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CONTENTS
3 PRECAUTIONS FOR USE OF THE INVERTER 59
3.1 Electro-magnetic interference (EMI) and leakage currents 60
3.1.1 Leakage currents and countermeasures........................................................................................................ 60
3.1.2 Countermeasures against inverter-generated EMI ........................................................................................63
3.1.3 Converter unit (FR-CC2) built-in EMC filter.................................................................................................... 66
3.2 Power supply harmonics 67
3.2.1 Power supply harmonics................................................................................................................................67
3.2.2 Harmonic Suppression Guidelines in Japan .................................................................................................. 68
3.3 Installation of a reactor 70
3.4 Power-OFF and magnetic contactor (MC) 71
3.5 Countermeasures against deterioration of the 400 V class motor insulation 72
3.6 Checklist before starting operation 73
3.7 Failsafe system which uses the inverter 76
4 PROTECTIVE FUNCTIONS 79
4.1 Inverter fault and alarm indications 80
4.2 Reset method for the protective functions 80
4.3 Check and clear of the faults history 81
4.4 List of fault displays 83
5 PRECAUTIONS FOR
MAINTENANCE AND INSPECTION 85
5.1 Inspection item 86
5.1.1 Daily inspection ..............................................................................................................................................86
5.1.2 Periodic inspection ......................................................................................................................................... 86
5.1.3 Daily and periodic inspection.......................................................................................................................... 87
5.1.4 Checking the inverter and converter modules................................................................................................88
5.1.5 Cleaning .........................................................................................................................................................89
5.1.6 Replacement of parts .....................................................................................................................................89
5.1.7 Inverter replacement ......................................................................................................................................91
5.2 Measurement of main circuit voltages, currents and powers 92
5.2.1 Measurement of powers................................................................................................................................. 94
5.2.2 Measurement of voltages and use of PT........................................................................................................94
5.2.3 Measurement of currents ............................................................................................................................... 95
5.2.4 Use of CT and transducer ..............................................................................................................................95
5.2.5 Example of measuring converter unit (FR-CC2) input power factor...............................................................95
5.2.6 Measurement of converter output voltage (across terminals P and N) ..........................................................95
5.2.7 Measurement of inverter output frequency.....................................................................................................96