ANALYSIS OF THE WORKING OF VARIABLE FREQUENCY DRIVE (VFD) ON THE MOTOR HOIST CRANE IN AN ELECTRIC SYSTEM TO DAMPEN SWING

Abstract

This study aims to analyze the performance of Variable Frequency Drive (VFD) on three-phase crane hoist motors in reducing load swings and improving energy efficiency. The method used was a laboratory experiment with a quantitative approach, using frequency variations of 30 Hz, 40 Hz, and 50 Hz. Data was obtained through a digital gyroscope sensor and recording of current and voltage in real time. The test results show that the 40 Hz frequency provides optimal performance with good swing damping and the highest energy efficiency. VFD has been proven to be able to reduce impulsive forces during starting and stopping, shorten damping time, and reduce electrical power consumption. In addition, the use of VFD also reduces the Total Harmonic Distortion (THD) value to below 5%, according to the IEEE-519 standard. These findings confirm that the integration of VFD in the hoist crane system not only improves operational stability, but also supports energy efficiency and work safety.