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Modern industries are installed with an adjustable speed drive (ASD), which is more sensitive to power quality
issues. The most common reason for the tripping of ASD is the voltage sag. Hence, the impact of various types
of sags on the performance of ASD is presented in this paper. The basic topology of ASD fed by uncontrolled
rectifier is presented in this paper. Different types of voltage sags occurred at point of common coupling with
their causes are also discussed. To study the impact of voltage sag on ASD, a simulation is carried out using
MATLAB software and the performance of ASD is tested under unsymmetrical voltage sag, symmetrical
voltage sag and voltage sag with phase angle shift.