Danfoss Drives Announces New High Power Series Of Variable Frequency Drives
Danfoss Drives announced that its VLT® series of variable frequency drives are now available with power through 1350 HP in 460 and 690 Vac. F1 frame models deliver power up to 1050 HP in an 86.8 x 55.1 x 23.9" footprint, while F2 frame models deliver up to 1350 HP in an 86.8 x 71.0 x 23.9" footprint.
According to Danfoss, these high power variable frequency drives not only deliver high power performance, they facilitate ease-of-use by sharing a common platform with smaller drives. The company claims that proven power electronics promise reliable operation, and components are accessible from the front of the unit for quick, easy serviceability and maintenance. A Rittal TS8 enclosure system in IP21 (NEMA1) or IP54 (NEMA12) is said to enable easy system expansion, while a Class A1 RFI filter (optional class A2) reduces EMI/RFI without the need for external filters. Additional features include dc-link reactors to reduce harmonics without external ac line reactors, dc-link fuses that provide independent protection of inverters, and coated PCBs provide extra protection in potentially corrosive environments.
High power F frame size VLT Series variable frequency drives also feature what is described as a unique cooling design that utilizes a ducted back channel to pass cooling air over heat sinks, with minimal air passing through the electronics area. This allows 85% of the heat losses to be exhausted directly outside the enclosure, which improves reliability and prolongs drive life by dramatically reducing temperature rise and contamination of electronic components.