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VI
5.3 Causes and corrective actions ....................................................................... 310
5.4 Correspondences between digital and actual characters ........................... 322
5.5 Check first when you have a trouble ............................................................. 323
5.5.1 Motor does not start............................................................................................................... 323
5.5.2 Motor or machine is making abnormal acoustic noise........................................................... 325
5.5.3 Inverter generates abnormal noise........................................................................................ 325
5.5.4 Motor generates heat abnormally.......................................................................................... 325
5.5.5 Motor rotates in the opposite direction .................................................................................. 326
5.5.6 Speed greatly differs from the setting.................................................................................... 326
5.5.7 Acceleration/deceleration is not smooth................................................................................ 326
5.5.8 Speed varies during operation............................................................................................... 327
5.5.9 Operation mode is not changed properly .............................................................................. 327
5.5.10 Operation panel (FR-DU07) display is not operating............................................................. 328
5.5.11 Motor current is too large....................................................................................................... 328
5.5.12 Speed does not accelerate.................................................................................................... 329
5.5.13 Unable to write parameter setting.......................................................................................... 329
5.5.14 Power lamp is not lit .............................................................................................................. 329
6 PRECAUTIONS FOR MAINTENANCE AND INSPECTION 331
6.1 Inspection item................................................................................................. 332
6.1.1 Daily inspection ..................................................................................................................... 332
6.1.2 Periodic inspection ................................................................................................................ 332
6.1.3 Daily and periodic inspection................................................................................................. 333
6.1.4 Display of the life of the inverter parts ................................................................................... 334
6.1.5 Checking the inverter and converter modules ....................................................................... 334
6.1.6 Cleaning ................................................................................................................................ 335
6.1.7 Replacement of parts ............................................................................................................ 335
6.1.8 Inverter replacement.............................................................................................................. 339
6.2 Measurement of main circuit voltages, currents and powers ..................... 340
6.2.1 Measurement of powers ........................................................................................................ 342
6.2.2 Measurement of voltages and use of PT............................................................................... 342
6.2.3 Measurement of currents....................................................................................................... 343
6.2.4 Use of CT and transducer ..................................................................................................... 343
6.2.5 Measurement of inverter input power factor .......................................................................... 343
6.2.6 Measurement of converter output voltage (across terminals P/+ and N/-) ............................ 344
6.2.7 Measurement of inverter output frequency............................................................................ 344
6.2.8 Insulation resistance test using megger ................................................................................ 344
6.2.9 Pressure test ......................................................................................................................... 344
7 SPECIFICATIONS 345
7.1 Rating................................................................................................................ 346