Answer Posted / venkat iyer
VFD is known as Variable Frequency Drive, and is used in AC Electrical System for varying the speed of a 3 phase squirrel cage induction motor, by varying the output frequency of the drive. The AC voltage is initially converted into DC and the energy / POWER is stored in capacitors which is later inverted through IGBT (insulated gate bypolar transistor)
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Is a contactor (or master relay) required between incoming lines and a VFD? The question goes to safety. If a contactor were used before the VFD and an e-stop engaged then the motor will coast to a stop (i.e. VFD loses power) instead of stopping much faster if the VFD braking fucntion were used. It would make more sense to keep power on the VFD.
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