Motor driving apparatus easily analyzable for cause of fault

Abstract

Disclosed is a motor driving apparatus in which provisions are made so as to easily isolate the cause of a fault in the event of the occurrence thereof. The voltage and current in each phase of the AC power being supplied to a converter are detected, and the most recently detected data are stored in a power supply monitoring unit for a predetermined period of time. If an alarm occurs in the converter, inverter, or controller, the data currently held in the power supply monitoring unit are recorded in a recording unit. By displaying the thus recorded data, one can easily identify whether the cause of the alarm is due to the power supply or the motor driving apparatus itself.

Description

technical field [0001] The present invention relates to a motor drive device capable of easily distinguishing whether the cause is an input power supply or the device itself when an abnormality occurs. Background technique [0002] In motor control devices that drive machine tools, industrial machinery, robots, etc., the AC power input to the conversion unit that converts AC input power into DC power is originally a balanced three-phase AC, and the conversion from DC to AC can usually be performed without any problems. transformation. [0003] However, the power supply sometimes has a momentary drop in voltage or breaks the three-phase balance state due to the operating conditions of other connected devices or the influence of the power supply itself from the power company (that is, external factors). [0004] At this time, an internal abnormality is detected on the converter side, the inverter side, or a controller that has issued a command to the motor depending on the si...

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Problems solved by technology

But there is no record about the input power

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