Mitsubishi Electric FR-A720-0.4K Instruction Manual page 8

4.23.2 Operation mode at power on (Pr. 79, Pr. 340) ..................................................................... 306
4.23.3 Operation command source and speed command source during
communication operation (Pr. 338, Pr. 339, Pr. 550, Pr. 551).............................................. 307
4.24 Communication operation and setting ......................................................... 312
4.24.1 Wiring and configuration of PU connector ............................................................................ 312
4.24.2 Wiring and arrangement of RS-485 terminals ...................................................................... 314
4.24.3 Initial settings and specifications of RS-485 communication
(Pr. 117 to Pr. 124, Pr. 331 to Pr. 337, Pr. 341, Pr. 549)...................................................... 317
4.24.4 Communication EEPROM write selection (Pr. 342) ............................................................. 318
4.24.5 Mitsubishi inverter protocol (computer link communication) ................................................. 319
4.24.6 Modbus-RTU communication specifications (Pr. 331, Pr. 332, Pr. 334, Pr. 343,
Pr. 539, Pr. 549) ................................................................................................................... 330
4.24.7 USB communication (Pr. 547, Pr. 548) ................................................................................ 343
4.25 Special operation and frequency control ..................................................... 344
4.25.1 PID control (Pr. 127 to Pr. 134, Pr. 575 to Pr. 577) .............................................................. 344
4.25.2 Bypass-inverter switchover function (Pr. 57, Pr. 58, Pr. 135 to Pr. 139, Pr. 159)................. 352
4.25.3 Load torque high speed frequency control (Pr. 4, Pr. 5, Pr. 270 to Pr. 274) ........................ 357
4.25.4 Droop control (Pr. 286 to Pr. 288)
4.25.5 Frequency setting by pulse train input (Pr. 291, Pr. 384 to Pr. 386)..................................... 361
4.25.6 Encoder feedback control (Pr. 144, Pr. 285, Pr. 359, Pr. 367 to Pr. 369) ........................... 364
4.25.7 Regeneration avoidance function (Pr. 665, Pr. 882 to Pr. 886) ............................................ 366
4.26 Useful functions .............................................................................................. 368
4.26.1 Cooling fan operation selection (Pr. 244) ............................................................................. 368
4.26.2 Display of the life of the inverter parts (Pr. 255 to Pr. 259)................................................... 369
4.26.3 Maintenance timer alarm (Pr. 503, Pr. 504) ......................................................................... 372
4.26.4 Current average value monitor signal (Pr. 555 to Pr. 557) ................................................... 373
4.26.5 Free parameter (Pr. 888, Pr. 889) ........................................................................................ 375
4.27 Setting of the parameter unit and operation panel ...................................... 376
4.27.1 PU display language selection (Pr. 145) .............................................................................. 376
4.27.2 Operation panel frequency setting/key lock operation selection (Pr. 161) ........................... 376
4.27.3 Buzzer control (Pr. 990)........................................................................................................ 378
4.27.4 PU contrast adjustment (Pr. 991) ......................................................................................... 378
4.28 Parameter clear ............................................................................................... 379
4.29 All parameter clear.......................................................................................... 380
4.30 Parameter copy and parameter verification ................................................. 381
4.30.1 Parameter copy .................................................................................................................... 381
4.30.2 Parameter verification........................................................................................................... 382
..................................................................................... 359
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