Case note ACS 1000 variable speed drives improve efficiency of power and district heating plant Mälarenergi replaced resistors and slip- ring motors, which controlled district heating pumps, with four ACS 1000 variable speed drive systems (each rated at 1765 kW (2365 hp)). Thus, the heat losses caused by the flow control method were reduced considerably and the production of electrical energy was increased by about 35 GWh per year. Backg

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