Mitsubishi Electric FR-A700 Series, Technical Manual

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2.21.7 USB communication [Pr. 547, 548] (A700) .............................................................................................................................. 473
3 SELECTION 475
3.1 Inverter selection ........................................................................................................................................ 476
3.1.1 Principle and control method of the inverter (common) .......................................................................................................... 476
3.1.2 Rated inverter capacity (common) .......................................................................................................................................... 483
3.1.3 Starting torque and starting current of the motor (common) .................................................................................................. 486
3.1.4 Starting torque boost (common) ............................................................................................................................................. 486
3.1.5 Acceleration/deceleration time of the motor (common) .......................................................................................................... 487
3.1.6 Deceleration characteristic of the inverter (common) ............................................................................................................. 489
3.2 Motor characteristics .................................................................................................................................. 491
3.2.1 Characteristics of the induction motor (common) ................................................................................................................... 491
3.2.2 Torque generated by a motor driven by an inverter (common) ............................................................................................... 491
3.2.3 Continuous motor output characteristic (common) ................................................................................................................. 491
3.2.4 Efficiency (common) ............................................................................................................................................................... 492
3.2.5 Vibration (common) ................................................................................................................................................................. 493
3.3 Operation of various motors ....................................................................................................................... 494
3.3.1 Motor types according to protection structure .......................................................................................................................... 494
3.3.2 Constant-torque motor ............................................................................................................................................................. 494
3.3.3 Low-vibration motor ................................................................................................................................................................. 496
3.3.4 Brake motor ............................................................................................................................................................................. 497
3.3.5 Pole changing motor ................................................................................................................................................................ 497
3.3.6 Submersible motor ................................................................................................................................................................... 497
3.3.7 Explosion-proof motor .............................................................................................................................................................. 498
3.3.8 Vector control dedicated motor ................................................................................................................................................ 501
3.3.9 Geared motor ........................................................................................................................................................................... 503
3.3.10 Synchronous motor .................................................................................................................................................................. 504
3.3.11 Single phase motor .................................................................................................................................................................. 504
3.3.12 Permissible maximum frequency of general-purpose motor .................................................................................................... 504
3.3.13 Inverter-driven 400V motor ...................................................................................................................................................... 504
3.4 Power supply of the inverter ....................................................................................................................... 505
3.4.1 Inverter input current and power factor .................................................................................................................................... 505
3.4.2 Improvement of power factor ................................................................................................................................................... 506
3.4.3 Inrush current ........................................................................................................................................................................... 506
3.4.4 Instantaneous power failure ..................................................................................................................................................... 506
3.4.5 Power supply voltage variation ................................................................................................................................................ 507
3.4.6 Imbalanced power supply voltage ............................................................................................................................................ 507
3.4.7 Coordination with power supply ............................................................................................................................................... 507
3.5 Inverter-generated harmonics, EMI and leakage current .......................................................................... 508
3.5.1 Differences between EMI and harmonics ................................................................................................................................ 508
3.5.2 Power harmonics and their reduction techniques .................................................................................................................... 508
3.5.3 Inverter-generated EMI and their reduction techniques ........................................................................................................... 518
3.5.4 Leakage currents and countermeasures ................................................................................................................................. 524
3.6 Selection of peripheral devices .................................................................................................................. 526
3.6.1 Moulded case circuit breaker ................................................................................................................................................... 528
3.6.2 Magnetic contactor (MC) .......................................................................................................................................................... 529
3.6.3 Thermal relay ........................................................................................................................................................................... 529
3.6.4 Cable size and wiring distance ................................................................................................................................................ 530
3.6.5 Earth leakage circuit breaker (NV) ........................................................................................................................................... 531
3.6.6 Relays ...................................................................................................................................................................................... 533
3.6.7 Start/stop switch ....................................................................................................................................................................... 533
3.6.8 Frequency setting potentiometer ............................................................................................................................................. 534
3.6.9 Frequency meter and calibration resistor ................................................................................................................................. 534