Abstract
Variable speed drive (VSD) is used not only for controlling the speed but also for saving the electric energyconsumption. In this research VSD is applied to 3 phase squirrel cage induction motor used for water pumping inthe industry. VSD is needed to be applied to induction motors because these motors are the largest electricconsumed. Measurement and calculation are performed in the two conditions, before and after attaching VSD inthe motor. Electric quantities are obtained by measurement in the input and in the output of VSD. While energyconsumption and consumption cost are obtained by calculation. Finally, calculation of energy saving and costsaving are perfomed by comparing those two conditions. Aplication of VSD in the induction motor has advantagesfor saving electric energy consumption dan making it last longer. The energy saving and cost saving per year result1.003.984,8 kWh and IDR 732.908.904 respectlively. The longer life is caused by reduction of energy consumption.
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