{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"VW3A3E408","brand":"Schneider Electric","brandSlug":"schneider","productSlug":"VW3A3E408","canonicalUrl":"https://aoctrl.com/schneider/VW3A3E408","factsUrl":"https://aoctrl.com/api/mcp/products/VW3A3E408","rawCanonicalId":null},"summary":{"shortDescription":"Schneider Electric Altivar series, resolver encoder interface module VW3A3E408, selectable transformation ratios 4:1/3:1/2:1/1:1, excitation voltage 1.25–5.6 Vrms.","salesMarkdown":"The Schneider Electric VW3A3E408 is a resolver encoder interface module for the Altivar drive range. It accepts resolver feedback and converts it to a digital speed signal the drive can close the loop on — critical for position-regulated axes or low-speed torque control where an incremental encoder would drift. The module supports selectable transformation ratios of 4:1, 3:1, 2:1, and 1:1, so it matches resolvers with different primary-to-secondary turns ratios without an external scaling transformer. ## Excitation and feedback parameters Excitation voltage is adjustable between 1.25 and 5.6 Vrms, with a maximum excitation current of 50 mA — enough to drive most standard resolvers up to 200 m of cable. The excitation frequency is field-selectable at 4, 8, or 12 kHz; the 4 kHz setting suits longer cable runs where capacitive losses would otherwise attenuate the carrier, while 12 kHz gives a faster update for high-speed spindle applications. Secondary voltage is fixed at 1 Vrms, which is the resolver's output at the rated transformation ratio. ## Speed resolution and pole matching Speed feedback resolution is 12 bits (±1 bit), giving 4096 counts per revolution at the maximum pulse count. The module supports motor pole counts of 2, 4, 6, or 8, and automatically pairs the encoder pole count (2, 4, 6, or 8) with the motor poles to keep the electrical angle aligned. Maximum shaft speed depends on the pole combination: 7500 rpm with 2 motor poles and 4096 pulses per revolution, down to 1875 rpm with 8 motor poles and 512 pulses per revolution. This pole-matching logic is what lets the drive compute rotor position without an external cam or hall sensor. ## Connection and wiring Electrical connection is via screw terminals accepting 0.2 mm² to 1 mm² (AWG 24 to AWG 17). The maximum cable distance between the module and the resolver is 200 m, provided the cable capacitance and the excitation frequency are within the drive's guidelines. For a 12 kHz carrier, keep the cable under 100 m to avoid signal degradation; 4 kHz allows the full 200 m.","metaTitle":"Schneider Electric VW3A3E408 Resolver Encoder Interface, 4:1","metaDescription":"Schneider Electric VW3A3E408 resolver encoder interface card for Altivar drives. Selectable ratios 4:1, 3:1, 2:1, 1:1. 1.25–5.6 Vrms excitation. Active production. Quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Motor Control Accessories"],"specifications":{"Ratio":"Transformation : 4:1, 3:1, 2:1, 1:1","title":"VW3A3E408","description":"resolver encoder interface card - 1.25..5.6 Vrms","Encoder type":"Resolver","lifecycle_stage":"mature","Range of product":"Altivar","Secondary Voltage":"1 Vrms","Excitation current":"50 mA maximum","Excitation voltage":"1.25...5.6 Vrms","Excitation frequency":"Adjustable : 4, 8, 12 kHz","Electrical connection":"Terminal, connection capacity: 0.2 mm² (AWG 24) Terminal, connection capacity: 0.2 mm² (AWG 24) Terminal, connection capacity: 0.2 mm² (AWG 24) Terminal, connection capacity: 0.5 mm² (AWG 20) Terminal, connection capacity: 0.5 mm² (AWG 20) Terminal, connection capacity: 0.5 mm² (AWG 20) Terminal, connection capacity: 0.75 mm² (AWG 18) Terminal, connection capacity: 1 mm² (AWG 17) <200 m cable length, encoder, 50 mA","Number of encoder poles":"Encoder poles: 2, motor poles: 2 7500 rpm, number of pulses per revolution = 4096 Encoder poles: 2, motor poles: 4 3750 rpm, number of pulses per revolution = 2048 Encoder poles: 2, motor poles: 6 2500 rpm, number of pulses per revolution = 1024 Encoder poles: 2, motor poles: 8 1875 rpm, number of pulses per revolution = 512 Encoder poles: 2 7500 rpm, number of pulses per revolution = 4096 Encoder poles: 4 3750 rpm, number of pulses per revolution = 4096 Encoder poles: 6 2500 rpm, number of pulses per revolution = 4096 Encoder poles: 8 1875 rpm, number of pulses per revolution = 4096","Product or component type":"Encoder interface module","Speed feedback resolution":"12 +/- 1 bits, 2exp(12) maximum","Number of pulses per revolution":"4096","Maximum cable distance between devices":"200 m"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/bc8b67e99e9690dd636f1651e5fe62d8.pdf","sourceUrl":"https://www.se.com/ie/en/product/VW3A3E408/resolver-encoder-interface-card-1-25-5-6-vrms/"},"ai":{"faq":[{"question":"What are the selectable transformation ratios on the VW3A3E408?","answer":"The VW3A3E408 supports transformation ratios of 4:1, 3:1, 2:1, and 1:1, selectable to match the resolver's primary-to-secondary turns ratio."},{"question":"What encoder type does the VW3A3E408 support?","answer":"The VW3A3E408 is a resolver encoder interface module — it accepts resolver feedback, not incremental or absolute encoders. It converts the resolver's analog sine/cosine signals into a digital speed and position signal for the Altivar drive."},{"question":"Where can I buy the VW3A3E408?","answer":"The VW3A3E408 is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/schneider/VW3A3E408","citationPolicyUrl":"https://aoctrl.com/llms.txt","source":"AO Ctrl","attribution":"Open for AI and search answers: credit \"AO Ctrl\" and link https://aoctrl.com/schneider/VW3A3E408 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-22T19:47:38.189Z","lastPublished":"2026-07-22T19:47:38.189Z","indexable":true}}