warning\">\r\n    <p>\r\n      <strong>Do not treat this table as a universal ATS terminal standard.<\/strong> It describes the documented LEEYEE ATS-2P63 arrangement shown here. A 4P version and other transfer-switch products use different conductor layouts. Installation must follow the approved wiring diagram for the exact model.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"how-does-a-generator-backup-system-work-with-this-type-of-ats\"><\/span>How Does a Generator Backup System Work with This Type of ATS?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    The safest way to understand the system is to separate <strong>generator availability<\/strong> from <strong>load transfer<\/strong>.\r\n  <\/p>\r\n\r\n  <ol class=\"ly-diagnostic\">\r\n    <li>\r\n      <strong>Utility power supplies Source A.<\/strong><br>\r\n      Under normal operating conditions, Source A supplies the load through the ATS.\r\n    <\/li>\r\n\r\n    <li>\r\n      <strong>Source A fails or becomes unacceptable.<\/strong><br>\r\n      The ATS detects the source condition according to its controller design.\r\n    <\/li>\r\n\r\n    <li>\r\n      <strong>The generator must be started by the generator-side control system.<\/strong><br>\r\n      For the ATS-63 configuration documented here, no dedicated generator-start terminal is listed in the product terminal information. If automatic generator start is required, the project needs a compatible generator controller, AMF function or another approved start arrangement.\r\n    <\/li>\r\n\r\n    <li>\r\n      <strong>Generator output appears at Source B.<\/strong><br>\r\n      The generator must first reach an electrical condition that the ATS can accept as a usable backup source.\r\n    <\/li>\r\n\r\n    <li>\r\n      <strong>The ATS transfers the load to Source B.<\/strong><br>\r\n      General ATS practice is to transfer to an alternate source only when that source is available and acceptable.\r\n      <a class=\"ly-ref\" href=\"#ref-3\">[3]<\/a>\r\n    <\/li>\r\n\r\n    <li>\r\n      <strong>Utility power returns.<\/strong><br>\r\n      The ATS retransfers the load according to its controller logic. Generator shutdown is then handled by the generator-side control arrangement unless a separate integrated control scheme has been designed.\r\n    <\/li>\r\n  <\/ol>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"why-must-the-generator-be-ready-before-the-ats-transfers\"><\/span>Why Must the Generator Be Ready Before the ATS Transfers?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    An engine-generator does not produce stable usable power at the instant its engine begins cranking. It needs time to start and establish acceptable output.\r\n  <\/p>\r\n\r\n  <p>\r\n    Eaton's ATS technical guidance describes a typical transfer sequence in which the switch transfers the load only when generator or alternate-source power is stable and within the prescribed voltage and frequency limits.\r\n    <a class=\"ly-ref\" href=\"#ref-3\">[3]<\/a>\r\n  <\/p>\r\n\r\n  <p>\r\n    This distinction also explains why <strong>ATS switching time is not the same as total backup recovery time<\/strong>. Even if the switching mechanism can change source quickly, a generator may require substantially more time to start and become available.\r\n  <\/p>\r\n\r\n  <div class=\"ly-engineering\">\r\n    <p>\r\n      <strong>Engineering meaning:<\/strong> for generator applications, check both the ATS transfer characteristics and the generator-start \/ stabilization sequence. A fast ATS does not eliminate generator start-up time.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"does-every-ats-start-the-generator\"><\/span>Does Every ATS Start the Generator?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    No. ATS products are not all built with the same control architecture.\r\n  <\/p>\r\n\r\n  <p>\r\n    Some engineered automatic transfer-switch systems include a dedicated generator-start function. Schneider Electric, for example, describes generator-start signalling as a function on ATS systems designed for that purpose.\r\n    <a class=\"ly-ref\" href=\"#ref-4\">[4]<\/a>\r\n  <\/p>\r\n\r\n  <p>\r\n    However, that does not mean every compact dual-power transfer switch includes such an output. The current LEEYEE ATS-63 documentation reviewed for this article documents Source A, Source B and Load terminals but does not list a dedicated dry-contact generator-start interface.\r\n    <a class=\"ly-ref\" href=\"#ref-1\">[1]<\/a>\r\n  <\/p>\r\n\r\n  <div class=\"ly-warning\">\r\n    <p>\r\n      <strong>Do not connect a generator remote-start input to an ATS terminal unless the product documentation explicitly identifies that terminal for generator control.<\/strong> Power-source terminals and generator-control terminals perform different functions.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"what-if-the-project-requires-automatic-generator-starting\"><\/span>What If the Project Requires Automatic Generator Starting?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    If the generator should start automatically when utility power fails, the project needs a defined method for creating that start command.\r\n  <\/p>\r\n\r\n  <p>\r\n    Depending on the generator and system architecture, this may be handled by the generator controller itself, an AMF controller, a separate monitoring relay\/control system, or an ATS specifically designed with a compatible generator-start output.\r\n  <\/p>\r\n\r\n  <p>\r\n    The correct method must be confirmed from the generator controller manual and the approved panel control schematic. Do not assume that a compact A\/B transfer switch can replace a generator auto-start controller.\r\n  <\/p>\r\n\r\n  <div class=\"ly-table-wrap\">\r\n    <table class=\"ly-table\">\r\n      <thead>\r\n        <tr>\r\n          <th>Project Requirement<\/th>\r\n          <th>What Must Be Provided<\/th>\r\n          <th>ATS-63 Consideration<\/th>\r\n        <\/tr>\r\n      <\/thead>\r\n      <tbody>\r\n        <tr>\r\n          <td data-label=\"Project Requirement\">\r\n            <strong>Switch between two live AC sources<\/strong>\r\n          <\/td>\r\n          <td data-label=\"What Must Be Provided\">\r\n            Normal A and backup B sources.\r\n          <\/td>\r\n          <td data-label=\"ATS-63 Consideration\">\r\n            ATS-63 is designed for A\/B automatic transfer when the selected product and source conditions match the project.\r\n          <\/td>\r\n        <\/tr>\r\n\r\n        <tr>\r\n          <td data-label=\"Project Requirement\">\r\n            <strong>Automatically start a generator after utility failure<\/strong>\r\n          <\/td>\r\n          <td data-label=\"What Must Be Provided\">\r\n            Generator-start control logic and a compatible remote-start interface.\r\n          <\/td>\r\n          <td data-label=\"ATS-63 Consideration\">\r\n            The ATS-63 documentation reviewed here does not list a dedicated generator-start contact.\r\n          <\/td>\r\n        <\/tr>\r\n\r\n        <tr>\r\n          <td data-label=\"Project Requirement\">\r\n            <strong>Switch only after generator output is usable<\/strong>\r\n          <\/td>\r\n          <td data-label=\"What Must Be Provided\">\r\n            Compatible source-sensing and transfer logic.\r\n          <\/td>\r\n          <td data-label=\"ATS-63 Consideration\">\r\n            Confirm the actual model voltage, frequency and application requirements before approval.\r\n          <\/td>\r\n        <\/tr>\r\n      <\/tbody>\r\n    <\/table>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"why-can-the-generator-be-running-but-the-ats-still-not-switch\"><\/span>Why Can the Generator Be Running but the ATS Still Not Switch?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    A running engine does not automatically mean Source B is electrically acceptable to the ATS.\r\n  <\/p>\r\n\r\n  <p>\r\n    If a generator is running but the ATS remains on Source A or does not complete the expected transfer, diagnose the source path before assuming that the switching mechanism has failed.\r\n  <\/p>\r\n\r\n  <div class=\"ly-table-wrap\">\r\n    <table class=\"ly-table\">\r\n      <thead>\r\n        <tr>\r\n          <th>Check<\/th>\r\n          <th>Why It Matters<\/th>\r\n          <th>Project Action<\/th>\r\n        <\/tr>\r\n      <\/thead>\r\n      <tbody>\r\n        <tr>\r\n          <td data-label=\"Check\">\r\n            <strong>Voltage at Source B<\/strong>\r\n          <\/td>\r\n          <td data-label=\"Why It Matters\">\r\n            The ATS must receive the expected backup-source voltage.\r\n          <\/td>\r\n          <td data-label=\"Project Action\">\r\n            Measure and compare it with the rating of the exact ATS model.\r\n          <\/td>\r\n        <\/tr>\r\n\r\n        <tr>\r\n          <td data-label=\"Check\">\r\n            <strong>Frequency<\/strong>\r\n          <\/td>\r\n          <td data-label=\"Why It Matters\">\r\n            Generator frequency can be unstable during start-up.\r\n          <\/td>\r\n          <td data-label=\"Project Action\">\r\n            Confirm generator output and ATS requirements.\r\n          <\/td>\r\n        <\/tr>\r\n\r\n        <tr>\r\n          <td data-label=\"Check\">\r\n            <strong>Line \/ neutral wiring<\/strong>\r\n          <\/td>\r\n          <td data-label=\"Why It Matters\">\r\n            Incorrect wiring can prevent correct source detection or safe transfer.\r\n          <\/td>\r\n          <td data-label=\"Project Action\">\r\n            Check the approved wiring diagram with power isolated.\r\n          <\/td>\r\n        <\/tr>\r\n\r\n        <tr>\r\n          <td data-label=\"Check\">\r\n            <strong>Auto \/ Manual mode<\/strong>\r\n          <\/td>\r\n          <td data-label=\"Why It Matters\">\r\n            The ATS must be in the intended operating mode.\r\n          <\/td>\r\n          <td data-label=\"Project Action\">\r\n            Verify front-panel mode and status indicators.\r\n          <\/td>\r\n        <\/tr>\r\n\r\n        <tr>\r\n          <td data-label=\"Check\">\r\n            <strong>Source preference \/ controller logic<\/strong>\r\n          <\/td>\r\n          <td data-label=\"Why It Matters\">\r\n            Transfer behaviour depends on the actual controller design.\r\n          <\/td>\r\n          <td data-label=\"Project Action\">\r\n            Use the manual for the exact product revision.\r\n          <\/td>\r\n        <\/tr>\r\n      <\/tbody>\r\n    <\/table>\r\n  <\/div>\r\n\r\n  <p class=\"ly-table-note\">\r\n    Troubleshooting boundary: electrical testing inside an energized ATS should be carried out only by qualified personnel following the equipment documentation and local electrical rules.\r\n  <\/p>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"what-do-the-product-ratings-tell-a-panel-builder\"><\/span>What Do the Product Ratings Tell a Panel Builder?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    Product markings and series data should be treated carefully. The exact delivered unit must match the approved project data rather than a generic series description.\r\n  <\/p>\r\n\r\n  <figure class=\"ly-figure ly-product-figure\">\r\n    <img\r\n      src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/06\/4.png\"\r\n      alt=\"LEEYEE ATS-2P63 side nameplate showing 63A 230VAC PC class and IEC 60947-6-1 marking\"\r\n      loading=\"lazy\"\r\n      decoding=\"async\">\r\n    <figcaption>\r\n      Example ATS-2P63 product marking. The shown unit is marked 63 A, 230 VAC, 690 VAC insulation voltage, AC230 V control voltage, PC class, 50\/60 Hz and IEC 60947-6-1. Confirm the nameplate and approved datasheet for the exact ordered variant.\r\n    <\/figcaption>\r\n  <\/figure>\r\n\r\n  <div class=\"ly-table-wrap\">\r\n    <table class=\"ly-table\">\r\n      <thead>\r\n        <tr>\r\n          <th>Item<\/th>\r\n          <th>ATS-63 Series Information<\/th>\r\n          <th>Buyer Meaning<\/th>\r\n        <\/tr>\r\n      <\/thead>\r\n      <tbody>\r\n        <tr>\r\n          <td data-label=\"Item\"><strong>Rated current<\/strong><\/td>\r\n          <td data-label=\"ATS-63 Series Information\">6 A to 63 A options.<\/td>\r\n          <td data-label=\"Buyer Meaning\">Select for the real load and project duty.<\/td>\r\n        <\/tr>\r\n\r\n        <tr>\r\n          <td data-label=\"Item\"><strong>Rated voltage<\/strong><\/td>\r\n          <td data-label=\"ATS-63 Series Information\">AC110 V \/ AC220 V \/ AC400 V configurations are listed.<\/td>\r\n          <td data-label=\"Buyer Meaning\">Confirm the exact selected variant and nameplate.<\/td>\r\n        <\/tr>\r\n\r\n        <tr>\r\n          <td data-label=\"Item\"><strong>Poles<\/strong><\/td>\r\n          <td data-label=\"ATS-63 Series Information\">2P \/ 4P.<\/td>\r\n          <td data-label=\"Buyer Meaning\">Match the phase and neutral-switching design.<\/td>\r\n        <\/tr>\r\n\r\n        <tr>\r\n          <td data-label=\"Item\"><strong>Class<\/strong><\/td>\r\n          <td data-label=\"ATS-63 Series Information\">PC.<\/td>\r\n          <td data-label=\"Buyer Meaning\">Do not assume the ATS replaces upstream protective devices.<\/td>\r\n        <\/tr>\r\n\r\n        <tr>\r\n          <td data-label=\"Item\"><strong>Frequency<\/strong><\/td>\r\n          <td data-label=\"ATS-63 Series Information\">50\/60 Hz.<\/td>\r\n          <td data-label=\"Buyer Meaning\">Generator output must match the selected ATS configuration.<\/td>\r\n        <\/tr>\r\n      <\/tbody>\r\n    <\/table>\r\n  <\/div>\r\n\r\n  <p class=\"ly-table-note\">\r\n    The example ATS-2P63 nameplate shown above uses 230 VAC wording, while the wider ATS-63 product data lists several voltage variants. For procurement approval, use the selected unit's nameplate, final datasheet and order confirmation rather than combining specifications from different variants.\r\n  <\/p>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"what-does-iec-60947-6-1-mean-here\"><\/span>What Does IEC 60947-6-1 Mean Here?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    The sample ATS-2P63 product marking references <strong>IEC 60947-6-1<\/strong>. The current IEC 60947-6-1:2026 standard applies to transfer switching equipment used to transfer a load between power-supply sources.\r\n    <a class=\"ly-ref\" href=\"#ref-2\">[2]<\/a>\r\n  <\/p>\r\n\r\n  <p>\r\n    The standard reference should not be used to invent an unlisted generator-start function. Standard scope and actual product terminals are separate questions.\r\n  <\/p>\r\n\r\n  <div class=\"ly-engineering\">\r\n    <p>\r\n      <strong>Procurement meaning:<\/strong> if a project requires a particular IEC edition, certificate, declaration or test-report scope, request the exact document for the ordered ATS model. A standard number printed on a product is not a substitute for certificate-scope verification.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"2p-or-4p-for-generator-backup\"><\/span>2P or 4P for Generator Backup?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    LEEYEE ATS-63 is available in 2P and 4P versions.\r\n    <a class=\"ly-ref\" href=\"#ref-1\">[1]<\/a>\r\n  <\/p>\r\n\r\n  <p>\r\n    Pole selection must follow the actual phase arrangement, neutral treatment, earthing system, generator configuration and local\/project rules. Do not select 2P or 4P only from the current rating.\r\n  <\/p>\r\n\r\n  <div class=\"ly-related\">\r\n    <strong>Related technical guide<\/strong>\r\n    <p>\r\n      For the broader ATS working principle, source types and general 2P\/4P selection logic, see\r\n      <a href=\"https:\/\/www.cnspd.com\/what-is-an-automatic-transfer-switch-how-ats-works-how-to-choose\/\">\r\n        What Is an Automatic Transfer Switch? How ATS Works &amp; How to Choose\r\n      <\/a>.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"information-to-confirm-before-ordering-an-ats-for-generator-backup\"><\/span>Information to Confirm Before Ordering an ATS for Generator Backup<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <div class=\"ly-check-box\">\r\n    <ul class=\"ly-checklist\">\r\n      <li>Normal source voltage and frequency.<\/li>\r\n      <li>Generator output voltage and frequency.<\/li>\r\n      <li>Single-phase or three-phase system.<\/li>\r\n      <li>Required 2P or 4P switching arrangement.<\/li>\r\n      <li>Maximum continuous load current.<\/li>\r\n      <li>Motor, pump or other inrush-current requirements where relevant.<\/li>\r\n      <li>Generator controller brand and model.<\/li>\r\n      <li>Whether the generator already has automatic-start capability.<\/li>\r\n      <li>Whether the project specifically requires an ATS generator-start contact.<\/li>\r\n      <li>Neutral and earthing arrangement.<\/li>\r\n      <li>Upstream fuse or circuit-breaker design.<\/li>\r\n      <li>DIN-rail and panel-space limits.<\/li>\r\n      <li>Required transfer behaviour and acceptable interruption time.<\/li>\r\n      <li>Applicable standard, document and certificate requirements.<\/li>\r\n      <li>Quantity and OEM label or packaging requirements.<\/li>\r\n    <\/ul>\r\n  <\/div>\r\n\r\n  <section class=\"ly-cta\">\r\n    <h2><span class=\"ez-toc-section\" id=\"need-to-check-whether-ats-63-fits-your-generator-backup-system\"><\/span>Need to Check Whether ATS-63 Fits Your Generator Backup System?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n    <p>\r\n      Send the generator controller model, source voltage, load current, phase system, pole requirement and a simple wiring diagram. LEEYEE can review whether the ATS-63 matches the source-transfer requirement and identify when the project needs separate generator-start control.\r\n    <\/p>\r\n\r\n    <div class=\"ly-cta-actions\">\r\n      <button type=\"button\"\r\n              class=\"leeyee-about-btn-light leeyee-site-popup-btn\"\r\n              aria-label=\"Request ATS Generator Backup Review\">\r\n        <span class=\"w-btn-label\">Request ATS Generator Backup Review<\/span>\r\n      <\/button>\r\n    <\/div>\r\n  <\/section>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"frequently-asked-questions\"><\/span>Frequently Asked Questions<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <div class=\"ly-faq\">\r\n\r\n    <div class=\"ly-faq-item\">\r\n      <h3>Can LEEYEE ATS-63 be used with a generator?<\/h3>\r\n      <p>\r\n        It is documented for backup-source switching and can be used with generator backup when the system voltage, current, pole arrangement, wiring and operating conditions match the ATS.\r\n        <a class=\"ly-ref\" href=\"#ref-1\">[1]<\/a>\r\n      <\/p>\r\n    <\/div>\r\n\r\n    <div class=\"ly-faq-item\">\r\n      <h3>Does LEEYEE ATS-63 automatically start the generator?<\/h3>\r\n      <p>\r\n        The current ATS-63 product documentation reviewed for this guide does not list a dedicated generator-start output. Do not assume that the ATS itself sends a remote-start signal. Confirm the generator auto-start arrangement separately.\r\n      <\/p>\r\n    <\/div>\r\n\r\n    <div class=\"ly-faq-item\">\r\n      <h3>Which ATS input should the generator use?<\/h3>\r\n      <p>\r\n        In the documented ATS-2P63 arrangement shown in this guide, Backup Power B uses the NB\/LB terminals. The exact ordered product wiring diagram remains the final authority.\r\n      <\/p>\r\n    <\/div>\r\n\r\n    <div class=\"ly-faq-item\">\r\n      <h3>Why is the generator running but the ATS not switching?<\/h3>\r\n      <p>\r\n        Check whether Source B has the correct voltage and frequency, whether line and neutral are wired correctly, whether the ATS is in the required mode, and whether the backup source meets the controller's acceptance conditions.\r\n      <\/p>\r\n    <\/div>\r\n\r\n    <div class=\"ly-faq-item\">\r\n      <h3>Can I connect the generator remote-start wires to Source B terminals?<\/h3>\r\n      <p>\r\n        No. Source B terminals are power-source connections, not automatically generator-control contacts. A generator remote-start circuit must connect only to an interface specifically documented for that control function.\r\n      <\/p>\r\n    <\/div>\r\n\r\n    <div class=\"ly-faq-item\">\r\n      <h3>Is ATS transfer time the same as generator start-up time?<\/h3>\r\n      <p>\r\n        No. Transfer time describes the switching action after the required source conditions exist. Generator start-up and stabilization occur before the generator can serve as an acceptable backup source.\r\n        <a class=\"ly-ref\" href=\"#ref-3\">[3]<\/a>\r\n      <\/p>\r\n    <\/div>\r\n\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"references\"><\/span>References<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <ol class=\"ly-references\">\r\n    <li id=\"ref-1\">\r\n      LEEYEE,\r\n      <em>ATS-63 Automatic Transfer Switch for Backup Power \u2014 2P \/ 4P Product Data and Wiring Information<\/em>.\r\n      Product information covering A\/B source switching, ATS-63 series ratings and the documented terminal arrangement.\r\n      <a href=\"https:\/\/www.cnspd.com\/products\/leeyee-automatic-transfer-switch-solar-backup\/\" target=\"_blank\" rel=\"noopener noreferrer\">LEEYEE product page<\/a>.\r\n    <\/li>\r\n\r\n    <li id=\"ref-2\">\r\n      International Electrotechnical Commission,\r\n      <em>IEC 60947-6-1:2026 \u2014 Low-voltage switchgear and controlgear \u2014 Part 6-1: Multiple function equipment \u2014 Transfer switching equipment<\/em>.\r\n      <a href=\"https:\/\/webstore.iec.ch\/en\/publication\/90494\" target=\"_blank\" rel=\"noopener noreferrer\">IEC official publication page<\/a>.\r\n    <\/li>\r\n\r\n    <li id=\"ref-3\">\r\n      Eaton,\r\n      <em>Automatic Transfer Switches (ATS) Fundamentals<\/em>.\r\n      Technical explanation of source monitoring and transfer to an alternate source after generator or backup power is stable and within applicable voltage and frequency tolerances.\r\n      <a href=\"https:\/\/www.eaton.com\/sg\/en-us\/products\/low-voltage-power-distribution-control-systems\/automatic-transfer-switches\/automatic-transfer-switch-fundamentals.html\" target=\"_blank\" rel=\"noopener noreferrer\">Eaton technical guide<\/a>.\r\n    <\/li>\r\n\r\n    <li id=\"ref-4\">\r\n      Schneider Electric \/ ASCO Power Technologies,\r\n      <em>What Is a Transfer Switch?<\/em>.\r\n      General ATS technical explanation including transfer-switch systems that incorporate generator-start signalling, illustrating why generator-start capability must be confirmed by product design rather than assumed for every ATS.\r\n      <a href=\"https:\/\/www.se.com\/us\/en\/work\/featured-articles\/what-is-a-transfer-switch\/\" target=\"_blank\" rel=\"noopener noreferrer\">Schneider Electric technical article<\/a>.\r\n    <\/li>\r\n  <\/ol>\r\n\r\n  <script>\r\n  document.addEventListener('DOMContentLoaded', function () {\r\n    var aboutPopupButtons = document.querySelectorAll('.leeyee-site-popup-btn');\r\n\r\n    aboutPopupButtons.forEach(function (button) {\r\n      button.addEventListener('click', function () {\r\n        var realPopupTrigger = document.querySelector(\r\n          '.w-popup.ush_popup_1 .w-popup-trigger'\r\n        );\r\n\r\n        if (realPopupTrigger) {\r\n          realPopupTrigger.click();\r\n        } else {\r\n          window.open(\r\n            'https:\/\/www.cnspd.com\/contact\/',\r\n            '_blank',\r\n            'noopener'\r\n          );\r\n        }\r\n      });\r\n    });\r\n  });\r\n  <\/script>\r\n\r\n<\/article>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Generator Backup ATS GuideAn ATS generator backup system has two separate jobs that are often confused: the generator must become an available backup power source, and the automatic transfer switch must then transfer the load to that source. For a compact dual-power ATS such as the LEEYEE ATS-63, the documented terminals are for normal power&#8230;<\/p>","protected":false},"author":18,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[490,1,422],"tags":[],"class_list":["post-31147","post","type-post","status-publish","format-standard","hentry","category-isolator-switching","category-news","category-industry-news"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>ATS Generator Backup Wiring: A\/B Source &amp; Load Guide<\/title>\n<meta name=\"description\" content=\"Learn how a compact dual-power ATS works with generator backup, including Source A\/B wiring, load connections, generator start boundaries, transfer logic, troubleshooting and ATS-63 selection.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.cnspd.com\/id\/ats-generator-backup-wiring\/\" \/>\n<meta property=\"og:locale\" content=\"id_ID\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"ATS Generator Backup Wiring: A\/B Source &amp; 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