Once the above are checked, make the connections as shown below Case 1: Star Connection (For Motors of 2 HP & Below) Case 2: Delta Connection (For Motors of 3 HP & Above) Case 3: Star Connection (For Motors of 10 HP & Above) Remove all Shorting Links and connect Star-Delta Starter Precautions to be […]
Single phasing is a power supply-related fault, wherein the supply to one of the phases is cut-off. The motor will continue to run in 2 phases with vibrations at reduced speed. As the windings connected to 2 phases draw a very high current, this will damage the windings if the protection circuit does not work. […]
Over 40% of all electrical energy consumed in India is used by electric motors. Thus improving the efficiency of electric motors and the driven equipment can save energy, reduce operating costs and improve our nation’s productivity to be competitive in the world market. WHEN SHOULD YOU CONSIDER BUYING AN ENERGY-EFFICIENT MOTOR Any new installation. Expansions/ […]
More than 60% of the electric motors operating in India are in the IE1 category. With the developments in efficiency standards from IE1 to IE4, it is worthwhile to look at the cost-benefit analysis of all the existing motors operating in the plant. In Motors, we should consider the total lifetime cost rather than just the […]
Normal motors are designed to operate on a fundamental frequency of 50 Hz. The high switching frequency of the IGBT transistors employed in modern variable frequency drives (VFDs) may degrade the motor insulation system, cause rise in temperature and hence reduce the motor lifetime. To safeguard the motor from the adverse effects of VFDs, it would be […]