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A Variable Frequency Drive (VFD) is a type of motor controller that drives an electric motor by varying the frequency and voltage supplied to the electric motor. Other names for a VFD are variable speed drive, adjustable …...An electrical interlock prevents a restart before the electrodes return to the initial maximum resistance position. If a power failure occurs during starting, the electrodes return automatically to the start position when the supply is restored, so that a new start is possible. ... (control of the slip for the ball mills for example). Why using ...
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