Diagnostic apparatus, diagnostic method and rotating machine system for rotating machine

摘要

Provided is a diagnosis device that is capable of separating and detecting, from the total amount of electric current in a plurality of rotary machines for conveying objects, an anomaly in the respective rotary machines. The diagnosis device is provided with: a current sensor that measures the total amount of load current in the rotary machines; a diagnosis unit that makes a diagnosis of the rotary machines on the basis of information from the current sensor; and a display unit that displays the result of the diagnosis carried out by the diagnosis unit, wherein the total amount of load current is measured during a period in which the number of rotary machines having load of an object applied thereto increases or decreases at a roughly constant rate, an increase amount of the load current of each of the rotary machines during when the object is conveyed is extracted from the increase or decrease, and an anomaly is detected on the basis of any difference in the increase amount from the normal state.