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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
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
7.1
Rating................................................................................................................ 346
VI
331
345
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