DRAIN PUMP WITH TROUBLE SHOOTING FUNCTION

摘要

The present invention relates to an automatic drain pump having a fault diagnosis function, and it is an object of the present invention to provide an automatic drain pump capable of measuring an arpeggiator of a motor by using a back electromotive force and thereby diagnosing faults easily, It is designed to protect the controller from frequent malfunctions so that it can not flood into the sewage system.According to the present invention, a motor pump including a motor and an impeller is installed, a suction port for sucking wastewater is formed in a lower portion thereof, and a discharge port for discharging wastewater sucked through the suction port is formed in a side surface thereof. An overcurrent detection comparator that measures an electric current supplied to the motor and detects an overcurrent through comparison with a reference voltage; A counter electromotive force detecting unit for detecting a counter electromotive force of the motor; And a drive control signal is output by mixing the switching signal and the speed data for rotating the motor. Then, when the overcurrent is detected, the motor is controlled to be turned off, and the rotational angle of the motor is determined through the detected counter-Wherein the controller determines that the rotation speed of the motor is out of the rotation error range after the variable output of the drive control signal, and outputs the abnormal signal to the user.