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CONTENTS
4.20.1 Wiring and configuration of PU connector ............................................................................ 224
4.20.2 Wiring and configuration of RS-485 terminals ...................................................................... 226
4.20.3 Initial settings and specifications of RS-485 communication
(Pr. 117 to Pr. 124, Pr. 331 to Pr. 337, Pr. 341, Pr. 549)...................................................... 229
4.20.4 Communication EEPROM write selection (Pr. 342) ............................................................. 230
4.20.5 Operation selection at communication error (Pr.502, Pr.779) .............................................. 231
4.20.6 Mitsubishi inverter protocol (computer link communication)................................................. 234
4.20.7 Modbus-RTU communication specifications
(Pr. 331, Pr. 332, Pr. 334, Pr. 343, Pr. 539, Pr. 549, Pr. 779) .............................................. 247
4.21 Special operation and frequency control ..................................................... 261
4.21.1 PID control (Pr. 127 to Pr. 134, Pr. 241, Pr. 553, Pr. 554, Pr. 575 to Pr. 577,
C42 (Pr. 934) to C45 (Pr. 935)) ............................................................................................ 261
4.21.2 Bypass-inverter switchover function (pr. 57, Pr. 58, Pr. 135 to Pr. 139, Pr. 159)
<V/F><S MFVC> .................................................................................................................. 274
4.21.3 Regeneration avoidance function (Pr. 665, Pr. 882 to Pr. 886)............................................ 279
4.22 Useful functions.............................................................................................. 281
4.22.1 Cooling fan operation selection (Pr. 244) ............................................................................. 281
4.22.2 Display of the life of the inverter parts (Pr. 255 to Pr .259)................................................... 282
4.22.3 Maintenance timer alarm (Pr. 503, Pr. 504) ......................................................................... 285
4.22.4 Current average value monitor signal (Pr. 555 to Pr. 557) ................................................... 286
4.22.5 Free parameter (Pr. 888, Pr. 889) ........................................................................................ 288
4.22.6 Initiating a fault (Pr.997) ....................................................................................................... 289
4.22.7 Setting multiple parameters as a batch (Pr.999) .................................................................. 290
4.23 Setting from the parameter unit, operation panel........................................ 295
4.23.1 PU display language selection (Pr. 145) .............................................................................. 295
4.23.2 Setting dial potentiometer mode/key lock selection (Pr. 161)............................................... 295
4.23.3 Buzzer control (Pr. 990)........................................................................................................ 298
4.23.4 PU contrast adjustment (Pr. 991) ......................................................................................... 298
4.24 Parameter clear ............................................................................................... 299
4.25 All parameter clear.......................................................................................... 300
4.26 Parameter copy and parameter verification ................................................. 301
4.26.1 Parameter copy .................................................................................................................... 301
4.26.2 Parameter verification........................................................................................................... 302
4.27 Initial value change list................................................................................... 303
4.28 Check and clear of the faults history ............................................................ 304
5 PROTECTIVE FUNCTIONS 307
5.1 Reset method of protective function ............................................................. 308
5.2 List of fault or alarm display ........................................................................... 309