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...............................................................................................35 1
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.......................................................................................................36 6
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