A unique "back-channel cooling" system separates the cooling air and helps solve the heat loss problem by taking air from the outside of the control room and exhausting it back outside. The majority of the cooling air and 85% of the heat losses are passed to the outside of the control room reducing cooling costs. Furthermore, this cooling air only passes over heat sink surfaces and is not seen by the internal electronic components of the drive. This keeps a significant amount of contaminants outside of the drive resulting in extended life and reliability.
Heat gain inside the control room is therefore only 0.30% of the drive power rating, and excess heat from a 450 kW drive will be only 1350 W - corresponding to the heat from only 23 light bulbs.