{"id":16669,"date":"2026-09-04T11:41:02","date_gmt":"2026-09-04T03:41:02","guid":{"rendered":"https:\/\/www.wehopower.com\/?post_type=news&#038;p=16669"},"modified":"2026-09-16T13:34:37","modified_gmt":"2026-09-16T05:34:37","slug":"how-to-set-voltage-current-ac-dc-power-supply","status":"publish","type":"news","link":"https:\/\/www.wehopower.com\/pt\/news\/how-to-set-voltage-current-ac-dc-power-supply\/","title":{"rendered":"Como ajustar tens\u00e3o e corrente em uma fonte de alimenta\u00e7\u00e3o AC-DC ajust\u00e1vel"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_86 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">\u00cdndice<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Alternar \u00edndice de conte\u00fado\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Alternar<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewbox=\"0 0 24 24\" version=\"1.2\" baseprofile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.wehopower.com\/pt\/news\/how-to-set-voltage-current-ac-dc-power-supply\/#Introduction\" >Introdu\u00e7\u00e3o<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.wehopower.com\/pt\/news\/how-to-set-voltage-current-ac-dc-power-supply\/#What_Is_an_Adjustable_AC-DC_Power_Supply\" >What Is an Adjustable AC-DC 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:\/\/www.wehopower.com\/pt\/news\/how-to-set-voltage-current-ac-dc-power-supply\/#Understanding_Voltage_and_Current_Before_Adjustment\" >Understanding Voltage and Current Before Adjustment<\/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:\/\/www.wehopower.com\/pt\/news\/how-to-set-voltage-current-ac-dc-power-supply\/#What_Does_Voltage_Control_Mean\" >What Does Voltage Control Mean?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.wehopower.com\/pt\/news\/how-to-set-voltage-current-ac-dc-power-supply\/#What_Does_Current_Limit_Mean\" >What Does Current Limit Mean?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.wehopower.com\/pt\/news\/how-to-set-voltage-current-ac-dc-power-supply\/#Voltage_vs_Current_Which_One_Matters_More\" >Voltage vs Current: Which One Matters More?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.wehopower.com\/pt\/news\/how-to-set-voltage-current-ac-dc-power-supply\/#Constant_Voltage_vs_Constant_Current_Mode\" >Constant Voltage vs Constant Current Mode<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.wehopower.com\/pt\/news\/how-to-set-voltage-current-ac-dc-power-supply\/#Protection_Features_You_Should_Understand_Before_Adjusting\" >Protection Features You Should Understand Before Adjusting<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.wehopower.com\/pt\/news\/how-to-set-voltage-current-ac-dc-power-supply\/#Over-Voltage_Protection\" >Prote\u00e7\u00e3o de sobretens\u00e3o<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/www.wehopower.com\/pt\/news\/how-to-set-voltage-current-ac-dc-power-supply\/#Over-Current_Protection\" >Over-Current Protection<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/www.wehopower.com\/pt\/news\/how-to-set-voltage-current-ac-dc-power-supply\/#Over-Temperature_Protection\" >Over-Temperature Protection<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/www.wehopower.com\/pt\/news\/how-to-set-voltage-current-ac-dc-power-supply\/#Short-Circuit_Protection\" >Short-Circuit Protection<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/www.wehopower.com\/pt\/news\/how-to-set-voltage-current-ac-dc-power-supply\/#How_to_Set_Voltage_on_an_Adjustable_AC-DC_Power_Supply\" >How to Set Voltage on an Adjustable AC-DC Power Supply<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/www.wehopower.com\/pt\/news\/how-to-set-voltage-current-ac-dc-power-supply\/#Step_1_Check_Device_Voltage_Requirements\" >Step 1: Check Device Voltage Requirements<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/www.wehopower.com\/pt\/news\/how-to-set-voltage-current-ac-dc-power-supply\/#Step_2_Connect_the_Power_Supply_Correctly\" >Step 2: Connect the Power Supply Correctly<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/www.wehopower.com\/pt\/news\/how-to-set-voltage-current-ac-dc-power-supply\/#Step_3_Adjust_Output_Voltage\" >Step 3: Adjust Output Voltage<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/www.wehopower.com\/pt\/news\/how-to-set-voltage-current-ac-dc-power-supply\/#Step_4_Verify_Voltage_Before_Connecting_Load\" >Step 4: Verify Voltage Before Connecting Load<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"https:\/\/www.wehopower.com\/pt\/news\/how-to-set-voltage-current-ac-dc-power-supply\/#How_to_Set_Current_Limit_on_an_Adjustable_AC-DC_Power_Supply\" >How to Set Current Limit on an Adjustable AC-DC Power Supply<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-19\" href=\"https:\/\/www.wehopower.com\/pt\/news\/how-to-set-voltage-current-ac-dc-power-supply\/#Step_1_Determine_Required_Current\" >Step 1: Determine Required Current<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-20\" href=\"https:\/\/www.wehopower.com\/pt\/news\/how-to-set-voltage-current-ac-dc-power-supply\/#Step_2_Adjust_Current_Limit\" >Step 2: Adjust Current Limit<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-21\" href=\"https:\/\/www.wehopower.com\/pt\/news\/how-to-set-voltage-current-ac-dc-power-supply\/#Step_3_Understand_Current_Limiting_Behavior\" >Step 3: Understand Current Limiting Behavior<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-22\" href=\"https:\/\/www.wehopower.com\/pt\/news\/how-to-set-voltage-current-ac-dc-power-supply\/#Common_Mistakes_When_Adjusting_AC-DC_Power_Supplies\" >Common Mistakes When Adjusting AC-DC Power Supplies<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-23\" href=\"https:\/\/www.wehopower.com\/pt\/news\/how-to-set-voltage-current-ac-dc-power-supply\/#Troubleshooting_Incorrect_Voltage_and_Current_Settings\" >Troubleshooting Incorrect Voltage and Current Settings<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-24\" href=\"https:\/\/www.wehopower.com\/pt\/news\/how-to-set-voltage-current-ac-dc-power-supply\/#FAQs\" >Perguntas frequentes<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-25\" href=\"https:\/\/www.wehopower.com\/pt\/news\/how-to-set-voltage-current-ac-dc-power-supply\/#What_happens_if_voltage_is_too_high\" >What happens if voltage is too high?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-26\" href=\"https:\/\/www.wehopower.com\/pt\/news\/how-to-set-voltage-current-ac-dc-power-supply\/#Should_voltage_or_current_be_adjusted_first\" >Should voltage or current be adjusted first?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-27\" href=\"https:\/\/www.wehopower.com\/pt\/news\/how-to-set-voltage-current-ac-dc-power-supply\/#Does_a_higher_current_setting_damage_my_device\" >Does a higher current setting damage my device?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-28\" href=\"https:\/\/www.wehopower.com\/pt\/news\/how-to-set-voltage-current-ac-dc-power-supply\/#Can_I_use_an_adjustable_power_supply_for_LED_lighting\" >Can I use an adjustable power supply for LED lighting?<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-29\" href=\"https:\/\/www.wehopower.com\/pt\/news\/how-to-set-voltage-current-ac-dc-power-supply\/#Conclusion\" >Conclus\u00e3o<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-30\" href=\"https:\/\/www.wehopower.com\/pt\/news\/how-to-set-voltage-current-ac-dc-power-supply\/#Related_Resources\" >Recursos relacionados<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"Introduction\"><\/span>Introdu\u00e7\u00e3o<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>If you run a production line, test bench, or field system, knowing how to set voltage and current on an <strong>Adjustable AC-DC Power Supply<\/strong> protects both your load and your budget. A variable AC-DC power supply lets you dial in exactly the output your device needs instead of forcing it to accept a fixed rail. Done wrong, it can trip protection or stress sensitive equipment. This guide covers the concepts, the procedure, and the setup mistakes WEHO Power&#8217;s engineering team sees most often.<\/p>\n<p>As a manufacturer, WEHO Power builds <a href=\"https:\/\/www.wehopower.com\/pt\/product_category\/enclosed-switching-power-supply\/\" target=\"_blank\" rel=\"noopener\">enclosed switching power supply<\/a> families and high-power adjustable units for integrators and OEMs worldwide. Every adjustable model passes a 100% high-temperature full-load burn-in and is produced under ISO9001 with CE\/RoHS\/FCC\/CCC certifications, and our 1,000+ models support OEM\/ODM. This guide reflects real production experience, not a spec sheet.<!-- replace src with WordPress Media Library URL after upload --><\/p>\n<div style=\"border: 2px solid #DB261E; border-radius: 8px; padding: 20px 24px; margin: 28px 0; background: #FFF6F5;\">\n<p style=\"color: #db261e; margin: 0px 0px 8px; font-size: 20px; font-weight: bold; text-align: center;\">Need a configurable supply sized for your load?<\/p>\n<p style=\"margin: 0px 0px 14px; color: #333333; text-align: center;\">WEHO&#8217;s adjustable AC-DC power supplies cover single-output bench and rack needs with CV\/CC control and full OVP\/OCP\/OTP\/SCP protection. Send us your voltage, current, and application and we will match a model.<\/p>\n<p style=\"margin: 0px; text-align: center;\"><a style=\"display: inline-block; background: #DB261E; color: #ffffff; padding: 11px 22px; border-radius: 5px; text-decoration: none; font-weight: bold;\" href=\"https:\/\/www.wehopower.com\/pt\/contact\/\" target=\"_blank\" rel=\"noopener\">Request a Free Quote<\/a><\/p>\n<\/div>\n<h2><span class=\"ez-toc-section\" id=\"What_Is_an_Adjustable_AC-DC_Power_Supply\"><\/span>What Is an Adjustable AC-DC Power Supply?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Um <strong>Adjustable AC-DC Power Supply<\/strong> is a switching power supply that converts AC mains into a DC output whose voltage (and often current limit) you set with on-board trimmers or a digital interface. Unlike a fixed-output unit, a variable AC-DC power supply gives you a usable range, such as 0\u201330V or 0\u201360V, with an independent current-limit setting. WEHO&#8217;s <a href=\"https:\/\/www.wehopower.com\/pt\/product-category\/adjustable-high-power-smps\/\" target=\"_blank\" rel=\"noopener\">adjustable high-power SMPS<\/a> family includes the SE-3000W and SP-9000 with active PFC, built for industrial loads. Because output is configurable, one enclosure serves several stations, and an adjustable output switching power supply stays in constant use on test benches.<\/p>\n<p><a href=\"https:\/\/www.wehopower.com\/pt\/product-category\/se-sed-sp-series-adjustable-ac-to-dc-power-supply\/\" target=\"_blank\" rel=\"noopener\"><img fetchpriority=\"high\" decoding=\"async\" class=\"wp-image-8632 size-full\" title=\"Adjustable High Power Smps a1\" src=\"https:\/\/i1.wp.com\/www.wehopower.com\/wp-content\/uploads\/2025\/07\/Adjustable-High-Power-Smps-a1.jpg?quality=85&strip=all\" alt=\"Smps ajust\u00e1veis \u200b\u200bde alta pot\u00eancia\" width=\"750\" height=\"750\" srcset=\"https:\/\/i1.wp.com\/www.wehopower.com\/wp-content\/uploads\/2025\/07\/Adjustable-High-Power-Smps-a1.jpg?quality=85&strip=all 750w, https:\/\/i1.wp.com\/www.wehopower.com\/wp-content\/uploads\/2025\/07\/Adjustable-High-Power-Smps-a1-300x300.jpg?quality=85&strip=all 300w, https:\/\/i1.wp.com\/www.wehopower.com\/wp-content\/uploads\/2025\/07\/Adjustable-High-Power-Smps-a1-500x500.jpg?quality=85&strip=all 500w\" sizes=\"(max-width: 750px) 100vw, 750px\" \/><\/a><\/p>\n<p>&nbsp;<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Understanding_Voltage_and_Current_Before_Adjustment\"><\/span>Understanding Voltage and Current Before Adjustment<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Before turning any trimmer, understand what voltage and current mean, because confusing the two causes most setup errors. This section builds the foundation, then a quick sizing reference.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"What_Does_Voltage_Control_Mean\"><\/span>What Does Voltage Control Mean?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Voltage is the potential the supply holds at its output terminals. On an adjustable output switching power supply, the voltage control sets the target the regulator maintains while the load stays within limits. Always preset voltage before connecting the load.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"What_Does_Current_Limit_Mean\"><\/span>What Does Current Limit Mean?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Current limit is the maximum current the supply delivers before it backs off. It is a ceiling, not a target. If the load draws more than the limit, the supply protects itself and the load by reducing output rather than pushing full current. A sensible <strong>AC-DC Power Supply Current Setting<\/strong> is the most important safety step for an unknown or delicate device.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Voltage_vs_Current_Which_One_Matters_More\"><\/span>Voltage vs Current: Which One Matters More?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Neither is &#8220;more important&#8221; \u2014 they play different roles. Voltage determines whether the device operates at all; current determines how much work the supply can support. A 24V motor at startup may briefly want far more current than it draws running, so size the limit to clear inrush. For most tasks, set voltage to rating and use current limit as a safety backstop.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Constant_Voltage_vs_Constant_Current_Mode\"><\/span>Constant Voltage vs Constant Current Mode<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>A constant voltage vs constant current mode power supply runs in one of two regulated states. In <strong>Constant Voltage (CV)<\/strong> mode, the output holds the set voltage and current varies with the load. In <strong>Constant Current (CC)<\/strong> mode, the load has hit the current limit, so the supply holds current steady and lets voltage fall. A CV\/CC LED shows the active mode. Most testing runs in CV; charging and current-limited burn-in run in CC.<!-- replace src with WordPress Media Library URL after upload --><\/p>\n<p><strong>Power Sizing Quick Reference<\/strong><\/p>\n<p>Use the table below to map a typical load to a WEHO adjustable family. Wattage equals voltage times current (W = V \u00d7 A), so size the supply above your calculated wattage with headroom for inrush and component aging. This is the fastest way to sanity-check your <strong>AC-DC Power Supply Voltage Setting<\/strong> and current limit before you open the enclosure.<\/p>\n<table style=\"border-collapse: collapse; width: 100%; margin: 18px 0; font-size: 15px;\">\n<thead>\n<tr style=\"background: #DB261E; color: #ffffff;\">\n<th style=\"border: 1px solid #dddddd; padding: 10px 12px; text-align: left;\">Model Family<\/th>\n<th style=\"border: 1px solid #dddddd; padding: 10px 12px; text-align: left;\">Wattage Range<\/th>\n<th style=\"border: 1px solid #dddddd; padding: 10px 12px; text-align: left;\">CV \/ CC<\/th>\n<th style=\"border: 1px solid #dddddd; padding: 10px 12px; text-align: left;\">Notes<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"border: 1px solid #dddddd; padding: 10px 12px;\">SE-3000W adjustable<\/td>\n<td style=\"border: 1px solid #dddddd; padding: 10px 12px;\">0\u20133000 W<\/td>\n<td style=\"border: 1px solid #dddddd; padding: 10px 12px;\">CV \/ CC<\/td>\n<td style=\"border: 1px solid #dddddd; padding: 10px 12px;\">Single-output, user-set voltage and current limit; 100% burn-in tested.<\/td>\n<\/tr>\n<tr style=\"background: #fafafa;\">\n<td style=\"border: 1px solid #dddddd; padding: 10px 12px;\">SP-9000 PFC<\/td>\n<td style=\"border: 1px solid #dddddd; padding: 10px 12px;\">0\u20139000 W<\/td>\n<td style=\"border: 1px solid #dddddd; padding: 10px 12px;\">CV \/ CC<\/td>\n<td style=\"border: 1px solid #dddddd; padding: 10px 12px;\">Active PFC, high-power adjustable for demanding industrial loads.<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #dddddd; padding: 10px 12px;\">LRS series (slim)<\/td>\n<td style=\"border: 1px solid #dddddd; padding: 10px 12px;\">35\u2013600 W<\/td>\n<td style=\"border: 1px solid #dddddd; padding: 10px 12px;\">CV<\/td>\n<td style=\"border: 1px solid #dddddd; padding: 10px 12px;\">Compact enclosed units; fixed or adjustable variants for space-limited panels.<\/td>\n<\/tr>\n<tr style=\"background: #fafafa;\">\n<td style=\"border: 1px solid #dddddd; padding: 10px 12px;\">SD series DC-DC<\/td>\n<td style=\"border: 1px solid #dddddd; padding: 10px 12px;\">60\u2013600 W<\/td>\n<td style=\"border: 1px solid #dddddd; padding: 10px 12px;\">CV<\/td>\n<td style=\"border: 1px solid #dddddd; padding: 10px 12px;\">Enclosed DC-DC conversion for bus-voltage stabilization in control systems.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><em>Tip for buyers: a live V \u00d7 A = W calculator would let you enter your load&#8217;s voltage and current and instantly see the recommended wattage and model family. WEHO recommends adding a calculator\/form plugin to this page so visitors can size a supply without a sales call.<\/em><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Protection_Features_You_Should_Understand_Before_Adjusting\"><\/span>Protection Features You Should Understand Before Adjusting<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Industrial adjustable supplies include layers of protection. WEHO&#8217;s adjustable lines integrate the full set below, and the <a href=\"https:\/\/www.wehopower.com\/pt\/product\/sp-9000-single-output-power-supply-with-pfc\/\" target=\"_blank\" rel=\"noopener\">SP-9000 PFC power supply<\/a> carries every protection as standard.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Over-Voltage_Protection\"><\/span>Prote\u00e7\u00e3o de sobretens\u00e3o<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Over-Voltage Protection (OVP) clamps or shuts down the output if voltage exceeds a safe threshold, protecting sensitive electronics. It is your backstop if the trimmer is set too high or a component fails.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Over-Current_Protection\"><\/span>Over-Current Protection<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Over-Current Protection (OCP) works with your manual current limit to cut or fold back output when current exceeds a safe bound, protecting both supply and load.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Over-Temperature_Protection\"><\/span>Over-Temperature Protection<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Over-Temperature Protection (OTP) monitors internal temperature and reduces output or shuts down if the unit overheats. Every WEHO adjustable model passes a 100% high-temperature full-load burn-in, so OTP thresholds are validated before shipment.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Short-Circuit_Protection\"><\/span>Short-Circuit Protection<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Short-Circuit Protection (SCP) lets the supply survive a direct output short without damage, then recover automatically when the fault clears. This matters on busy benches where a probe slip is always possible.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"How_to_Set_Voltage_on_an_Adjustable_AC-DC_Power_Supply\"><\/span>How to Set Voltage on an Adjustable AC-DC Power Supply<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>A correct <strong>AC-DC Power Supply Voltage Setting<\/strong> starts with the load disconnected. Follow this sequence for a clean, safe setup.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Step_1_Check_Device_Voltage_Requirements\"><\/span>Step 1: Check Device Voltage Requirements<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Read the nameplate or datasheet of the device you intend to power, noting its exact rated voltage, tolerance, and any inrush-current note. That target is what you will dial into the supply.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Step_2_Connect_the_Power_Supply_Correctly\"><\/span>Step 2: Connect the Power Supply Correctly<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Connect the AC input to a properly rated mains outlet and the output terminals with correct polarity, but keep the output open-circuit for now. Confirm the supply is off before making terminal connections, and verify the input range matches your local mains.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Step_3_Adjust_Output_Voltage\"><\/span>Step 3: Adjust Output Voltage<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Power on with no load, then turn the current-limit trimmer to maximum so the supply stays in CV mode. Use the voltage control while watching a calibrated multimeter at the output terminals, and trim until the meter reads your target, for example 24.0V. The CV LED should be lit.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Step_4_Verify_Voltage_Before_Connecting_Load\"><\/span>Step 4: Verify Voltage Before Connecting Load<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Before touching the load, confirm the open-circuit voltage is stable and matches the device rating. Only then power down, connect the device with correct polarity, and power up. The voltage should hold at the set point under load; if it sags, move to the current-limit steps below.<!-- replace src with WordPress Media Library URL after upload --><\/p>\n<p>For a concrete reference unit, the <a href=\"https:\/\/www.wehopower.com\/pt\/product\/se-3000w-single-output-switching-power-supply\/\" target=\"_blank\" rel=\"noopener\">SE-3000W adjustable power supply<\/a> follows this same set-and-connect routine and is typical of an SE series adjustable industrial power supply used on production floors.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"How_to_Set_Current_Limit_on_an_Adjustable_AC-DC_Power_Supply\"><\/span>How to Set Current Limit on an Adjustable AC-DC Power Supply<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Once voltage is set, define the current ceiling to protect unknown or fragile loads. The supply should be in CV mode with no load.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Step_1_Determine_Required_Current\"><\/span>Step 1: Determine Required Current<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Find the load&#8217;s rated operating current from its nameplate, then add margin for inrush. A motor or capacitive load may briefly pull several times its running current, so size the limit to clear the surge yet still guard against a fault.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Step_2_Adjust_Current_Limit\"><\/span>Step 2: Adjust Current Limit<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>With voltage at target, turn the current-limit trimmer down until the CC LED lights, then back it up to the maximum current your load should ever draw. For a known load, set the limit about 10\u201320% above its rated operating current to allow for inrush.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Step_3_Understand_Current_Limiting_Behavior\"><\/span>Step 3: Understand Current Limiting Behavior<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>A current limit is not a constant-current command; it is a ceiling. In normal operation the supply stays in CV and the limit is invisible. Only when the load exceeds the ceiling does the supply drop into CC and hold current while voltage falls. Recognize this so a CC reading is not mistaken for a fault.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Common_Mistakes_When_Adjusting_AC-DC_Power_Supplies\"><\/span>Common Mistakes When Adjusting AC-DC Power Supplies<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ul>\n<li><strong>Connecting the load before setting voltage.<\/strong> This risks applying the wrong rail to a sensitive device. Always preset voltage open-circuit first.<\/li>\n<li><strong>Leaving the current limit at maximum.<\/strong> A wide-open limit removes your safety ceiling; a fault then depends only on OCP, which may allow more current than your load survives.<\/li>\n<li><strong>Trusting the panel meter alone.<\/strong> Panel meters are approximate. Verify with a calibrated multimeter, especially for precision work.<\/li>\n<li><strong>Ignoring inrush current.<\/strong> Motors and capacitive loads draw a surge at turn-on. Size the limit and the supply wattage to absorb it.<\/li>\n<li><strong>Poor ventilation.<\/strong> Stacking units or blocking vents triggers OTP and causes intermittent shutdowns that look like faults.<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"Troubleshooting_Incorrect_Voltage_and_Current_Settings\"><\/span>Troubleshooting Incorrect Voltage and Current Settings<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ol>\n<li><strong>Output reads zero while on.<\/strong> The current limit may be near zero, forcing CC at no useful voltage. Raise the limit.<\/li>\n<li><strong>Voltage sags under load.<\/strong> The supply may be in CC from a low limit, or undersized for the wattage. Confirm W = V \u00d7 A headroom.<\/li>\n<li><strong>CC LED stays on in normal use.<\/strong> The load draws more than the set limit. Raise it if safe, or choose a higher-wattage model such as the SE-3000W or SP-9000.<\/li>\n<li><strong>Unit shuts down after minutes.<\/strong> Likely OTP from poor airflow or ambient heat. Improve ventilation and re-test.<\/li>\n<li><strong>Voltage drifts or is unstable.<\/strong> Verify AC input is in range and terminals are tight; loose connections cause intermittent readings.<\/li>\n<\/ol>\n<div style=\"border: 2px solid #DB261E; border-radius: 8px; padding: 20px 24px; margin: 28px 0; background: #FFF6F5;\">\n<p style=\"color: #db261e; margin: 0px 0px 8px; font-size: 20px; font-weight: bold; text-align: center;\">Not sure which adjustable supply fits your specs?<\/p>\n<p style=\"margin: 0px 0px 14px; color: #333333; text-align: center;\">Our engineering team can recommend voltage range, current limit, and protection rating for your exact application, and support OEM\/ODM branding for volume orders.<\/p>\n<p style=\"margin: 0px; text-align: center;\"><a style=\"display: inline-block; background: #DB261E; color: #ffffff; padding: 11px 22px; border-radius: 5px; text-decoration: none; font-weight: bold;\" href=\"https:\/\/www.wehopower.com\/pt\/contact\/\" target=\"_blank\" rel=\"noopener\">Request a Free Quote<\/a><\/p>\n<\/div>\n<h2><span class=\"ez-toc-section\" id=\"FAQs\"><\/span>Perguntas frequentes<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"What_happens_if_voltage_is_too_high\"><\/span>What happens if voltage is too high?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>If output voltage is set above your device&#8217;s rating, you risk overheating, permanent damage, or immediate failure. OVP is a backstop, not a substitute for a correct AC-DC Power Supply Voltage Setting. Always preset and verify voltage with a multimeter first.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Should_voltage_or_current_be_adjusted_first\"><\/span>Should voltage or current be adjusted first?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Adjust voltage first: set the current limit temporarily high, dial the voltage to the device rating with no load, then lower the limit to your safety ceiling. This keeps the supply in CV.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Does_a_higher_current_setting_damage_my_device\"><\/span>Does a higher current setting damage my device?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>No. A current limit is a ceiling, not a forced current; your device draws only what it needs, and a high limit only lets more fault current flow before protection acts. Set it just above normal operating current.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Can_I_use_an_adjustable_power_supply_for_LED_lighting\"><\/span>Can I use an adjustable power supply for LED lighting?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>You can power LED modules within the supply&#8217;s adjustable range, but WEHO&#8217;s standard LED drivers are constant-current (CC) or constant-voltage (CV) fixed units, not dimmable. For bench use, drive the LEDs within rated voltage and let the current limit protect the string; for production, a dedicated LED driver fits better.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Conclusion\"><\/span>Conclus\u00e3o<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Setting voltage and current on an <strong>Adjustable AC-DC Power Supply<\/strong> is straightforward once you separate the two controls: voltage is your target rail, and the current limit is your safety ceiling. Preset voltage open-circuit, set a sensible current limit, verify with a multimeter, and respect the built-in OVP\/OCP\/OTP\/SCP protection. The same discipline keeps loads safe and uptime high.<\/p>\n<p>Need help matching an <a href=\"https:\/\/www.wehopower.com\/pt\/product-category\/adjustable-high-power-smps\/\" target=\"_blank\" rel=\"noopener\">adjustable high-power SMPS<\/a> to your application? <a href=\"https:\/\/www.wehopower.com\/pt\/contact\/\" target=\"_blank\" rel=\"noopener\">request a quote<\/a> and our team will specify voltage range, current limit, and certifications for your market.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Related_Resources\"><\/span>Recursos relacionados<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ul>\n<li><a href=\"https:\/\/www.wehopower.com\/pt\/news\/what-is-an-smps-switch-mode-power-supply\/\" target=\"_blank\" rel=\"noopener\">What is an SMPS (Switch Mode Power Supply)?<\/a><\/li>\n<li><a href=\"https:\/\/www.wehopower.com\/pt\/news\/the-composition-of-switching-power-supply\/\" target=\"_blank\" rel=\"noopener\">The Composition of a Switching Power Supply<\/a><\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"<p>A practical, manufacturer-authored guide from WEHO Power on setting output voltage and current limit on an Adjustable AC-DC Power Supply. It explains CV\/CC modes, built-in protection (OVP\/OCP\/OTP\/SCP), a step-by-step setup, common mistakes, troubleshooting, and a static Power Sizing Quick Reference table. Targets US B2B industrial buyers evaluating or operating variable AC-DC power supplies.<\/p>","protected":false},"author":4,"featured_media":17765,"parent":0,"menu_order":105,"comment_status":"closed","ping_status":"closed","template":"","format":"standard","meta":{"_acf_changed":false,"_joinchat":[],"footnotes":""},"news_category":[149,148],"class_list":["post-16669","news","type-news","status-publish","format-standard","has-post-thumbnail","hentry","news_category-blog","news_category-industry-news","entry"],"acf":[],"post_mailing_queue_ids":[],"_links":{"self":[{"href":"https:\/\/www.wehopower.com\/pt\/wp-json\/wp\/v2\/news\/16669","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.wehopower.com\/pt\/wp-json\/wp\/v2\/news"}],"about":[{"href":"https:\/\/www.wehopower.com\/pt\/wp-json\/wp\/v2\/types\/news"}],"author":[{"embeddable":true,"href":"https:\/\/www.wehopower.com\/pt\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/www.wehopower.com\/pt\/wp-json\/wp\/v2\/comments?post=16669"}],"version-history":[{"count":4,"href":"https:\/\/www.wehopower.com\/pt\/wp-json\/wp\/v2\/news\/16669\/revisions"}],"predecessor-version":[{"id":17766,"href":"https:\/\/www.wehopower.com\/pt\/wp-json\/wp\/v2\/news\/16669\/revisions\/17766"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.wehopower.com\/pt\/wp-json\/wp\/v2\/media\/17765"}],"wp:attachment":[{"href":"https:\/\/www.wehopower.com\/pt\/wp-json\/wp\/v2\/media?parent=16669"}],"wp:term":[{"taxonomy":"news_category","embeddable":true,"href":"https:\/\/www.wehopower.com\/pt\/wp-json\/wp\/v2\/news_category?post=16669"}],"curies":[{"name":"wp ent\u00e3o","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}