Mitsubishi Electric FR-D720 K Series Instruction Manual page 8

4.21.5 Free parameter (Pr. 888, Pr. 889) ............................................................................................. 237
4.22 Setting the parameter unit and operation panel ........................... 238
4.22.1 RUN key rotation direction selection (Pr. 40) ............................................................................ 238
4.22.2 PU display language selection (Pr. 145) ................................................................................... 238
4.22.3 Operation panel frequency setting/key lock selection (Pr. 161) ................................................ 239
4.22.4 Magnitude of frequency change setting (Pr. 295)...................................................................... 241
4.22.5 Buzzer control (Pr. 990)............................................................................................................. 242
4.22.6 PU contrast adjustment (Pr. 991) .............................................................................................. 242
4.23 FR-E500 series operation panel (PA02) setting............................. 243
4.23.1 Built-in potentiometer switching (Pr. 146) .................................................................................. 243
4.23.2 Bias and gain of the built-in frequency setting potentiometer
(C22 (Pr. 922) to C25 (Pr. 923)) ................................................................................................ 244
4.24 Parameter clear/ All parameter clear ............................................ 250
4.25 Initial value change list.................................................................. 251
4.26 Check and clear of the fault history .............................................. 252
5 TROUBLESHOOTING
5.1 Reset method of protective function .............................................. 256
5.2 List of fault or alarm indications..................................................... 257
5.3 Causes and corrective actions ....................................................... 258
5.4 Correspondences between digital and actual characters ............. 267
5.5 Check first when you have a trouble .............................................. 268
5.5.1 Motor does not start.................................................................................................................... 268
5.5.2 Motor or machine is making abnormal acoustic noise................................................................ 270
5.5.3 Inverter generates abnormal noise............................................................................................. 271
5.5.4 Motor generates heat abnormally............................................................................................... 271
5.5.5 Motor rotates in the opposite direction ....................................................................................... 271
5.5.6 Speed greatly differs from the setting......................................................................................... 271
5.5.7 Acceleration/deceleration is not smooth..................................................................................... 272
5.5.8 Speed varies during operation.................................................................................................... 272
5.5.9 Operation mode is not changed properly ................................................................................... 273
5.5.10 Operation panel display is not operating .................................................................................... 273
5.5.11 Motor current is too large............................................................................................................ 273
5.5.12 Speed does not accelerate......................................................................................................... 274
5.5.13 Unable to write parameter setting............................................................................................... 274
6 PRECAUTIONS FOR MAINTENANCE AND INSPECTION
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