175L3715 by Danfoss

The 175L3715 is an AC variable speed drive manufactured by Danfoss for the VLT 3000 Variable Speed Drives series. As a closed-loop controller, it modulates the voltage and frequency supplied to an induction motor so production lines, pumps, or fans can match process demand instead of running at a constant speed. That regulation improves energy utilization and reduces mechanical wear in industrial automation cells.

This model delivers an apparent power of 83 kVA, a figure that combines real and reactive components to size upstream transformers and cables. Under full load it reaches an overall efficiency of 96%, meaning only four percent of the input power is lost as heat. The housing carries an IP54 (NEMA 12) rating, so dust ingress is limited and splashing water cannot reach live parts, allowing cabinet-free wall mounting in most plant areas. Line conductors may draw up to 94.4 A when the inverter is supplying its rated output power of 75 HP. Internally, the inverter can synthesize output frequencies up to 120 Hz, supporting oversynchronous motor operation when higher shaft speeds are required. The cooling rib dissipates 1074 W while the front section releases an additional 529 W, figures that guide panel ventilation design.

For circuit protection, the mains side should be equipped with a fuse not exceeding 150 A. During continuous duty, the inverter supplies a motor phase current of 96 A, yet it tolerates an overload of 106 A for sixty seconds, allowing short acceleration peaks without tripping. Because the power stage must discharge its DC bus between restarts, the control terminals permit only one start command per minute. The stated power losses and current limits help determine the enclosure airflow and cable gauge needed to maintain safe operating temperatures.