Motor Controller

Primary cause of motor failure is excessive heating, which is sustained over long time periods will result in motor burn out. Overheating also reduces the life of motor. If a motor is continuously overheated by just 10 degrees, its life can get reduced by almost 50%. Overheating normally occurs due to Over Current, which in turn may be due to over load condition or low voltage or phase failure or phase unbalance. Current unbalance in motor is best represented by the presence of excessive negative sequence components in the motor current. Consequently it is necessary to protect motors against negative sequence. Considering the above details, it can be easily concluded that a Motor Protection Unit (MPU) will provide an effective protection to the motor as it is equipped to measure the negative sequence component level in the motor feeder.