{"id":31334,"date":"2026-09-28T09:52:42","date_gmt":"2026-09-28T01:52:42","guid":{"rendered":"https:\/\/www.cnspd.com\/?p=31334"},"modified":"2026-09-28T09:53:20","modified_gmt":"2026-09-28T01:53:20","slug":"compact-ats-status-indicators-explained-a-b-source-auto-manual-and-load-status","status":"publish","type":"post","link":"https:\/\/www.cnspd.com\/it\/ats-status-indicator-alarm-signal-guide\/","title":{"rendered":"Compact ATS Status Indicators Explained: A\/B Source, Auto\/Manual and Load Status"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"31334\" class=\"elementor elementor-31334\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-b455de2 e-flex e-con-boxed e-con e-parent\" data-id=\"b455de2\" 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-9e18d57 elementor-widget elementor-widget-html\" 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.ly-mobile td{\r\n    position:relative;\r\n    padding:34px 12px 11px;\r\n    border:0;\r\n    border-bottom:1px solid #e8eef3;\r\n    background:#fff;\r\n  }\r\n  #leeyee-ats-status-guide .ly-mobile td:last-child{\r\n    border-bottom:0;\r\n  }\r\n  #leeyee-ats-status-guide .ly-mobile td::before{\r\n    content:attr(data-label);\r\n    position:absolute;\r\n    top:9px;\r\n    left:12px;\r\n    width:calc(100% - 24px);\r\n    color:#294963;\r\n    font-size:13px;\r\n    font-weight:700;\r\n  }\r\n}\r\n@media(max-width:480px){\r\n  #leeyee-ats-status-guide{\r\n    padding-left:14px;\r\n    padding-right:14px;\r\n  }\r\n  #leeyee-ats-status-guide h2{\r\n    font-size:25px;\r\n  }\r\n  #leeyee-ats-status-guide .leeyee-about-btn-light{\r\n    width:100%;\r\n    min-height:50px;\r\n    padding-left:15px;\r\n    padding-right:15px;\r\n  }\r\n}\r\n<\/style>\r\n\r\n<article id=\"leeyee-ats-status-guide\">\r\n\r\n  <span class=\"ly-kicker\">Compact ATS Status Indicator Guide<\/span>\r\n\r\n  <p class=\"ly-intro\">\r\n    Compact automatic transfer switches use a simpler front-panel interface than large ATS controllers. On the LEEYEE compact ATS shown below, the user mainly sees <strong>A\/B source identification, AU\/BU indicators, Auto\/Manual control, a load-related indicator and the physical A\/B transfer position<\/strong>.\r\n  <\/p>\r\n\r\n  <p>\r\n    This guide explains how to read these <strong>ATS status indicators<\/strong> without confusing source condition with actual switch position. It also explains how common industry terms such as Source Available, Load Connected and Alarm relate to a compact ATS, and what panel builders or OEM buyers should confirm before requesting external status signals.\r\n  <\/p>\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\/it\/ats-status-indicator-alarm-signal-guide\/#quick-answer-how-should-you-read-this-compact-ats\" >Quick Answer: How Should You Read This Compact ATS?<\/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\/it\/ats-status-indicator-alarm-signal-guide\/#what-do-the-indicators-on-the-leeyee-compact-ats-show\" >What Do the Indicators on the LEEYEE Compact ATS Show?<\/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\/it\/ats-status-indicator-alarm-signal-guide\/#what-do-a-and-b-mean-on-this-ats\" >What Do A and B Mean on This 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\/it\/ats-status-indicator-alarm-signal-guide\/#what-do-au-and-bu-mean\" >What Do AU and BU Mean?<\/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\/it\/ats-status-indicator-alarm-signal-guide\/#source-status-is-not-the-same-as-ats-position\" >Source Status Is Not the Same as ATS Position<\/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\/it\/ats-status-indicator-alarm-signal-guide\/#can-both-sources-be-available-at-the-same-time\" >Can Both Sources Be Available at the Same Time?<\/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\/it\/ats-status-indicator-alarm-signal-guide\/#what-does-auto-mean-on-this-compact-ats\" >What Does Auto Mean on This Compact ATS?<\/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\/it\/ats-status-indicator-alarm-signal-guide\/#what-does-carga-on-mean\" >What Does Carga ON Mean?<\/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\/it\/ats-status-indicator-alarm-signal-guide\/#how-does-the-grid-generator-version-relate-to-a-and-b\" >How Does the Grid \/ Generator Version Relate to A and B?<\/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\/it\/ats-status-indicator-alarm-signal-guide\/#does-this-product-have-a-dedicated-fault-alarm\" >Does This Product Have a Dedicated Fault Alarm?<\/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\/it\/ats-status-indicator-alarm-signal-guide\/#can-ats-status-be-sent-to-a-plc-bms-or-remote-alarm\" >Can ATS Status Be Sent to a PLC, BMS or Remote Alarm?<\/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\/it\/ats-status-indicator-alarm-signal-guide\/#which-status-information-should-an-oem-buyer-specify\" >Which Status Information Should an OEM Buyer Specify?<\/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\/it\/ats-status-indicator-alarm-signal-guide\/#do-not-confuse-generator-start-with-ats-status-feedback\" >Do Not Confuse Generator Start with ATS Status Feedback<\/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\/it\/ats-status-indicator-alarm-signal-guide\/#dry-contacts-and-modbus-are-interfaces-not-status-definitions\" >Dry Contacts and Modbus Are Interfaces, Not Status Definitions<\/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\/it\/ats-status-indicator-alarm-signal-guide\/#how-do-larger-ats-controllers-use-different-status-terms\" >How Do Larger ATS Controllers Use Different Status Terms?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/it\/ats-status-indicator-alarm-signal-guide\/#what-does-iec-60947-6-1-2026-cover\" >What Does IEC 60947-6-1:2026 Cover?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/it\/ats-status-indicator-alarm-signal-guide\/#before-ordering-compact-ats-status-checklist\" >Before Ordering: Compact ATS Status Checklist<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/it\/ats-status-indicator-alarm-signal-guide\/#need-to-confirm-ats-status-or-interface-requirements\" >Need to Confirm ATS Status or Interface Requirements?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-19\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/it\/ats-status-indicator-alarm-signal-guide\/#related-ats-information\" >Related ATS Information<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-20\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/it\/ats-status-indicator-alarm-signal-guide\/#compact-ats-status-indicator-faq\" >Compact ATS Status Indicator FAQ<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-21\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/it\/ats-status-indicator-alarm-signal-guide\/#references\" >References<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"quick-answer-how-should-you-read-this-compact-ats\"><\/span>Quick Answer: How Should You Read This Compact ATS?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n    <p>\r\n      Read the panel in three separate layers:\r\n    <\/p>\r\n\r\n    <ul>\r\n      <li><strong>Source-related status:<\/strong> the A-side and B-side indications provide information associated with the two incoming sources.<\/li>\r\n      <li><strong>Actual transfer position:<\/strong> the A\/B mechanism position shows which side the switching mechanism is physically connected to.<\/li>\r\n      <li><strong>Operating mode:<\/strong> Auto and Manual identify how the ATS is being operated.<\/li>\r\n    <\/ul>\r\n\r\n    <div class=\"ly-key\">\r\n      Source status and switch position are different information. A source can be present or acceptable while the ATS remains connected to the other source.\r\n    <\/div>\r\n\r\n    <p>\r\n      Do not assume that a compact ATS provides the same dedicated Normal Available, Emergency Available, Load on Normal, Fault Alarm, dry-contact or Modbus indications found on larger ATS controllers.\r\n    <\/p>\r\n  <\/section>\r\n\r\n  <figure class=\"ly-figure ly-product-photo\">\r\n    <img fetchpriority=\"high\" decoding=\"async\"\r\n      src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/06\/2.png\"\r\n      alt=\"LEEYEE ATS-2P63 and ATS-4P63 compact automatic transfer switches with A B source indicators Auto Manual control and load status indicator\"\r\n      width=\"640\"\r\n      height=\"640\"\r\n      loading=\"eager\"\r\n      fetchpriority=\"high\">\r\n    <figcaption>\r\n      Figure 1. Real LEEYEE ATS-2P63 and ATS-4P63 products. The visible front panel includes A\/B source identification, AU\/BU indicators, Auto\/Manual control, a load-related indicator and the A\/B transfer position.\r\n    <\/figcaption>\r\n  <\/figure>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"what-do-the-indicators-on-the-leeyee-compact-ats-show\"><\/span>What Do the Indicators on the LEEYEE Compact ATS Show?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    The product photograph gives a much better starting point than a generic ATS-controller illustration because it shows the interface the buyer will actually receive.\r\n  <\/p>\r\n\r\n  <div class=\"ly-table-wrap ly-mobile\">\r\n    <table>\r\n      <thead>\r\n        <tr>\r\n          <th style=\"width:28%\">Visible item<\/th>\r\n          <th style=\"width:35%\">What can be stated safely<\/th>\r\n          <th style=\"width:37%\">What still needs confirmation<\/th>\r\n        <\/tr>\r\n      <\/thead>\r\n      <tbody>\r\n        <tr>\r\n          <td data-label=\"Visible item\"><strong>A \/ B<\/strong><\/td>\r\n          <td data-label=\"Safe interpretation\">Identifies the two source or transfer positions on the ATS.<\/td>\r\n          <td data-label=\"Confirm\">Which project source is wired to A and which is wired to B.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Visible item\"><strong>AU \/ BU<\/strong><\/td>\r\n          <td data-label=\"Safe interpretation\">A-side and B-side source-related indicator labels visible on the product.<\/td>\r\n          <td data-label=\"Confirm\">The exact electrical conditions that turn AU and BU on or off.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Visible item\"><strong>Auto<\/strong><\/td>\r\n          <td data-label=\"Safe interpretation\">Relates to automatic ATS operation.<\/td>\r\n          <td data-label=\"Confirm\">The exact automatic transfer and recovery sequence for the selected version.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Visible item\"><strong>Manual<\/strong><\/td>\r\n          <td data-label=\"Safe interpretation\">Relates to manual operation of the transfer mechanism.<\/td>\r\n          <td data-label=\"Confirm\">The approved operating procedure before manual switching.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Visible item\"><strong>Carga ON<\/strong><\/td>\r\n          <td data-label=\"Safe interpretation\">A load-related status indication printed on the product.<\/td>\r\n          <td data-label=\"Confirm\">The exact electrical condition represented by the indicator.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Visible item\"><strong>A \/ B mechanism position<\/strong><\/td>\r\n          <td data-label=\"Safe interpretation\">Shows the physical transfer position of the switching mechanism.<\/td>\r\n          <td data-label=\"Confirm\">Which source assignment corresponds to each position in the project.<\/td>\r\n        <\/tr>\r\n      <\/tbody>\r\n    <\/table>\r\n  <\/div>\r\n\r\n  <p class=\"ly-table-note\">\r\n    Important: the product photo confirms the labels that are physically present. It does not, by itself, prove the exact internal logic behind AU, BU or Carga ON. Use the model-specific wiring and operating documentation for that confirmation.\r\n  <\/p>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"what-do-a-and-b-mean-on-this-ats\"><\/span>What Do A and B Mean on This ATS?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    A and B identify the two source sides and the two transfer positions of the compact ATS.\r\n  <\/p>\r\n\r\n  <p>\r\n    In a typical backup system, one side may be assigned to the normal supply and the other to the backup supply. However, <strong>A should not automatically be described as utility and B should not automatically be described as generator<\/strong> unless the project wiring and model documentation define them that way.\r\n  <\/p>\r\n\r\n  <div class=\"ly-warning\">\r\n    <span class=\"ly-label\">Project rule<\/span>\r\n    Always define the A\/B source assignment on the approved wiring diagram. This prevents panel labels, remote status descriptions and commissioning records from using different terminology.\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"what-do-au-and-bu-mean\"><\/span>What Do AU and BU Mean?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    AU and BU are clearly visible beside the A-side and B-side indicator lamps on the LEEYEE product.\r\n  <\/p>\r\n\r\n  <p>\r\n    Without the model-specific indicator logic, the technically safe description is <strong>A-side source-related status<\/strong> and <strong>B-side source-related status<\/strong>. It would be inaccurate to rename them Normal Source Available and Emergency Source Available based only on appearance.\r\n  <\/p>\r\n\r\n  <div class=\"ly-note\">\r\n    <span class=\"ly-label\">Why this matters<\/span>\r\n    If an OEM buyer wants AU or BU repeated on an external panel, first confirm exactly what electrical condition each indicator represents. An external label should describe the actual signal, not an assumed meaning.\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"source-status-is-not-the-same-as-ats-position\"><\/span>Source Status Is Not the Same as ATS Position<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    This distinction is central to ATS operation and is also used by larger industrial ATS controllers. Manufacturers such as ASCO and Eaton distinguish between the condition of a source and whether the transfer mechanism is actually connected to that source. <sup><a href=\"#ref-2\">[2]<\/a><\/sup><sup><a href=\"#ref-4\">[4]<\/a><\/sup>\r\n  <\/p>\r\n\r\n  <div class=\"ly-grid\">\r\n    <div class=\"ly-card\">\r\n      <strong>Source-related indication<\/strong>\r\n      Describes information about source A or source B according to the controller logic.\r\n    <\/div>\r\n\r\n    <div class=\"ly-card\">\r\n      <strong>Physical A\/B position<\/strong>\r\n      Describes the actual transfer position of the switching mechanism.\r\n    <\/div>\r\n  <\/div>\r\n\r\n  <figure class=\"ly-figure ly-diagram\">\r\n    <img loading=\"lazy\" decoding=\"async\"\r\n      src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/09\/ats-source-available-vs-load-connected.webp\"\r\n      alt=\"ATS engineering diagram showing that source availability and actual load connection are different operating states\"\r\n      width=\"1448\"\r\n      height=\"1086\"\r\n      loading=\"lazy\">\r\n    <figcaption>\r\n      Figure 2. Engineering concept only: both sources can be available while an open-transition ATS remains connected to one source. This diagram explains the logic; it is not a photograph of the LEEYEE ATS.\r\n    <\/figcaption>\r\n  <\/figure>\r\n\r\n  <div class=\"ly-key\">\r\n    Source condition answers: \u201cWhat is happening on source A or B?\u201d Transfer position answers: \u201cWhich side is the ATS actually connected to?\u201d\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"can-both-sources-be-available-at-the-same-time\"><\/span>Can Both Sources Be Available at the Same Time?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    Yes. In a two-source transfer system, both incoming sources can be energized or acceptable while an open-transition ATS remains connected to only one source.\r\n  <\/p>\r\n\r\n  <p>\r\n    This is why a source-related indicator should not automatically be interpreted as proof that the load has transferred to that source.\r\n  <\/p>\r\n\r\n  <div class=\"ly-warning\">\r\n    <span class=\"ly-label\">Do not confuse availability with paralleling<\/span>\r\n    Two sources being available does not mean both sources are feeding the load simultaneously. LEEYEE's standard compact ATS application should not be presented as a closed-transition or source-paralleling system unless specific product documentation confirms otherwise.\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"what-does-auto-mean-on-this-compact-ats\"><\/span>What Does Auto Mean on This Compact ATS?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    The product front panel includes an Auto indication and a Manual control. These are highly relevant to the actual product and should be treated as core operating information.\r\n  <\/p>\r\n\r\n  <div class=\"ly-grid\">\r\n    <div class=\"ly-card\">\r\n      <strong>Auto<\/strong>\r\n      Indicates operation associated with the ATS automatic transfer logic.\r\n    <\/div>\r\n\r\n    <div class=\"ly-card\">\r\n      <strong>Manual<\/strong>\r\n      Provides or identifies manual operation of the transfer mechanism according to the product procedure.\r\n    <\/div>\r\n  <\/div>\r\n\r\n  <p>\r\n    Manual operation should not automatically be described as a fault. Larger ATS controllers may provide a separate \u201cNot in Auto\u201d alarm or status output, but that function should not be assumed on this compact model.\r\n  <\/p>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"what-does-carga-on-mean\"><\/span>What Does Carga ON Mean?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    The product front panel includes the text <strong>Carga ON<\/strong>. \u201cCarga\u201d is Spanish for \u201cload,\u201d so the label is clearly load-related.\r\n  <\/p>\r\n\r\n  <p>\r\n    However, the photograph alone does not establish the precise sensing logic behind the indicator. It should therefore not be rewritten as \u201cLoad on Normal\u201d or \u201cLoad on Emergency.\u201d\r\n  <\/p>\r\n\r\n  <div class=\"ly-key\">\r\n    A load-related indicator and the A\/B transfer position answer different questions. Do not use one as a substitute for the other unless the product documentation explicitly defines that relationship.\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"how-does-the-grid-generator-version-relate-to-a-and-b\"><\/span>How Does the Grid \/ Generator Version Relate to A and B?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    The 4P product photograph also shows <strong>Generador<\/strong> and <strong>Red<\/strong> markings. These identify generator and grid application concepts on that product version.\r\n  <\/p>\r\n\r\n  <p>\r\n    For project drawings, the correct approach is still to document which terminals and A\/B position correspond to the grid and generator sources. Do not rely on visual assumptions when approving the panel wiring.\r\n  <\/p>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"does-this-product-have-a-dedicated-fault-alarm\"><\/span>Does This Product Have a Dedicated Fault Alarm?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    The visible front panel shown in the LEEYEE product photograph does not show a dedicated large-controller-style <strong>FAULT<\/strong>, <strong>COMMON ALARM<\/strong> or alarm-code display.\r\n  <\/p>\r\n\r\n  <p>\r\n    Larger ATS controllers from ABB, ASCO and Eaton can provide dedicated alarm indications, event information or programmable alarm outputs. Those features are useful for explaining industry terminology, but they should not be presented as standard functions of this compact LEEYEE ATS without model-specific confirmation. <sup><a href=\"#ref-2\">[2]<\/a><\/sup><sup><a href=\"#ref-3\">[3]<\/a><\/sup><sup><a href=\"#ref-4\">[4]<\/a><\/sup>\r\n  <\/p>\r\n\r\n  <div class=\"ly-note\">\r\n    <span class=\"ly-label\">Buyer meaning<\/span>\r\n    If your project requires a dedicated fault alarm, common alarm or remote alarm contact, include it in the enquiry and confirm availability before model approval.\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"can-ats-status-be-sent-to-a-plc-bms-or-remote-alarm\"><\/span>Can ATS Status Be Sent to a PLC, BMS or Remote Alarm?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    In the wider ATS market, status information can be exported through auxiliary contacts, programmable relay outputs or communication interfaces. Some industrial controllers also support digital communication.\r\n  <\/p>\r\n\r\n  <p>\r\n    This is an <strong>industry monitoring concept<\/strong>, not a claim that every compact ATS provides those interfaces. For the LEEYEE compact model, do not assume independent Source Available contacts, Common Alarm, BMS communication, RS485 or Modbus unless those functions are listed in the approved model documentation.\r\n  <\/p>\r\n\r\n  <figure class=\"ly-figure ly-diagram\">\r\n    <img loading=\"lazy\" decoding=\"async\"\r\n      src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/09\/ats-status-signal-remote-monitoring-flow.webp\"\r\n      alt=\"Conceptual ATS status signal flow from local indicators through optional outputs to PLC BMS or remote alarm systems\"\r\n      width=\"1448\"\r\n      height=\"1086\"\r\n      loading=\"lazy\">\r\n    <figcaption>\r\n      Figure 3. Industry monitoring concept, not a standard ATS-2P63 \/ ATS-4P63 feature diagram. Dry contacts, relay outputs and communication interfaces must be confirmed for the actual model.\r\n    <\/figcaption>\r\n  <\/figure>\r\n\r\n  <div class=\"ly-key\">\r\n    First define which ATS state the project needs to monitor. Then confirm whether the selected product provides an output for that state.\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"which-status-information-should-an-oem-buyer-specify\"><\/span>Which Status Information Should an OEM Buyer Specify?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    A useful ATS enquiry should describe the information required by the panel or monitoring system rather than asking generically for \u201calarm contacts.\u201d\r\n  <\/p>\r\n\r\n  <div class=\"ly-table-wrap ly-mobile\">\r\n    <table>\r\n      <thead>\r\n        <tr>\r\n          <th>Required information<\/th>\r\n          <th>Why it matters<\/th>\r\n          <th>What to confirm<\/th>\r\n        <\/tr>\r\n      <\/thead>\r\n      <tbody>\r\n        <tr>\r\n          <td data-label=\"Information\"><strong>A-side source status<\/strong><\/td>\r\n          <td data-label=\"Purpose\">Understand the condition associated with source A<\/td>\r\n          <td data-label=\"Confirm\">Exact AU logic and whether external output is available<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Information\"><strong>B-side source status<\/strong><\/td>\r\n          <td data-label=\"Purpose\">Understand the condition associated with source B<\/td>\r\n          <td data-label=\"Confirm\">Exact BU logic and whether external output is available<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Information\"><strong>A\/B transfer position<\/strong><\/td>\r\n          <td data-label=\"Purpose\">Confirm which source position is selected<\/td>\r\n          <td data-label=\"Confirm\">Whether remote position feedback is required and supported<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Information\"><strong>Auto \/ Manual status<\/strong><\/td>\r\n          <td data-label=\"Purpose\">Know the operating mode<\/td>\r\n          <td data-label=\"Confirm\">Whether mode feedback is available externally<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Information\"><strong>Alarm requirement<\/strong><\/td>\r\n          <td data-label=\"Purpose\">Notify a remote operator of an abnormal condition<\/td>\r\n          <td data-label=\"Confirm\">Whether the selected model provides the required alarm output<\/td>\r\n        <\/tr>\r\n      <\/tbody>\r\n    <\/table>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"do-not-confuse-generator-start-with-ats-status-feedback\"><\/span>Do Not Confuse Generator Start with ATS Status Feedback<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <div class=\"ly-grid\">\r\n    <div class=\"ly-card\">\r\n      <strong>Generator start command<\/strong>\r\n      Tells the generator controller that an action is required.\r\n    <\/div>\r\n\r\n    <div class=\"ly-card\">\r\n      <strong>ATS status feedback<\/strong>\r\n      Tells an external system what ATS condition or position currently exists.\r\n    <\/div>\r\n  <\/div>\r\n\r\n  <p>\r\n    These are different signal directions. A project may require one, both or neither, depending on the generator controller and ATS design.\r\n  <\/p>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"dry-contacts-and-modbus-are-interfaces-not-status-definitions\"><\/span>Dry Contacts and Modbus Are Interfaces, Not Status Definitions<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    \u201cSource A status,\u201d \u201cATS position\u201d and \u201calarm\u201d describe information. Dry contacts, relay outputs or Modbus describe ways of transporting information.\r\n  <\/p>\r\n\r\n  <p>\r\n    This distinction prevents a common procurement error: requesting \u201cModbus\u201d without defining what the BMS must actually read, or requesting \u201cdry contacts\u201d without specifying which states are required.\r\n  <\/p>\r\n\r\n  <div class=\"ly-note\">\r\n    <span class=\"ly-label\">Panel-builder rule<\/span>\r\n    Define the required state first. Then verify whether the selected ATS provides a suitable terminal, auxiliary contact or communication interface.\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"how-do-larger-ats-controllers-use-different-status-terms\"><\/span>How Do Larger ATS Controllers Use Different Status Terms?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    Larger ATS controllers commonly use more detailed terminology. Schneider Electric \/ ASCO documentation separates <strong>Normal Source Accepted<\/strong>, <strong>Emergency Source Accepted<\/strong>, <strong>Load on Normal<\/strong> and <strong>Load on Emergency<\/strong>. Eaton documentation similarly separates Source Available and Source Connected states on applicable controllers. <sup><a href=\"#ref-2\">[2]<\/a><\/sup><sup><a href=\"#ref-4\">[4]<\/a><\/sup>\r\n  <\/p>\r\n\r\n  <p>\r\n    These terms explain the engineering logic behind ATS monitoring, but they should not be copied onto the LEEYEE compact ATS unless the corresponding function actually exists on the selected model.\r\n  <\/p>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"what-does-iec-60947-6-1-2026-cover\"><\/span>What Does IEC 60947-6-1:2026 Cover?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    IEC 60947-6-1:2026 covers transfer switching equipment and includes automatic transfer switching equipment and ATS controllers. <sup><a href=\"#ref-1\">[1]<\/a><\/sup>\r\n  <\/p>\r\n\r\n  <p>\r\n    The standard provides the overall transfer-switching equipment framework. It does not mean all ATS products must use identical indicator names, front-panel layouts, auxiliary contacts or communication interfaces. Those details remain product-specific.\r\n  <\/p>\r\n\r\n  <section class=\"ly-checklist\">\r\n    <h2><span class=\"ez-toc-section\" id=\"before-ordering-compact-ats-status-checklist\"><\/span>Before Ordering: Compact ATS Status Checklist<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n    <ul>\r\n      <li>System voltage and frequency<\/li>\r\n      <li>Rated current<\/li>\r\n      <li>2P or 4P configuration<\/li>\r\n      <li>Which source is connected to A<\/li>\r\n      <li>Which source is connected to B<\/li>\r\n      <li>Grid \/ generator or other two-source application<\/li>\r\n      <li>Required Auto \/ Manual operation<\/li>\r\n      <li>Required source-status indication<\/li>\r\n      <li>Required transfer-position feedback<\/li>\r\n      <li>Required load-related indication<\/li>\r\n      <li>Required fault or common alarm output, if any<\/li>\r\n      <li>Required NO \/ NC \/ COM contacts, if any<\/li>\r\n      <li>PLC \/ BMS interface requirement, if any<\/li>\r\n      <li>RS485 \/ Modbus requirement, if any<\/li>\r\n      <li>OEM front-panel or terminal-label requirement<\/li>\r\n    <\/ul>\r\n  <\/section>\r\n\r\n  <section class=\"ly-cta\">\r\n    <h2><span class=\"ez-toc-section\" id=\"need-to-confirm-ats-status-or-interface-requirements\"><\/span>Need to Confirm ATS Status or Interface Requirements?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n    <p>\r\n      Send your system voltage, current, 2P\/4P requirement, A\/B source arrangement and any external status signals required by the project. LEEYEE can confirm the suitable compact ATS configuration and the available interface before model approval.\r\n    <\/p>\r\n\r\n    <button type=\"button\"\r\n            class=\"leeyee-about-btn-light leeyee-site-popup-btn\"\r\n            aria-label=\"Confirm ATS Status Requirements\">\r\n      <span class=\"w-btn-label\">Confirm ATS Status Requirements<\/span>\r\n    <\/button>\r\n  <\/section>\r\n\r\n  <section class=\"ly-related\">\r\n    <h2><span class=\"ez-toc-section\" id=\"related-ats-information\"><\/span>Related ATS Information<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n    <ul>\r\n      <li>\r\n        <a href=\"https:\/\/www.cnspd.com\/what-is-an-automatic-transfer-switch-how-ats-works-how-to-choose\/\">\r\n          Automatic Transfer Switch Selection Guide\r\n        <\/a>\r\n        \u2014 ATS operating principles, poles and general model selection.\r\n      <\/li>\r\n      <li>\r\n        <a href=\"https:\/\/www.cnspd.com\/products\/leeyee-automatic-transfer-switch-solar-backup\/\">\r\n          LEEYEE Compact Automatic Transfer Switch\r\n        <\/a>\r\n        \u2014 published ATS product specifications and application information.\r\n      <\/li>\r\n    <\/ul>\r\n  <\/section>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"compact-ats-status-indicator-faq\"><\/span>Compact ATS Status Indicator FAQ<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <div class=\"ly-faq\">\r\n    <h3>What do A and B mean on the LEEYEE ATS?<\/h3>\r\n    <p>\r\n      A and B identify the two source or transfer positions. The project wiring diagram should define which actual power source is assigned to each side.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <div class=\"ly-faq\">\r\n    <h3>What do AU and BU mean?<\/h3>\r\n    <p>\r\n      AU and BU are source-related indicator labels associated with the A and B sides. Their exact electrical switching logic should be confirmed from the model-specific documentation rather than inferred only from the product photograph.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <div class=\"ly-faq\">\r\n    <h3>Is a source indicator the same as the A\/B transfer position?<\/h3>\r\n    <p>\r\n      No. A source-related indication describes the condition associated with a source. The physical A\/B position describes where the switching mechanism is actually positioned.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <div class=\"ly-faq\">\r\n    <h3>Can both sources be available at the same time?<\/h3>\r\n    <p>\r\n      Yes. Both incoming sources can be available while an open-transition ATS remains connected to only one source.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <div class=\"ly-faq\">\r\n    <h3>Does Manual mean there is an ATS fault?<\/h3>\r\n    <p>\r\n      No. Manual is an operating mode. It should not be treated as a fault unless the model-specific product documentation states otherwise.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <div class=\"ly-faq\">\r\n    <h3>Does this compact ATS have a dedicated common alarm?<\/h3>\r\n    <p>\r\n      A dedicated Common Alarm is not visible on the front panel shown here. If a project requires a separate alarm output, confirm that requirement with LEEYEE before ordering.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <div class=\"ly-faq\">\r\n    <h3>Does this compact ATS support Modbus or BMS monitoring?<\/h3>\r\n    <p>\r\n      Do not assume RS485, Modbus, BMS communication or independent remote status outputs are standard. These functions must be confirmed for the specific ATS configuration before project approval.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <section class=\"ly-refs\">\r\n    <h2><span class=\"ez-toc-section\" id=\"references\"><\/span>References<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n    <ol>\r\n      <li id=\"ref-1\">\r\n        IEC, <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\">Official IEC publication<\/a>.\r\n      <\/li>\r\n\r\n      <li id=\"ref-2\">\r\n        Schneider Electric \/ ASCO Power Technologies, <em>Series 300 Automatic Transfer Switch functional-test guidance<\/em>, including separate source-accepted and load-position indications.\r\n        <a href=\"https:\/\/www.se.com\/us\/en\/faqs\/FAQ000238967\/\" target=\"_blank\" rel=\"noopener noreferrer\">Official Schneider Electric FAQ<\/a>.\r\n      <\/li>\r\n\r\n      <li id=\"ref-3\">\r\n        ABB, <em>Automatic Transfer Switch ATS022 \u2014 Installation and Operating Instructions<\/em>, including operating modes, alarms and controller I\/O.\r\n        <a href=\"https:\/\/library.e.abb.com\/public\/3d277efa119e42c488b58f1cf6b1a797\/1SDH000760R0002.pdf\" target=\"_blank\" rel=\"noopener noreferrer\">Official ABB document<\/a>.\r\n      <\/li>\r\n\r\n      <li id=\"ref-4\">\r\n        Eaton, <em>ATS Controllers and Remote Annunciators Design Guide<\/em>, including separate source-availability and source-connected states on applicable controllers.\r\n        <a href=\"https:\/\/www.eaton.com\/content\/dam\/eaton\/products\/design-guides---consultant-audience\/eaton-ats-controller-design-guide-dg140004en.pdf\" target=\"_blank\" rel=\"noopener noreferrer\">Official Eaton design guide<\/a>.\r\n      <\/li>\r\n\r\n      <li id=\"ref-5\">\r\n        LEEYEE, <em>ATS-63 Automatic Transfer Switch Product Page<\/em>.\r\n        <a href=\"https:\/\/www.cnspd.com\/products\/leeyee-automatic-transfer-switch-solar-backup\/\" target=\"_blank\" rel=\"noopener noreferrer\">LEEYEE ATS product information<\/a>.\r\n      <\/li>\r\n    <\/ol>\r\n  <\/section>\r\n\r\n<\/article>\r\n\r\n<script>\r\ndocument.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>\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>Compact ATS Status Indicator GuideCompact automatic transfer switches use a simpler front-panel interface than large ATS controllers. On the LEEYEE compact ATS shown below, the user mainly sees A\/B source identification, AU\/BU indicators, Auto\/Manual control, a load-related indicator and the physical A\/B transfer position. This guide explains how to read these ATS status indicators without&#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-31334","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 Status Indicators Explained for Compact ATS | LEEYEE<\/title>\n<meta name=\"description\" content=\"Learn how to read compact ATS status indicators including A\/B source status, Auto\/Manual mode, Load ON and transfer position, plus what to confirm for alarms, dry contacts, PLC or BMS monitoring.\" \/>\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\/it\/ats-status-indicator-alarm-signal-guide\/\" \/>\n<meta property=\"og:locale\" content=\"it_IT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"ATS Status Indicators Explained for Compact ATS | LEEYEE\" \/>\n<meta property=\"og:description\" content=\"Learn how to read compact ATS status indicators including A\/B source status, Auto\/Manual mode, Load ON and transfer position, plus what to confirm for alarms, dry contacts, PLC or BMS monitoring.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.cnspd.com\/it\/ats-status-indicator-alarm-signal-guide\/\" \/>\n<meta property=\"og:site_name\" content=\"Surge Protector, Surge Arrestor, Isolating Switch - 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