{"id":2811,"date":"2026-02-12T14:54:42","date_gmt":"2026-02-12T14:54:42","guid":{"rendered":"https:\/\/imperix.com\/doc\/?p=2811"},"modified":"2026-02-19T17:37:05","modified_gmt":"2026-02-19T17:37:05","slug":"closed-rack-quick-start-guide","status":"publish","type":"post","link":"https:\/\/imperix.com\/doc\/help\/closed-rack-quick-start-guide","title":{"rendered":"Closed rack &#8211; Quick start guide"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_82_2 ez-toc-wrap-right-text 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\">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=\"https:\/\/imperix.com\/doc\/help\/closed-rack-quick-start-guide\/#What-is-inside-a-closed-rack\" >What is inside a closed rack?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/imperix.com\/doc\/help\/closed-rack-quick-start-guide\/#Auxiliary-power-supply\" >Auxiliary power supply<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/imperix.com\/doc\/help\/closed-rack-quick-start-guide\/#Wiring-the-power-modules\" >Wiring the power modules<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/imperix.com\/doc\/help\/closed-rack-quick-start-guide\/#Type-C-racks\" >Type C racks<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/imperix.com\/doc\/help\/closed-rack-quick-start-guide\/#Type-D-racks\" >Type D racks<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/imperix.com\/doc\/help\/closed-rack-quick-start-guide\/#Status-information-and-fault-signaling\" >Status information and fault signaling<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/imperix.com\/doc\/help\/closed-rack-quick-start-guide\/#Booting-and-normal-operation\" >Booting and normal operation<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/imperix.com\/doc\/help\/closed-rack-quick-start-guide\/#Behavior-under-fault\" >Behavior under fault<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/imperix.com\/doc\/help\/closed-rack-quick-start-guide\/#Going-further-with-the-closed-rack%E2%80%A6\" >Going further with the closed rack&#8230;<\/a><\/li><\/ul><\/nav><\/div>\n\n<p>This document introduces the two variants of the closed rack (types C and D). Intended for first-time users, the guide details the auxiliary power supply requirements, the wiring process, and messages displayed on the LCD screen.<\/p>\n\n\n\n<p>Modules may also be housed within an <a href=\"https:\/\/imperix.com\/doc\/help\/open-rack-quick-start-guide\">open rack<\/a> (type A). This configuration offers greater flexibility, allowing different types of modules to be mixed and easily swapped.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What-is-inside-a-closed-rack\"><\/span>What is inside a closed rack?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>A closed rack is a complete metallic enclosure designed to house six or eight power modules. It consists of:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Six or eight slots<\/strong> equipped with plastic mounting rails to hold power modules<\/li>\n\n\n\n<li>An <strong>LCD screen<\/strong> displaying status information<\/li>\n\n\n\n<li>Integrated enclosure-level variable-speed cooling <strong>fans<\/strong><\/li>\n\n\n\n<li>An <strong>auxiliary power supply<\/strong> for the power modules, screen, and  fans<\/li>\n<\/ul>\n\n\n\n<p>Two types of closed racks exist, which differ by their front-side openings as well as the number of terminals on their rear side.<\/p>\n\n\n<style>.kb-row-layout-id2811_b83bb6-c6 > .kt-row-column-wrap{align-content:start;}:where(.kb-row-layout-id2811_b83bb6-c6 > .kt-row-column-wrap) > .wp-block-kadence-column{justify-content:start;}.kb-row-layout-id2811_b83bb6-c6 > .kt-row-column-wrap{column-gap:var(--global-kb-gap-md, 2rem);row-gap:var(--global-kb-gap-md, 2rem);padding-top:var(--global-kb-spacing-sm, 1.5rem);padding-bottom:var(--global-kb-spacing-sm, 1.5rem);grid-template-columns:repeat(2, minmax(0, 1fr));}.kb-row-layout-id2811_b83bb6-c6 > .kt-row-layout-overlay{opacity:0.30;}@media all and (max-width: 1024px){.kb-row-layout-id2811_b83bb6-c6 > .kt-row-column-wrap{grid-template-columns:repeat(2, minmax(0, 1fr));}}@media all and (max-width: 767px){.kb-row-layout-id2811_b83bb6-c6 > .kt-row-column-wrap{grid-template-columns:minmax(0, 1fr);}}<\/style><div class=\"kb-row-layout-wrap kb-row-layout-id2811_b83bb6-c6 alignnone wp-block-kadence-rowlayout\"><div class=\"kt-row-column-wrap kt-has-2-columns kt-row-layout-equal kt-tab-layout-inherit kt-mobile-layout-row kt-row-valign-top\">\n<style>.kadence-column2811_9ee32f-18 > .kt-inside-inner-col,.kadence-column2811_9ee32f-18 > .kt-inside-inner-col:before{border-top-left-radius:0px;border-top-right-radius:0px;border-bottom-right-radius:0px;border-bottom-left-radius:0px;}.kadence-column2811_9ee32f-18 > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column2811_9ee32f-18 > .kt-inside-inner-col{flex-direction:column;}.kadence-column2811_9ee32f-18 > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column2811_9ee32f-18 > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column2811_9ee32f-18{position:relative;}@media all and (max-width: 1024px){.kadence-column2811_9ee32f-18 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column2811_9ee32f-18 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column kadence-column2811_9ee32f-18\"><div class=\"kt-inside-inner-col\"><div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"380\" height=\"196\" src=\"https:\/\/imperix.com\/doc\/wp-content\/uploads\/2021\/04\/closed_rack_front_overview_type_C.png\" alt=\"Front view of a closed rack type C\" class=\"wp-image-42604\" srcset=\"https:\/\/imperix.com\/doc\/wp-content\/uploads\/2021\/04\/closed_rack_front_overview_type_C.png 380w, https:\/\/imperix.com\/doc\/wp-content\/uploads\/2021\/04\/closed_rack_front_overview_type_C-300x155.png 300w\" sizes=\"auto, (max-width: 380px) 100vw, 380px\" \/><figcaption class=\"wp-element-caption\">Front view &#8211; Type C<\/figcaption><\/figure>\n<\/div><\/div><\/div>\n\n\n<style>.kadence-column2811_f554ac-cb > .kt-inside-inner-col,.kadence-column2811_f554ac-cb > .kt-inside-inner-col:before{border-top-left-radius:0px;border-top-right-radius:0px;border-bottom-right-radius:0px;border-bottom-left-radius:0px;}.kadence-column2811_f554ac-cb > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column2811_f554ac-cb > .kt-inside-inner-col{flex-direction:column;}.kadence-column2811_f554ac-cb > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column2811_f554ac-cb > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column2811_f554ac-cb{position:relative;}@media all and (max-width: 1024px){.kadence-column2811_f554ac-cb > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column2811_f554ac-cb > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column kadence-column2811_f554ac-cb\"><div class=\"kt-inside-inner-col\"><div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"380\" height=\"196\" src=\"https:\/\/imperix.com\/doc\/wp-content\/uploads\/2021\/04\/closed_rack_rear_overview_type_C.png\" alt=\"Rear view of a closed rack type C\" class=\"wp-image-42605\" srcset=\"https:\/\/imperix.com\/doc\/wp-content\/uploads\/2021\/04\/closed_rack_rear_overview_type_C.png 380w, https:\/\/imperix.com\/doc\/wp-content\/uploads\/2021\/04\/closed_rack_rear_overview_type_C-300x155.png 300w\" sizes=\"auto, (max-width: 380px) 100vw, 380px\" \/><figcaption class=\"wp-element-caption\">Rear view &#8211; Type C<\/figcaption><\/figure>\n<\/div><\/div><\/div>\n\n<\/div><\/div>\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-9d6595d7 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"380\" height=\"196\" src=\"https:\/\/imperix.com\/doc\/wp-content\/uploads\/2021\/04\/closed_rack_front_overview_type_D.png\" alt=\"\" class=\"wp-image-42768\" srcset=\"https:\/\/imperix.com\/doc\/wp-content\/uploads\/2021\/04\/closed_rack_front_overview_type_D.png 380w, https:\/\/imperix.com\/doc\/wp-content\/uploads\/2021\/04\/closed_rack_front_overview_type_D-300x155.png 300w\" sizes=\"auto, (max-width: 380px) 100vw, 380px\" \/><figcaption class=\"wp-element-caption\">Front view &#8211; Type D<\/figcaption><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"380\" height=\"196\" src=\"https:\/\/imperix.com\/doc\/wp-content\/uploads\/2021\/04\/closed_rack_rear_overview_type_D.png\" alt=\"Rear view of a closed rack type D\" class=\"wp-image-42610\" srcset=\"https:\/\/imperix.com\/doc\/wp-content\/uploads\/2021\/04\/closed_rack_rear_overview_type_D.png 380w, https:\/\/imperix.com\/doc\/wp-content\/uploads\/2021\/04\/closed_rack_rear_overview_type_D-300x155.png 300w\" sizes=\"auto, (max-width: 380px) 100vw, 380px\" \/><figcaption class=\"wp-element-caption\">Rear view &#8211; Type D<\/figcaption><\/figure>\n<\/div>\n<\/div>\n\n\n\n<p>The compatible products with the Type C racks are listed in the table below.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Module<\/th><th>Topology<\/th><th>Status<\/th><th>Alternative rack<\/th><\/tr><\/thead><tbody><tr><td><a href=\"https:\/\/imperix.com\/datasheets\/PEB-800-40.pdf\">PEB-800-40<\/a><\/td><td>SiC half-bridge<\/td><td>Active<\/td><td>Open rack (type A)<\/td><\/tr><tr><td><a href=\"https:\/\/imperix.com\/wp-content\/uploads\/document\/PEB8024.pdf\">PEB8024<\/a><\/td><td>SiC half-bridge<\/td><td>NRND<\/td><td>Open rack (type A)<\/td><\/tr><tr><td><a href=\"https:\/\/imperix.com\/wp-content\/uploads\/document\/PEB8038.pdf\">PEB8038<\/a><\/td><td>SiC half-bridge<\/td><td>NRND<\/td><td>Open rack (type A)<\/td><\/tr><tr><td><a href=\"https:\/\/imperix.com\/wp-content\/uploads\/document\/PEB4050.pdf\">PEB4050<\/a><\/td><td>IGBT half-bridge<\/td><td>NRND<\/td><td>Open rack (type A)<\/td><\/tr><\/tbody><\/table><figcaption class=\"wp-element-caption\">Compatibility list for the closed rack (type C).<\/figcaption><\/figure>\n\n\n\n<p>Type D racks are however exclusively designed to host PEN modules.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Module<\/th><th>Topology<\/th><th>Status<\/th><th>Alternative rack<\/th><\/tr><\/thead><tbody><tr><td><a href=\"https:\/\/imperix.com\/datasheets\/PEB-800-40.pdf\"><\/a><a href=\"https:\/\/imperix.com\/wp-content\/uploads\/document\/PEN8018.pdf\">PEN8018<\/a><\/td><td>NPC phase-leg<\/td><td>Active<\/td><td>Open rack (type A)<\/td><\/tr><\/tbody><\/table><figcaption class=\"wp-element-caption\">Compatibility list for the closed rack (type D).<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Auxiliary-power-supply\"><\/span>Auxiliary power supply<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>A dual-output power supply energizes the auxiliary circuits for all modules, as illustrated below. The\u00a0+12V output\u00a0is dedicated to the fan and gate drivers, while the\u00a0+5V output\u00a0powers all remaining components. For racks containing eight modules, two additional connectors are included.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"430\" height=\"120\" src=\"https:\/\/imperix.com\/doc\/wp-content\/uploads\/2021\/04\/schematic_power_supply_x6.png\" alt=\"\" class=\"wp-image-40934\" srcset=\"https:\/\/imperix.com\/doc\/wp-content\/uploads\/2021\/04\/schematic_power_supply_x6.png 430w, https:\/\/imperix.com\/doc\/wp-content\/uploads\/2021\/04\/schematic_power_supply_x6-300x84.png 300w\" sizes=\"auto, (max-width: 430px) 100vw, 430px\" \/><\/figure>\n<\/div>\n\n\n<p>Closed racks were originally equipped with a Delta Electronics PMT-D1V100W1AA power supply. In early 2026, this was upgraded to a Mean Well ADS-15512 to accommodate the higher power requirements of the PEB-800-40 modules. The specifications of both models are summarized in the following table:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Specifications<\/th><th>PMT-D1V100W1AA<\/th><th>ADS-15512<\/th><\/tr><\/thead><tbody><tr><td>Output voltage (CH1)<\/td><td>+12 V<\/td><td>+12 V<\/td><\/tr><tr><td>Rated current (CH1)<\/td><td>7 A<\/td><td>11.5 A<\/td><\/tr><tr><td>Output voltage (CH2)<\/td><td>+5 V<\/td><td>+5 V<\/td><\/tr><tr><td>Rated current (CH2)<\/td><td>3 A<\/td><td>3 A<\/td><\/tr><tr><td>Rated power<\/td><td>100 W<\/td><td>153 W<\/td><\/tr><tr><td>Input voltage range<\/td><td>100 ~ 120 V<sub>AC<\/sub> or 200 ~ 240 V<sub>AC<\/sub><\/td><td>100 ~ 240 V<sub>AC<\/sub><\/td><\/tr><tr><td>Input frequency range<\/td><td>47 ~ 63 Hz<\/td><td>47 ~ 63 Hz<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<div class=\"wp-block-simple-alerts-for-gutenberg-alert-boxes sab-alert sab-alert-warning\" role=\"alert\">The PMT-D1V100W1AA power supply&#8217;s input voltage range is pre-configured by imperix via a voltage selector based on the destination country. Adherence to the input voltage range specified on the nameplate is mandatory.<\/div>\n\n\n\n<p>The AC inlet includes two 2A \/ 250V ceramic fuses (<a href=\"https:\/\/www.belfuse.com\/products\/circuit-protection\/fuses\/5ht-2-r\">Bel 5HT 2-R<\/a>) in a tray, as shown below. The left fuse is connected in series with the AC input to protect the auxiliary power supply, while the right fuse is a spare unit.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"380\" height=\"298\" src=\"https:\/\/imperix.com\/doc\/wp-content\/uploads\/2021\/04\/replacing_fuse_closed_rack.png\" alt=\"Fuse compartment location\" class=\"wp-image-42335\" srcset=\"https:\/\/imperix.com\/doc\/wp-content\/uploads\/2021\/04\/replacing_fuse_closed_rack.png 380w, https:\/\/imperix.com\/doc\/wp-content\/uploads\/2021\/04\/replacing_fuse_closed_rack-300x235.png 300w\" sizes=\"auto, (max-width: 380px) 100vw, 380px\" \/><\/figure>\n<\/div>\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Wiring-the-power-modules\"><\/span>Wiring the power modules<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<div class=\"wp-block-simple-alerts-for-gutenberg-alert-boxes sab-alert sab-alert-warning\" role=\"alert\">Ensure all modules are powered off, and DC capacitors are fully discharged before wiring. Furthermore, the maximum continuous current supported by banana plugs is <strong>32 A<\/strong>.<\/div>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Type-C-racks\"><\/span>Type C racks<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Wiring is required on both the power and control sides. For that, the following connections are provided:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The switching node (AC)<\/li>\n\n\n\n<li>The positive (DC+) and negative (DC-) DC bus terminals<\/li>\n\n\n\n<li>Two analog outputs for the on-board sensors I<sub>AC<\/sub>\u00a0and V<sub>DC<\/sub>\u00a0(RJ-45 sockets)<\/li>\n\n\n\n<li>Two optical inputs for the high (H) and low (L) PWM gating signals<\/li>\n\n\n\n<li>An optical fault output<\/li>\n<\/ul>\n\n\n\n<p>The integrated sensors do not utilize the Ethernet protocol for data transmission; rather, RJ-45 cables are capable of conveying analog signals due to their shielding and twisted-pair construction. A dedicated \u00b115V external supply is required for each onboard sensor, delivered through the RJ-45 cable. B-Box controllers provide this voltage. However, third-party controllers may necessitate an independent power source.<\/p>\n\n\n\n<p>Gating signals are sent through standard 650 nm Plastic Optical Fibers (POF) or Plastic Clad Silica (PCS) fibers. No special coding is required: light \u2018ON\u2019 applies a positive voltage on the gate; light \u2018OFF\u2019 applies a negative one. Similarly, the optical fault output is in the light \u2018OFF\u2019 state to indicate a fault condition. This signal can be retrieved by B-Box controllers using an\u00a0<a href=\"https:\/\/imperix.com\/products\/control\/accessories\/#optical_expansion_board\">optical expansion board<\/a>.<\/p>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-9d6595d7 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"380\" height=\"150\" src=\"https:\/\/imperix.com\/doc\/wp-content\/uploads\/2021\/04\/closed_rack_front_connectivity_type_C-1.png\" alt=\"Front connectivity for a closed rack type C\" class=\"wp-image-42622\" srcset=\"https:\/\/imperix.com\/doc\/wp-content\/uploads\/2021\/04\/closed_rack_front_connectivity_type_C-1.png 380w, https:\/\/imperix.com\/doc\/wp-content\/uploads\/2021\/04\/closed_rack_front_connectivity_type_C-1-300x118.png 300w\" sizes=\"auto, (max-width: 380px) 100vw, 380px\" \/><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"380\" height=\"150\" src=\"https:\/\/imperix.com\/doc\/wp-content\/uploads\/2021\/04\/closed_rack_rear_connectivity_type_C.png\" alt=\"Rear connectivity for a closed rack type C\" class=\"wp-image-42595\" srcset=\"https:\/\/imperix.com\/doc\/wp-content\/uploads\/2021\/04\/closed_rack_rear_connectivity_type_C.png 380w, https:\/\/imperix.com\/doc\/wp-content\/uploads\/2021\/04\/closed_rack_rear_connectivity_type_C-300x118.png 300w\" sizes=\"auto, (max-width: 380px) 100vw, 380px\" \/><\/figure>\n<\/div>\n<\/div>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Type-D-racks\"><\/span>Type D racks<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Type D racks provide a slightly different connectivity:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The DC-bus midpoint terminal is also available (N).<\/li>\n\n\n\n<li>Four optical inputs for the PWM gating signals are available instead of two.<\/li>\n<\/ul>\n\n\n\n<p>PEN modules use a single RJ45 connector to output the voltage of either the upper or lower DC half-bus, selectable via an internal jumper. Because this jumper cannot be accessed once installed in a closed rack, the modules are configured alternately from the leftmost slot to the rightmost slot, starting with the upper voltage. Further details on this jumper configuration can be found in the guide about <a href=\"https:\/\/imperix.com\/doc\/help\/open-rack-quick-start-guide#insert-pen\" type=\"link\" id=\"https:\/\/imperix.com\/doc\/help\/open-rack-quick-start-guide#insert-pen\">open racks<\/a>.<\/p>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-9d6595d7 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"380\" height=\"150\" src=\"https:\/\/imperix.com\/doc\/wp-content\/uploads\/2021\/04\/closed_rack_front_connectivity_type_D.png\" alt=\"Front connectivity for a closed rack type D\" class=\"wp-image-42596\" srcset=\"https:\/\/imperix.com\/doc\/wp-content\/uploads\/2021\/04\/closed_rack_front_connectivity_type_D.png 380w, https:\/\/imperix.com\/doc\/wp-content\/uploads\/2021\/04\/closed_rack_front_connectivity_type_D-300x118.png 300w\" sizes=\"auto, (max-width: 380px) 100vw, 380px\" \/><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"380\" height=\"150\" src=\"https:\/\/imperix.com\/doc\/wp-content\/uploads\/2021\/04\/closed_rack_rear_connectivity_type_D.png\" alt=\"Rear connectivity for a closed rack type D\" class=\"wp-image-42597\" srcset=\"https:\/\/imperix.com\/doc\/wp-content\/uploads\/2021\/04\/closed_rack_rear_connectivity_type_D.png 380w, https:\/\/imperix.com\/doc\/wp-content\/uploads\/2021\/04\/closed_rack_rear_connectivity_type_D-300x118.png 300w\" sizes=\"auto, (max-width: 380px) 100vw, 380px\" \/><\/figure>\n<\/div>\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Status-information-and-fault-signaling\"><\/span>Status information and fault signaling<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Modules are internally interconnected in a daisy-chain configuration via ribbon cables to enable global fault propagation and centralized fault clearance. This communication bus also transmits real-time status information to the LCD screen, informing the user about fan speeds, temperatures, and fault flags.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Booting-and-normal-operation\"><\/span>Booting and normal operation<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>When a closed rack is turned on, the LCD displays a booting message for 1 second:<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"72\" src=\"https:\/\/imperix.com\/doc\/wp-content\/uploads\/2021\/04\/image-224.png\" alt=\"LCD display booting message\" class=\"wp-image-2813\" title=\"Product notes &gt; PN157: Closed rack LCD display &gt; LCD_boot.png\"\/><\/figure>\n<\/div>\n\n\n<p>After the boot, the screen displays the following information:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The temperature inside the rack [\u00b0C]<\/li>\n\n\n\n<li>The highest fan speed of the three enclosure fans [rpm]<\/li>\n\n\n\n<li>The highest temperature among all the power modules [\u00b0C]<\/li>\n\n\n\n<li>The highest fan speed of all the power modules&nbsp;[rpm]<\/li>\n<\/ul>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"72\" src=\"https:\/\/imperix.com\/doc\/wp-content\/uploads\/2021\/04\/image-225.png\" alt=\"LCD display showing temperature and fan speed\" class=\"wp-image-2814\" title=\"Product notes &gt; PN157: Closed rack LCD display &gt; LCD_main.png\"\/><\/figure>\n<\/div>\n\n\n<p>As long as there are no faults, the screen is refreshed every second.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Behavior-under-fault\"><\/span>Behavior under fault<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Each module can generate any of the following local faults, immediately blocking the gating signals:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th><strong>Flag<\/strong><\/th><th><strong>Description<\/strong><\/th><\/tr><\/thead><tbody><tr><td>V.<\/td><td>Over-voltage detected on the DC bus, or DC bus imbalance<\/td><\/tr><tr><td>I.<\/td><td>Over-current detected at the switching node (AC)<\/td><\/tr><tr><td>D.<\/td><td>Excessive drain-source voltage during on-state (PEB only), or 1-1 condition on the PWM signals<\/td><\/tr><tr><td>P.<\/td><td>Inadequate power supply voltage<\/td><\/tr><tr><td>T.F<\/td><td>Over-temperature on the cooler, or probable fan fault (no tachometer signal)<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>Detailed fault diagnostics are available on the LCD screen, and error messages will cycle continuously until the fault condition is resolved:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>A first message indicating the source of the fault. The possible sources are:\n<ul class=\"wp-block-list\">\n<li>&#8220;POWER MODULE FAULT&#8221; if the fault comes from one of the modules,<\/li>\n\n\n\n<li>&#8220;RACK COOLING ERROR&#8221; if there is an issue with the enclosure fans or internal temperature probes.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-9d6595d7 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\"><div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"72\" src=\"https:\/\/imperix.com\/doc\/wp-content\/uploads\/2021\/04\/image-226.png\" alt=\"Fault message when a power module generated the fault\" class=\"wp-image-2815\" title=\"Product notes &gt; PN157: Closed rack LCD display &gt; LCD_power_flt.png\"\/><\/figure>\n<\/div><\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\"><div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"72\" src=\"https:\/\/imperix.com\/doc\/wp-content\/uploads\/2021\/04\/image-227.png\" alt=\"Fault message when a rack cooling error occurs\" class=\"wp-image-2816\" title=\"Product notes &gt; PN157: Closed rack LCD display &gt; LCD_rack_error.png\"\/><\/figure>\n<\/div><\/div>\n<\/div>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Subsequently, the system displays a sequence of six or eight status messages (one per module) to identify local faults. If a fault is detected, the specific error type is reported. If the module is functioning correctly, the display provides real-time operating temperature and fan speed metrics.<\/li>\n<\/ul>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-9d6595d7 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\"><div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"72\" src=\"https:\/\/cdn.imperix.com\/doc\/wp-content\/uploads\/2021\/04\/image-228.png\" alt=\"Typical error message when a fault occurred on a power module.\" class=\"wp-image-2817\" title=\"Product notes &gt; PN157: Closed rack LCD display &gt; LCD_module_notok.png\"\/><figcaption class=\"wp-element-caption\">Example of an overcurrent fault on the module 2<\/figcaption><\/figure>\n<\/div><\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\"><div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"72\" src=\"https:\/\/imperix.com\/doc\/wp-content\/uploads\/2021\/04\/image-229.png\" alt=\"Module status message during normal operation\" class=\"wp-image-2818\" title=\"Product notes &gt; PN157: Closed rack LCD display &gt; LCD_mod_ok.png\"\/><figcaption class=\"wp-element-caption\">Example of a module without a fault<\/figcaption><\/figure>\n<\/div><\/div>\n<\/div>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The last message displays the highest temperatures and fan speeds, as during normal operation:<\/li>\n<\/ul>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"72\" src=\"https:\/\/cdn.imperix.com\/doc\/wp-content\/uploads\/2021\/04\/image-225.png\" alt=\"Screen showing temperature and fan speed\" class=\"wp-image-2814\" title=\"Product notes &gt; PN157: Closed rack LCD display &gt; LCD_main.png\"\/><\/figure>\n<\/div>\n\n\n<p>The modules&#8217; logic generates a fault flag, which is made available via an optical output (see below) and propagated to the other modules. The fault can be cleared by pressing the dedicated button located below the screen. Clearance is only successful if the underlying fault condition is no longer present.<\/p>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-9d6595d7 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"380\" height=\"196\" src=\"https:\/\/imperix.com\/doc\/wp-content\/uploads\/2021\/04\/closed_rack_fault_clear_type_C.png\" alt=\"Location of the clear button and fault outputs on a closed rack type C\" class=\"wp-image-42583\" srcset=\"https:\/\/imperix.com\/doc\/wp-content\/uploads\/2021\/04\/closed_rack_fault_clear_type_C.png 380w, https:\/\/imperix.com\/doc\/wp-content\/uploads\/2021\/04\/closed_rack_fault_clear_type_C-300x155.png 300w\" sizes=\"auto, (max-width: 380px) 100vw, 380px\" \/><figcaption class=\"wp-element-caption\">Location of the fault outputs and the clear button &#8211; Type C<\/figcaption><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"380\" height=\"196\" src=\"https:\/\/imperix.com\/doc\/wp-content\/uploads\/2021\/04\/closed_rack_fault_clear_type_D.png\" alt=\"Location of the clear button and fault outputs on a closed rack type D\" class=\"wp-image-42584\" srcset=\"https:\/\/imperix.com\/doc\/wp-content\/uploads\/2021\/04\/closed_rack_fault_clear_type_D.png 380w, https:\/\/imperix.com\/doc\/wp-content\/uploads\/2021\/04\/closed_rack_fault_clear_type_D-300x155.png 300w\" sizes=\"auto, (max-width: 380px) 100vw, 380px\" \/><figcaption class=\"wp-element-caption\">Location of the fault outputs and the clear button &#8211; Type D<\/figcaption><\/figure>\n<\/div>\n<\/div>\n\n\n\n<div class=\"wp-block-simple-alerts-for-gutenberg-alert-boxes sab-alert sab-alert-info\" role=\"alert\">Severe Electromagnetic Interference (EMI) may trigger a false global fault. In such a case, the LCD would display a &#8220;POWER MODULE FAULT&#8221; despite all modules reporting an &#8220;OK&#8221; status. To prevent these false triggers, appropriate EMI mitigation techniques must be implemented.<\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Going-further-with-the-closed-rack%E2%80%A6\"><\/span>Going further with the closed rack&#8230;<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>A fully functional converter requires a controller, such as the <a href=\"https:\/\/imperix.com\/products\/control\/rcp-controller\/\">B-Box 4<\/a>, in addition to power modules. The following articles provide guidance to build a complete converter within a closed rack.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/imperix.com\/doc\/help\/b-box-4-quick-start-guide\">B-Box 4 &#8211; Quick start guide (PN254)<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/imperix.com\/doc\/help\/peb-800-40\">PEB-800-40 &#8211; Quick start guide (PN210)<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/imperix.com\/doc\/help\/how-to-build-a-3-phase-inverter?currentThread=power-electronic-bundle\">How to build a three-phase converter (PN170)<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/imperix.com\/doc\/implementation\/neutral-point-clamped-inverter?currentThread=fast-electric-vehicle-charger-with-intermediate-energy-storage\">Neutral Point Clamped Inverter (NPC) (TN135)<\/a><\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>This document introduces the two variants of the closed rack (types C and D). Intended for first-time users, the guide details the auxiliary power supply&#8230;<\/p>\n","protected":false},"author":8,"featured_media":3026,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_kad_post_transparent":"","_kad_post_title":"","_kad_post_layout":"","_kad_post_sidebar_id":"","_kad_post_content_style":"","_kad_post_vertical_padding":"","_kad_post_feature":"","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false,"_kad_post_classname":"","footnotes":""},"categories":[3],"tags":[],"software-environments":[],"provided-results":[],"related-products":[112,111],"guidedreadings":[],"tutorials":[],"user-manuals":[145,144],"coauthors":[62],"class_list":["post-2811","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-help","related-products-peb","related-products-pm","user-manuals-power-electronic-bundle","user-manuals-power-modules"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Closed rack - Quick start guide - imperix<\/title>\n<meta name=\"description\" content=\"This quick start guide explains how to use a closed rack type C and D. 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