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III
CONTENTS
5 TROUBLESHOOTING 141
5.1 Reset method of protective function .................................................................. 141
5.2 List of fault or alarm display ............................................................................... 142
5.3 Causes and corrective actions........................................................................... 143
5.4 Correspondences between digital and actual characters .................................. 159
5.5 Check and clear of the faults history.................................................................. 160
5.6 Check first when you have a trouble.................................................................. 162
5.6.1 Motor does not start............................................................................................................... 162
5.6.2 Motor or machine is making abnormal acoustic noise........................................................... 164
5.6.3 Inverter generates abnormal noise........................................................................................ 164
5.6.4 Motor generates heat abnormally.......................................................................................... 165
5.6.5 Motor rotates in the opposite direction .................................................................................. 165
5.6.6 Speed greatly differs from the setting.................................................................................... 165
5.6.7 Acceleration/deceleration is not smooth................................................................................ 166
5.6.8 Motor current is too large....................................................................................................... 166
5.6.9 Speed does not accelerate.................................................................................................... 167
5.6.10 Motor and machine vibrate .................................................................................................... 167
5.6.11 Speed varies during operation............................................................................................... 168
5.6.12 Operation mode is not changed properly .............................................................................. 169
5.6.13 Operation panel (FR-DU07) display is not operating............................................................. 169
5.6.14 Power lamp is not lit .............................................................................................................. 169
5.6.15 Unable to write parameter setting.......................................................................................... 169
6 PRECAUTIONS FOR MAINTENANCE AND INSPECTION 170
6.1 Inspection item................................................................................................... 170
6.1.1 Daily inspection ..................................................................................................................... 170
6.1.2 Periodic inspection ................................................................................................................ 170
6.1.3 Daily and periodic inspection................................................................................................. 171
6.1.4 Display of the life of the inverter parts ................................................................................... 172
6.1.5 Checking the inverter and converter modules ....................................................................... 173
6.1.6 Cleaning ................................................................................................................................ 174
6.1.7 Replacement of parts ............................................................................................................ 174
6.2 Measurement of main circuit voltages, currents and powers............................. 177
6.2.1 Measurement of powers ........................................................................................................ 179
6.2.2 Measurement of voltages and use of PT............................................................................... 179
6.2.3 Measurement of currents....................................................................................................... 180
6.2.4 Use of CT and transducer ..................................................................................................... 180
6.2.5 Measurement of inverter input power factor .......................................................................... 180
6.2.6 Measurement of converter output voltage (across terminals P/+ and N/-) ............................ 181
6.2.7 Measurement of inverter output frequency............................................................................ 181
6.2.8 Insulation resistance test using megger ................................................................................ 181
6.2.9 Pressure test ......................................................................................................................... 181