The SHMi-DN series medium and high voltage solid-state soit starter devices are new high-tech electrical equipment designed based on the third-generation digitmicroprocessor control technoloey and modern power electronics contoltechnoloey, Thev are special eauioment dedicated to providing solt starting for mediuiand high voltage large motors and can offer the best step-down current-limiting soft starting mode for motors.To adaot to diferent load conditions and achieve betterstarting efect, the sHMy-DN has been desined with a vaiety of controlfunctions, As a result, it can smoaccelerate the startine processwith the minimum curent required for startingthe motor, Therefore. it efectively reduces the voltape drop ofthe power grid durinstarting and weakensthe curent and mechanicalimpacts during stating.When soft stoppingis required, it can provide a smoothly decreasing controllable voltagthe motor,enabling the motor drive system to stop smoothly