Motor driving apparatus easily analyzable for cause of fault

A motor driving apparatus comprising:

• a converter converting AC power into DC power;
• an inverter converting the DC power output from said converter into frequency variable three-phase AC power for supply to a motor;
• a controller controlling said converter and said inverter;
• an input power supply detection unit detecting at least one of a current in each phase and voltage in each phase of said AC power;
• a power supply monitoring unit storing the most recent data detected by said input power supply detection unit for a predetermined period of time;
• and
• a recording unit which saves said data from said power supply monitoring unit for output at a later time, when a fault has occurred in at least one of said converter, said inverter, and said controller.