Product Description:

The 175L1020 variable speed drive is produced by Danfoss as part of the VLT 3000 Variable Speed Drives series. Installed between the line supply and a three-phase induction motor, it converts a fixed 440 to 500 V AC input into a controlled output that lets motor speed match process demand, reduce energy use, and provide gentle ramp-up or ramp-down sequences in automated machinery. It is intended for variable-speed duty in fans, pumps, conveyors, and similar industrial equipment where operating conditions change during use. This arrangement gives the connected motor adjustable speed control without the abrupt starting behavior of direct-on-line operation.

During load transients, the drive can deliver an apparent output of 4.7 kVA for up to 60 seconds, giving short-term torque support when starting heavier rotating loads. When demand stabilizes, it sustains 2.9 kVA continuously. Corresponding current capability is 5.5 A in the 60-second cycle and 3.4 A under steady conditions, allowing acceleration without nuisance trips. Full-load efficiency reaches 96 %, which helps limit heat buildup inside the enclosure. The input section accepts a three-phase 440/460/500 V AC network at 50 or 60 Hz, rectifies it, and feeds the inverter bridge that produces the variable-frequency output.

The drive supports motors up to 3 HP, while its own nominal rating is 2 HP. Upstream protection should be coordinated with a 15 A pre-fuse so the input rectifier remains within its surge withstand level. Field wiring can be terminated with copper conductors up to 12 AWG, matching common industrial cable sizes and helping keep voltage drop within recommended limits across typical motor lead lengths. With this wiring and protection arrangement, the unit fits into control panels that also contain contactors, filters, and fieldbus gateways.