Mitsubishi Electric FR-D720-070 Instruction Manual page 10

4.22 Setting the parameter unit and operation panel........................... 237
4.22.1 RUN key rotation direction selection (Pr. 40)............................................................................. 237
4.22.2 PU display language selection(Pr.145)...................................................................................... 237
4.22.3 Operation panel frequency setting/key lock operation selection (Pr. 161)................................. 238
4.22.4 Magnitude of frequency change setting (Pr. 295)...................................................................... 240
4.22.5 Buzzer control (Pr. 990)............................................................................................................. 241
4.22.6 PU contrast adjustment (Pr. 991) .............................................................................................. 241
4.23 Parameter clear/ All parameter clear ............................................ 242
4.24 Initial value change list ................................................................. 243
4.25 Check and clear of the faults history ............................................ 244
5 TROUBLESHOOTING
5.1 Reset method of protective function.............................................. 248
5.2 List of fault or alarm indications .................................................... 249
5.3 Causes and corrective actions ....................................................... 250
5.4 Correspondences between digital and actual characters............. 259
5.5 Check first when you have some troubles ..................................... 260
5.5.1 Motor will not start....................................................................................................................... 260
5.5.2 Motor generates abnormal noise ................................................................................................ 260
5.5.3 Motor generates heat abnormally ............................................................................................... 261
5.5.4 Motor rotates in opposite direction.............................................................................................. 261
5.5.5 Speed greatly differs from the setting ......................................................................................... 261
5.5.6 Acceleration/deceleration is not smooth ..................................................................................... 261
5.5.7 Motor current is large.................................................................................................................. 261
5.5.8 Speed does not increase ............................................................................................................ 261
5.5.9 Speed varies during operation.................................................................................................... 262
5.5.10 Operation mode is not changed properly.................................................................................... 262
5.5.11 Operation panel display is not operating .................................................................................... 262
5.5.12 Parameter write cannot be performed ........................................................................................ 262
6 PRECAUTIONS FOR MAINTENANCE AND INSPECTION
6.1 Inspection items ............................................................................. 264
6.1.1 Daily inspection........................................................................................................................... 264
6.1.2 Periodic inspection...................................................................................................................... 264
6.1.3 Daily and periodic inspection ...................................................................................................... 265
6.1.4 Display of the life of the inverter parts ........................................................................................ 266
6.1.5 Checking the inverter and converter modules ............................................................................ 266
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