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VI
5.4 Correspondences between digital and actual characters............................346
5.5 Check first when you have a trouble..............................................................347
5.5.1 Motor does not start............................................................................................................... 347
5.5.2 Motor or machine is making abnormal acoustic noise........................................................... 349
5.5.3 Inverter generates abnormal noise........................................................................................ 349
5.5.4 Motor generates heat abnormally.......................................................................................... 349
5.5.5 Motor rotates in the opposite direction................................................................................... 350
5.5.6 Speed greatly differs from the setting.................................................................................... 350
5.5.7 Acceleration/deceleration is not smooth................................................................................ 350
5.5.8 Speed varies during operation............................................................................................... 351
5.5.9 Operation mode is not changed properly............................................................................... 351
5.5.10 Operation panel (FR-DU07) display is not operating............................................................. 352
5.5.11 Motor current is too large....................................................................................................... 352
5.5.12 Speed does not accelerate .................................................................................................... 353
5.5.13 Unable to write parameter setting.......................................................................................... 353
5.5.14 Power lamp is not lit............................................................................................................... 353
6 PRECAUTIONS FOR MAINTENANCE AND INSPECTION 355
6.1 Inspection item .................................................................................................356
6.1.1 Daily inspection...................................................................................................................... 356
6.1.2 Periodic inspection................................................................................................................. 356
6.1.3 Daily and periodic inspection ................................................................................................. 357
6.1.4 Display of the life of the inverter parts ................................................................................... 358
6.1.5 Checking the inverter and converter modules ....................................................................... 358
6.1.6 Cleaning................................................................................................................................. 358
6.1.7 Replacement of parts............................................................................................................. 359
6.1.8 Inverter replacement.............................................................................................................. 362
6.2 Measurement of main circuit voltages, currents and powers......................363
6.2.1 Measurement of voltages and currents ................................................................................. 363
6.2.2 Measurement of powers ........................................................................................................ 365
6.2.3 Measurement of voltages and use of PT ............................................................................... 365
6.2.4 Measurement of currents....................................................................................................... 366
6.2.5 Use of CT and transducer...................................................................................................... 366
6.2.6 Measurement of inverter input power factor .......................................................................... 366
6.2.7 Measurement of converter output voltage (across terminals P/+ and N/-) .......................... 367
6.2.8 Insulation resistance test using megger ................................................................................ 367
6.2.9 Pressure test.......................................................................................................................... 367
7 SPECIFICATIONS 369
7.1 Rating ................................................................................................................370
7.2 Common specifications...................................................................................372