{"product_id":"evd4903-e-lenze-4900-series-high-power-dc-drive-controller","title":"EVD4903-E Lenze 4900-series High-Power DC Drive Controller","description":"\u003ch3\u003eProduct Overview\u003c\/h3\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eEVD4903-E (EVD4903-E)\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eis a high-performance DC drive controller within the classic Lenze 4900-series, engineered to provide precise speed and torque regulation for industrial DC motors. Delivering an adjustable output range of 310-420 V with current capacities spanning 3.5 to 25 A, this unit is a critical component for heavy-duty applications such as continuous steel casting, industrial paper mills, and plastic extrusion lines. In these high-stakes B2B environments, the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eEVD4903-E\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eacts as the primary power regulator, translating 400 V mains input into controlled kinetic energy. Its robust German engineering ensures reliable operation in centralized control cabinets, where its ability to maintain constant motor flux and reactive current compensation is vital for reducing unplanned downtime and maximizing the operational lifespan of legacy DC motor assets.\u003c\/p\u003e\n\u003ch3\u003eTechnical Configuration\u003c\/h3\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eEVD4903-E\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003earchitecture is designed around a fully controlled thyristor bridge configuration, optimized for 3-phase mains operation. It features integrated field supply and armature voltage regulation, providing superior linearity across the entire speed range. The hardware is built for durability, weighing 12.80 kg, which reflects the substantial copper and aluminum heat-sinking required for managing up to 25 A of continuous current. The internal control logic supports various feedback modes, including tachogenerator or armature voltage feedback, ensuring stability even under fluctuating load conditions. Its 12.8 cm depth is specifically tailored for space-efficient mounting on backplates, while the terminal layout facilitates straightforward wiring for both power electronics and low-voltage control signals.\u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr class=\"firstRow\"\u003e\n\u003ctd\u003e\u003cstrong\u003eAttribute\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eSpecification Details\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eModel\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eEVD4903-E\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eBrand\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eLenze\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eOrigin\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eGermany\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eProduct Range\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e4900-series\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eInput Voltage\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e3 x 400 VAC (50\/60 Hz)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eOutput Armature Voltage\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e310 - 420 VDC\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eRated Current Range\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e3.5 - 25 A\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eWeight\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e12.80 kg\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eDimensions (Depth)\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e12.8 cm\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eProduct Status\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eObsolete (Legacy Support)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eControl Type\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eThyristor-controlled DC Drive\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eCommodity Code\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e85044095\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eTechnical FAQs\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eHow do I adjust the current limit on the EVD4903-E for a specific motor?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe current limit (I-max) is typically adjusted via on-board potentiometers or through the parameterization interface. You must calibrate this to the rated current on your motor nameplate to prevent thermal overload and protect the motor's commutator.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs this controller compatible with both shunt-wound and permanent magnet DC motors?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYes. While optimized for shunt-wound motors requiring an external field supply, the EVD4903-E can be configured for permanent magnet motors by disabling or not utilizing the internal field regulator terminals.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat are the primary indicators for a phase loss fault on this unit?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA phase loss or mains failure is typically signaled by an internal diagnostic LED or a dedicated fault relay output. This protection prevents the thyristor bridge from operating under unbalanced loads, which could otherwise damage the internal SCR modules.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I replace an EVD4903-E with a newer Lenze AC drive series?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eDirect replacement is complex because this unit drives DC motors. Moving to a newer AC series would require replacing the motor itself or utilizing a high-power AC-to-DC conversion interface, which is rarely cost-effective compared to installing a refurbished or new-old-stock 4900-series unit.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003eEngineering \u0026amp; Installation Guide\u003c\/h3\u003e\n\u003cp\u003eFor the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eEVD4903-E\u003c\/strong\u003e, a vertical mounting orientation on a solid metal backplane is mandatory to facilitate natural convection through the large internal heat sink. Maintain a minimum clearance of 150 mm above and below the unit for unobstructed airflow. Because DC drives generate significant brush-fire noise and electrical harmonics, use shielded motor cables and ensure a 360-degree ground connection at the cabinet entry point. To protect the thyristors against high-energy mains transients, the installation of a 3-phase line reactor is highly recommended. During maintenance, check for carbon dust accumulation around the terminals, especially in environments with high motor brush wear, as this can lead to creepage currents and tracking faults.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Lenze","offers":[{"title":"Default Title","offer_id":53105066672491,"sku":"EVD4903-E","price":100.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0953\/3227\/0443\/files\/evd4903-e-h1zow0bnwnl.png?v=1776236390","url":"https:\/\/www.plcprotech.com\/products\/evd4903-e-lenze-4900-series-high-power-dc-drive-controller","provider":"PLC ProTech Ltd.","version":"1.0","type":"link"}