Mitsubishi Electric FR-A760 Series Instruction Manual page 10

5.1 Reset method of protective function ............................................................. 388
5.2 List of fault or alarm display ........................................................................... 389
5.3 Causes and corrective actions ....................................................................... 390
5.4 Correspondences between digital and actual characters ........................... 404
5.5 Check first when you have troubles .............................................................. 405
5.5.1 Motor will not start ................................................................................................................. 405
5.5.2 Motor generates abnormal noise ........................................................................................... 405
5.5.3 Motor generates heat abnormally .......................................................................................... 406
5.5.4 Motor rotates in opposite direction ........................................................................................ 406
5.5.5 Speed greatly differs from the setting .................................................................................... 406
5.5.6 Acceleration/deceleration is not smooth ................................................................................ 406
5.5.7 Motor current is large............................................................................................................. 406
5.5.8 Speed does not increase....................................................................................................... 406
5.5.9 Speed varies during operation............................................................................................... 407
5.5.10 Operation mode is not changed properly .............................................................................. 407
5.5.11 Operation panel (FR-DU07) display is not operating............................................................. 407
5.5.12 POWER lamp is not lit ........................................................................................................... 407
5.5.13 Parameter write cannot be performed ................................................................................... 407
6 PRECAUTIONS FOR MAINTENANCE AND INSPECTION
6.1 Inspection item................................................................................................. 410
6.1.1 Daily inspection ..................................................................................................................... 410
6.1.2 Periodic inspection ................................................................................................................ 410
6.1.3 Daily and periodic inspection ................................................................................................. 411
6.1.4 Display of the life of the inverter parts ................................................................................... 412
6.1.5 Checking the inverter and converter modules ....................................................................... 412
6.1.6 Cleaning ................................................................................................................................ 413
6.1.7 Replacement of parts ............................................................................................................ 413
6.1.8 Inverter replacement.............................................................................................................. 417
6.2 Measurement of main circuit voltages, currents and powers ..................... 418
6.2.1 Measurement of powers ........................................................................................................ 420
6.2.2 Measurement of voltages and use of PT ............................................................................... 420
6.2.3 Measurement of currents....................................................................................................... 421
6.2.4 Use of CT and transducer ..................................................................................................... 421
6.2.5 Measurement of inverter input power factor .......................................................................... 421
6.2.6 Measurement of converter output voltage (across terminals P/+ - N/-) ................................. 422
6.2.7 Measurement of inverter output frequency ............................................................................ 422
6.2.8 Insulation resistance test using megger ................................................................................ 422
409
VII