• Danfoss Industries Private Limited

Drives

Danfoss Industries offers VLT 12-Pulse Drives. When reduced harmonics and increased network stability are desired for high power applications, the Danfoss VLT 12-pulse drive offers an excellent solution. Two standard 6-pulse rectifiers are connected in parallel to a three-phase system, through a 30º phase shifting transformer. By phase shifting the secondary windings, the sum of the secondary currents in the primary eliminates the 5th, 7th, 17th and 19th harmonics. This results in a ThiD of approx 10% compared with a ThiD of 30% to 50% in a 6-pulse drive with coil mitigation. The Danfoss VLT-12-pulse drive provides harmonic reduction without adding capacitive, inductive or resistive components, which often require extensive network analysis to avoid potential system resonance problems. The VLT 12-pulse is a high efficiency variable frequency converter, which is built with the same modular design as the popular 6-pulse high power drives which provide exceptional flexibility, durability and reliability in demanding industry applications. Power range: 250 kW-1.4 MW; voltage range – 380-690 V; enclosure – IP 21/NEMA type 1, IP 54/Nema type 12; and drive platform – VLT HVAC drive FC 102, VLT Aqua drive FC 202, VLT automation drive FC 302. The perfect solution for soft power grids, reducing network harmonic distortion, generator powered installations, step down, step up applications, drives to be isolated from the grid. Assists in meeting harmonic standards: IEEE-519 1992, EN 61000-2-4, G5/4.