Motor-driven rotating machinery has been used in various industrial applications, but the maintenance of such machines has been time-based inspection in many cases. A vibration meter is generally used to diagnose the condition of rotating machinery, which requires the installation of sensors, cable work, etc., on site, resulting in increased costs. Mitsubishi Hitachi Power Systems Ltd. (MHPS) developed a motor-driven equipment diagnostics system, which diagnoses the condition of rotating machinery and motors through a simple system in which a clamp-type current sensor is installed on the power cable for driving the motor and furthermore presents diagnosis predictions (of one year later). With this system, persons in charge of maintenance can easily plan the maintenance of rotating machinery and motors with quantified indicators based on the results of diagnosis predictions, and excessive maintenance costs can be reduced.
