{"id":1057,"date":"2026-02-12T14:54:26","date_gmt":"2026-02-12T14:54:26","guid":{"rendered":"https:\/\/imperix.com\/doc\/?p=1057"},"modified":"2026-02-19T17:01:58","modified_gmt":"2026-02-19T17:01:58","slug":"open-rack-quick-start-guide","status":"publish","type":"post","link":"https:\/\/imperix.com\/doc\/help\/open-rack-quick-start-guide","title":{"rendered":"Open 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\/open-rack-quick-start-guide\/#What-is-inside-an-open-rack\" >What is inside an open 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\/open-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\/open-rack-quick-start-guide\/#Inserting-power-modules-into-an-open-rack\" >Inserting power modules into an open rack<\/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\/open-rack-quick-start-guide\/#PEB-modules\" >PEB modules<\/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\/open-rack-quick-start-guide\/#PEN-modules\" >PEN modules<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/imperix.com\/doc\/help\/open-rack-quick-start-guide\/#PEH-modules\" >PEH modules<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/imperix.com\/doc\/help\/open-rack-quick-start-guide\/#Fault-signaling\" >Fault signaling<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/imperix.com\/doc\/help\/open-rack-quick-start-guide\/#Fault-sharing\" >Fault sharing<\/a><\/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\/open-rack-quick-start-guide\/#Going-further-with-the-open-rack%E2%80%A6\" >Going further with the open rack&#8230;<\/a><\/li><\/ul><\/nav><\/div>\n\n<p>This document provides guidance for integrating imperix power modules into an open rack (type A). Intended for first-time users, the guide details essential mechanical considerations, auxiliary power supply requirements, and fault signaling configurations necessary for a successful installation.<\/p>\n\n\n\n<p>Modules may also be housed in a <a href=\"https:\/\/imperix.com\/doc\/help\/closed-rack-quick-start-guide\">closed rack<\/a> (Type C or D), offering enhanced safety and facilitating tool-free manupulation thanks to banana connectors.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What-is-inside-an-open-rack\"><\/span>What is inside an open rack?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>An open rack is a metallic frame that can hold up to eight imperix power modules. It consists of:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Eight sets of plastic <strong>mounting rails<\/strong> to slide power modules into.<\/li>\n\n\n\n<li>An <strong>auxiliary power supply<\/strong> that delivers +12V\/5V to the modules.<\/li>\n<\/ul>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"400\" height=\"222\" src=\"https:\/\/imperix.com\/doc\/wp-content\/uploads\/2025\/12\/open_rack.png\" alt=\"Open rack hosting 3 power modules\" class=\"wp-image-39031\" srcset=\"https:\/\/imperix.com\/doc\/wp-content\/uploads\/2025\/12\/open_rack.png 400w, https:\/\/imperix.com\/doc\/wp-content\/uploads\/2025\/12\/open_rack-300x167.png 300w\" sizes=\"auto, (max-width: 400px) 100vw, 400px\" \/><\/figure>\n<\/div>\n\n\n<p>Each slot is fully independent, though all share a common auxiliary power supply. Consequently, users may populate any slot and combine different types of power modules as required. Compatible Imperix products 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>Closed rack (type C)<\/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>Closed rack (type C)<\/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>Closed rack (type C)<\/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>Closed rack (type C)<\/td><\/tr><tr><td><a href=\"https:\/\/imperix.com\/wp-content\/uploads\/document\/PEN8018.pdf\">PEN8018<\/a><\/td><td>NPC phase-leg<\/td><td>Active<\/td><td>Closed rack (type C)<\/td><\/tr><tr><td><a href=\"https:\/\/imperix.com\/wp-content\/uploads\/document\/PEH2015.pdf\">PEH2015<\/a><\/td><td>Full-bridge<\/td><td>Active<\/td><td>n\/a<\/td><\/tr><tr><td><a href=\"https:\/\/imperix.com\/wp-content\/uploads\/document\/PEH4010.pdf\">PEH4010<\/a><\/td><td>Full-bridge<\/td><td>Active<\/td><td>n\/a<\/td><\/tr><\/tbody><\/table><\/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>Each of the eight modules utilizes a dual-output power supply for its auxiliary circuitry. The&nbsp;+12V output&nbsp;is dedicated to the fan and gate drivers, while the&nbsp;+5V output&nbsp;powers all remaining components.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"500\" height=\"120\" src=\"https:\/\/imperix.com\/doc\/wp-content\/uploads\/2021\/03\/schematic_power_supply.png\" alt=\"Auxiliary power supply schematic.\" class=\"wp-image-40920\" srcset=\"https:\/\/imperix.com\/doc\/wp-content\/uploads\/2021\/03\/schematic_power_supply.png 500w, https:\/\/imperix.com\/doc\/wp-content\/uploads\/2021\/03\/schematic_power_supply-300x72.png 300w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/figure>\n<\/div>\n\n\n<p>The open rack utilizes a Delta Electronics PMT-D1V100W1AA power supply. This unit features a manual 115\/230 VAC selector switch that must be configured to match the local grid voltage prior to operation.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"450\" height=\"220\" src=\"https:\/\/imperix.com\/doc\/wp-content\/uploads\/2021\/03\/old_power_supply.png\" alt=\"Identifying old PMT-D1V100W1AA power supplies based on their 115\/230 VAC voltage selector.\" class=\"wp-image-42337\" srcset=\"https:\/\/imperix.com\/doc\/wp-content\/uploads\/2021\/03\/old_power_supply.png 450w, https:\/\/imperix.com\/doc\/wp-content\/uploads\/2021\/03\/old_power_supply-300x147.png 300w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><figcaption class=\"wp-element-caption\">Location of the voltage selector on the PMT-D1V100W1AA power supply.<\/figcaption><\/figure>\n<\/div>\n\n\n<div class=\"wp-block-simple-alerts-for-gutenberg-alert-boxes sab-alert sab-alert-warning\" role=\"alert\">Improper selection of the input voltage range may result in permanent damage to the power supply. Consequently, it is recommended to <strong>verify the position of the voltage selector switch<\/strong>, if present, before the initial activation of the rack.<\/div>\n\n\n\n<p>In early 2026, the power supply was upgraded to the Mean Well ADS-15512 to support the increased power demands of PEB-800-40 modules. Unlike the previous model, this unit features a universal input range compatible with 115\/230 VAC and does not require a manual selector switch.<\/p>\n\n\n\n<p>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<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Inserting-power-modules-into-an-open-rack\"><\/span>Inserting power modules into an open rack<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\">All modules must be <strong>powered off<\/strong> and DC capacitors <strong>fully discharged<\/strong> before beginning the installation. Additionally, the auxiliary power supply must be disconnected from the AC mains, as input phase voltages are exposed and pose an electrical hazard.<\/div>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"insert-peb\"><span class=\"ez-toc-section\" id=\"PEB-modules\"><\/span>PEB modules<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>All PEB modules share the same connectivity, as presented in the <a href=\"https:\/\/imperix.com\/doc\/help\/peb-800-40?_thumbnail_id=39105\">PEB-800-40 quick start guide<\/a>:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The switching node (AC)<\/li>\n\n\n\n<li>The DC bus positive (DC+), negative (DC-), and mid-point (N) terminals<\/li>\n\n\n\n<li>Two analog outputs for the on-board sensors I<sub>AC<\/sub>&nbsp;and V<sub>DC<\/sub>&nbsp;(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. Instead, 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. <\/p>\n\n\n\n<p>Due to restricted access following installation, the AC and N terminals must be wired prior to mounting the module inside the rack. Connections should be secured using an M4 screw. Using an anti-loosening washer, and a suitable ring terminal (e.g., RND 465-00635) is recommended.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"668\" height=\"283\" src=\"https:\/\/imperix.com\/doc\/wp-content\/uploads\/2025\/12\/peb-connectivity-4.png\" alt=\"Connectivity for imperix PEB modules.\" class=\"wp-image-39074\" style=\"object-fit:cover\" srcset=\"https:\/\/imperix.com\/doc\/wp-content\/uploads\/2025\/12\/peb-connectivity-4.png 668w, https:\/\/imperix.com\/doc\/wp-content\/uploads\/2025\/12\/peb-connectivity-4-300x127.png 300w\" sizes=\"auto, (max-width: 668px) 100vw, 668px\" \/><\/figure>\n<\/div>\n\n\n<p>The next step is to slide the module into the rails and connect the auxiliary power supply, as shown below. The connector is keyed to ensure correct orientation and prevent the reversal of the +12V and +5V supplies.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"450\" height=\"280\" src=\"https:\/\/imperix.com\/doc\/wp-content\/uploads\/2021\/03\/open_rack_connect_auxiliary_power_to_peb.png\" alt=\"Location of the auxiliary power connector for supplying a module in an open rack type A.\" class=\"wp-image-42318\" style=\"width:450px\" srcset=\"https:\/\/imperix.com\/doc\/wp-content\/uploads\/2021\/03\/open_rack_connect_auxiliary_power_to_peb.png 450w, https:\/\/imperix.com\/doc\/wp-content\/uploads\/2021\/03\/open_rack_connect_auxiliary_power_to_peb-300x187.png 300w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/figure>\n<\/div>\n\n\n<p>In case fault-related information must be shared accross the modules, flat ribbon cables (TE connectivity <a href=\"https:\/\/www.te.com\/en\/product-2205065-2.html\">2205065-2<\/a>) can be used in a daisy-chain configuration. More information is given in the <a href=\"#fault_sharing\" type=\"internal\" id=\"#fault-signaling\">Fault signalling<\/a> section below.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"450\" height=\"317\" src=\"https:\/\/imperix.com\/doc\/wp-content\/uploads\/2025\/12\/flat_cable_location.png\" alt=\"Flat cable location in an open rack type A\" class=\"wp-image-39428\" srcset=\"https:\/\/imperix.com\/doc\/wp-content\/uploads\/2025\/12\/flat_cable_location.png 450w, https:\/\/imperix.com\/doc\/wp-content\/uploads\/2025\/12\/flat_cable_location-300x211.png 300w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/figure>\n<\/div>\n\n\n<p>Finally, the DC bus terminals can be wired using either ring terminals or bus bars (sold separately).<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"450\" height=\"256\" src=\"https:\/\/imperix.com\/doc\/wp-content\/uploads\/2021\/03\/busbar_open_rack-2.png\" alt=\"Wiring the DC bus either with bus bars or individual wires.\" class=\"wp-image-42332\" style=\"object-fit:cover\" srcset=\"https:\/\/imperix.com\/doc\/wp-content\/uploads\/2021\/03\/busbar_open_rack-2.png 450w, https:\/\/imperix.com\/doc\/wp-content\/uploads\/2021\/03\/busbar_open_rack-2-300x171.png 300w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/figure>\n<\/div>\n\n\n<h3 class=\"wp-block-heading\" id=\"insert-pen\"><span class=\"ez-toc-section\" id=\"PEN-modules\"><\/span>PEN modules<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>The installation of PEN modules follows the same procedure as for <a href=\"#insert-peb\">PEB modules<\/a>, except for the onboard voltage sensor configuration. PEN modules use two sensors to monitor either the upper or lower DC half-bus, depending on the position of two jumpers. As these jumpers are difficult to access once installed, the desired measurement output must be configured before sliding the module into the rack.<\/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=\"293\" src=\"https:\/\/imperix.com\/doc\/wp-content\/uploads\/2021\/03\/schematic_voltage_selector_PEN.png\" alt=\"Schematic of a PEN module showing the two voltage sensors.\" class=\"wp-image-41559\" srcset=\"https:\/\/imperix.com\/doc\/wp-content\/uploads\/2021\/03\/schematic_voltage_selector_PEN.png 380w, https:\/\/imperix.com\/doc\/wp-content\/uploads\/2021\/03\/schematic_voltage_selector_PEN-300x231.png 300w\" sizes=\"auto, (max-width: 380px) 100vw, 380px\" \/><figcaption class=\"wp-element-caption\">Each PEN module can output either the upper or lower DC half-bus measurement.<\/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\" style=\"margin-top:0;margin-bottom:0\"><img loading=\"lazy\" decoding=\"async\" width=\"380\" height=\"293\" src=\"https:\/\/imperix.com\/doc\/wp-content\/uploads\/2021\/03\/PEN_jumper_MG_8460-1.png\" alt=\"Position of the voltage measurement selector on a PEN module. \" class=\"wp-image-42809\" srcset=\"https:\/\/imperix.com\/doc\/wp-content\/uploads\/2021\/03\/PEN_jumper_MG_8460-1.png 380w, https:\/\/imperix.com\/doc\/wp-content\/uploads\/2021\/03\/PEN_jumper_MG_8460-1-300x231.png 300w\" sizes=\"auto, (max-width: 380px) 100vw, 380px\" \/><figcaption class=\"wp-element-caption\">The two jumpers are located next to the mezzanine board.<\/figcaption><\/figure>\n<\/div>\n<\/div>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"447\" src=\"https:\/\/imperix.com\/doc\/wp-content\/uploads\/2021\/04\/PEN8018.jpg\" alt=\"Experimental setup with three PEN8018 power modules in an open rack type A.\" class=\"wp-image-2973\" style=\"width:400px\" srcset=\"https:\/\/imperix.com\/doc\/wp-content\/uploads\/2021\/04\/PEN8018.jpg 800w, https:\/\/imperix.com\/doc\/wp-content\/uploads\/2021\/04\/PEN8018-300x168.jpg 300w, https:\/\/imperix.com\/doc\/wp-content\/uploads\/2021\/04\/PEN8018-768x429.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><figcaption class=\"wp-element-caption\">PEN modules in an open rack (type A).<\/figcaption><\/figure>\n<\/div>\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"PEH-modules\"><\/span>PEH modules<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>In contrast to <a href=\"#insert-peb\">PEB<\/a> and <a href=\"#insert-pen\">PEN<\/a> modules, PEH power terminals are mounted on the top side. Also, fault sharing using the flat cables is not available. The installation is therefore simplified as follows:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Slide PEH modules into the rack.<\/li>\n\n\n\n<li>Connect the auxiliary power supply (+12V\/+5V).<\/li>\n\n\n\n<li>Wire the power stage using M4 <strong>fork<\/strong> terminals (e.g., Phoenix Contact <a href=\"https:\/\/www.phoenixcontact.com\/en-ch\/products\/fork-type-cable-lug-c-fci-6-m4-3240042\">3240042<\/a>).<\/li>\n<\/ol>\n\n\n<div class=\"wp-block-image is-resized\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"720\" height=\"240\" src=\"https:\/\/imperix.com\/doc\/wp-content\/uploads\/2021\/03\/peh_installed_in_open_rack_top_view-1.png\" alt=\"\" class=\"wp-image-42356\" srcset=\"https:\/\/imperix.com\/doc\/wp-content\/uploads\/2021\/03\/peh_installed_in_open_rack_top_view-1.png 720w, https:\/\/imperix.com\/doc\/wp-content\/uploads\/2021\/03\/peh_installed_in_open_rack_top_view-1-300x100.png 300w\" sizes=\"auto, (max-width: 720px) 100vw, 720px\" \/><\/figure>\n<\/div>\n\n\n<h2 class=\"wp-block-heading\" id=\"fault-signaling\"><span class=\"ez-toc-section\" id=\"Fault-signaling\"><\/span>Fault signaling<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Six red LEDs located on the front side of the module (under the mezzanine board) indicate the origin of the fault, when applicable. The corresponding flags categorize the possible causes, as indicated in the table below.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th><br><strong>Flag<\/strong><\/th><th><strong>Description<\/strong><\/th><\/tr><\/thead><tbody><tr><td>VOLT<\/td><td>Over-voltage detected on the DC bus, or DC bus imbalance<\/td><\/tr><tr><td>CURR<\/td><td>Over-current detected at the switching node (AC)<\/td><\/tr><tr><td>DESAT<\/td><td>Excessive drain-source voltage during on-state (PEB only), or 1-1 condition on the PWM signals<\/td><\/tr><tr><td>P.SUP.<\/td><td>Inadequate power supply voltage<\/td><\/tr><tr><td>COOL<\/td><td>Over-temperature on the cooler, or probable fan fault (no tachometer signal)<\/td><\/tr><tr><td>RMT<\/td><td>Remote fault flag active (triggered remotely or locally)<\/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\">Protection thresholds are fixed at the maximum ratings for each module type, as detailed in their respective datasheets. Because these non-configurable limits can be quite high, it is <strong>preferable to always configure <a href=\"https:\/\/imperix.com\/doc\/help\/over-current-and-over-voltage-protection\" type=\"link\" id=\"https:\/\/imperix.com\/doc\/help\/over-current-and-over-voltage-protection\">over-current and over-voltage protections<\/a> from the B-Box controller<\/strong>, which can implement faster and user-configurable safety limits.<\/div>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"340\" height=\"183\" src=\"https:\/\/imperix.com\/doc\/wp-content\/uploads\/2025\/12\/peb-led-indicators-1.png\" alt=\"Locating fault LED indicators\" class=\"wp-image-39101\" srcset=\"https:\/\/imperix.com\/doc\/wp-content\/uploads\/2025\/12\/peb-led-indicators-1.png 340w, https:\/\/imperix.com\/doc\/wp-content\/uploads\/2025\/12\/peb-led-indicators-1-300x161.png 300w\" sizes=\"auto, (max-width: 340px) 100vw, 340px\" \/><\/figure>\n<\/div>\n\n\n<p>When a fault occurs, the system remains in a fault state until manually cleared or the whole rack is power-cycled. The fault can be cleared by pressing the dedicated button located on the mezzanine. 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\/2025\/12\/peb-fault-clear-location-mezzanine-2.png\" alt=\"\" class=\"wp-image-39098\" srcset=\"https:\/\/imperix.com\/doc\/wp-content\/uploads\/2025\/12\/peb-fault-clear-location-mezzanine-2.png 380w, https:\/\/imperix.com\/doc\/wp-content\/uploads\/2025\/12\/peb-fault-clear-location-mezzanine-2-300x155.png 300w\" sizes=\"auto, (max-width: 380px) 100vw, 380px\" \/><figcaption class=\"wp-element-caption\">Fault output indicator and clear button location on PEB and PEN modules.<\/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\/03\/peb-fault-clear-location-mezza-v1.png\" alt=\"\" class=\"wp-image-41561\" srcset=\"https:\/\/imperix.com\/doc\/wp-content\/uploads\/2021\/03\/peb-fault-clear-location-mezza-v1.png 380w, https:\/\/imperix.com\/doc\/wp-content\/uploads\/2021\/03\/peb-fault-clear-location-mezza-v1-300x155.png 300w\" sizes=\"auto, (max-width: 380px) 100vw, 380px\" \/><figcaption class=\"wp-element-caption\">Fault output indicator and clear button location on PEH modules.<\/figcaption><\/figure>\n<\/div>\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"fault_sharing\"><span class=\"ez-toc-section\" id=\"Fault-sharing\"><\/span>Fault sharing<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>The onboard logic generates a global fault flag, which can be fed back to the controller (if needed) via the optical output (see images above). This signal is inverted so that the absence of light signals a fault. When using B-Box controllers, this signal can be retrieved using an&nbsp;<a href=\"https:\/\/imperix.com\/products\/control\/accessories\/#optical_expansion_board\">optical expansion board<\/a>.<\/p>\n\n\n\n<p>Faults can also be shared across PEB or PEN modules using daisy-chained flat cables (see assembly instructions above). This mechanism ensures that the global fault flag and clear signal propagate across all modules. <\/p>\n\n\n\n<p>Coordinated tripping may be useful for faults that cannot be seen by the controller, such as cooling, desaturation, and power supply faults. However, for over-current or over-voltage faults, it is preferable not to rely on module-to-module fault sharing for the following reasons:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The protections inside imperix controllers can be set to lower thresholds and offer faster response times.<\/li>\n\n\n\n<li>If an over-limit condition is detected by an imperix controller, the PWM signals are blocked even before the fault-sharing information is carried to all modules.<\/li>\n\n\n\n<li>Keeping the controller &#8220;blind&#8221; to power stage faults is generally not recommended, as the fault condition may require specific control actions.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Going-further-with-the-open-rack%E2%80%A6\"><\/span>Going further with the open 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 an open 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-buck-converter?currentThread=power-electronic-bundle\">How to build a buck converter (PN119)<\/a><\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>This document provides guidance for integrating imperix power modules into an open rack (type A). Intended for first-time users, the guide details essential mechanical considerations,&#8230;<\/p>\n","protected":false},"author":8,"featured_media":3029,"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":[111],"guidedreadings":[],"tutorials":[],"user-manuals":[144],"coauthors":[62],"class_list":["post-1057","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-help","related-products-pm","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>Open rack - Quick start guide - imperix<\/title>\n<meta name=\"description\" content=\"This quick start guide provides instructions for installing imperix power modules into an open rack type A.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/imperix.com\/doc\/help\/open-rack-quick-start-guide\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Open rack - Quick start guide - imperix\" \/>\n<meta property=\"og:description\" content=\"This quick start guide provides instructions for installing imperix power modules into an open rack type A.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/imperix.com\/doc\/help\/open-rack-quick-start-guide\" \/>\n<meta property=\"og:site_name\" content=\"imperix\" \/>\n<meta property=\"article:published_time\" content=\"2026-02-12T14:54:26+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-02-19T17:01:58+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/imperix.com\/doc\/wp-content\/uploads\/2021\/03\/3_2_ratio_PN202.png\" \/>\n\t<meta property=\"og:image:width\" content=\"450\" \/>\n\t<meta property=\"og:image:height\" content=\"300\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"Simon Strobl\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Simon Strobl\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"10 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/imperix.com\\\/doc\\\/help\\\/open-rack-quick-start-guide#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/imperix.com\\\/doc\\\/help\\\/open-rack-quick-start-guide\"},\"author\":{\"name\":\"Simon Strobl\",\"@id\":\"https:\\\/\\\/imperix.com\\\/doc\\\/#\\\/schema\\\/person\\\/112ed48191405cbe3befbc660d112803\"},\"headline\":\"Open rack &#8211; 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