Mitsubishi Electric FR-D720-008 Instruction Manual page 9

4.21.3 Maintenance timer alarm (Pr. 503, Pr. 504)............................................................................... 231
4.21.4 Current average value monitor signal (Pr. 555 to Pr. 557) ........................................................ 232
4.21.5 Free parameter (Pr. 888, Pr. 889) ............................................................................................. 234
4.22 Setting the parameter unit and operation panel........................... 235
4.22.1 RUN key rotation direction selection (Pr. 40)............................................................................. 235
4.22.2 PU display language selection(Pr.145)...................................................................................... 235
4.22.3 Operation panel frequency setting/key lock operation selection (Pr. 161)................................. 236
4.22.4 Magnitude of frequency change setting (Pr. 295)...................................................................... 238
4.22.5 Buzzer control (Pr. 990)............................................................................................................. 239
4.22.6 PU contrast adjustment (Pr. 991) .............................................................................................. 239
4.23 Parameter clear/ All parameter clear ............................................ 240
4.24 Initial value change list ................................................................. 241
4.25 Check and clear of the faults history ............................................ 242
5 TROUBLESHOOTING
5.1 Reset method of protective function.............................................. 246
5.2 List of fault or alarm indications .................................................... 247
5.3 Causes and corrective actions ....................................................... 248
5.4 Correspondences between digital and actual characters............. 257
5.5 Check first when you have some troubles ..................................... 258
5.5.1 Motor does not start.................................................................................................................... 258
5.5.2 Motor or machine is making abnormal acoustic noise................................................................ 260
5.5.3 Inverter generates abnormal noise ............................................................................................. 261
5.5.4 Motor generates heat abnormally ............................................................................................... 261
5.5.5 Motor rotates in the opposite direction........................................................................................ 261
5.5.6 Speed greatly differs from the setting ......................................................................................... 261
5.5.7 Acceleration/deceleration is not smooth ..................................................................................... 262
5.5.8 Speed varies during operation.................................................................................................... 262
5.5.9 Operation mode is not changed properly.................................................................................... 263
5.5.10 Operation panel display is not operating .................................................................................... 263
5.5.11 Motor current is too large............................................................................................................ 263
5.5.12 Speed does not accelerate ......................................................................................................... 264
5.5.13 Unable to write parameter setting............................................................................................... 264
6 PRECAUTIONS FOR MAINTENANCE AND INSPECTION
6.1 Inspection items ............................................................................. 266
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