APPENDICES
Contents
Appendix A Trouble-free Use of Inverters (Notes on Electrical Noise) ······································ 1
A.1 Effect of inverters on other devices ·································································· 1
[ 1 ] Effect on AM radios ······················································································ 1
[ 2 ] Effect on telephones ····················································································· 1
[ 3 ] Effect on pressure sensors ············································································· 1
[ 4 ] Effect on position detectors (pulse encoders) ····················································· 1
[ 5 ] Effect on proximity switches ··········································································· 1
A.2 Noise ········································································································· 2
[ 1 ] Inverter Operating Principle and Noise ······························································ 2
[ 2 ] Types of noise ····························································································· 3
A.3 Measure ····································································································· 5
[ 1 ] Noise prevention prior to installation ································································· 5
[ 2 ] Implementation of noise prevention measures ···················································· 6
[ 3 ] Noise prevention examples ············································································ 9
Appendix B Japanese Guideline for Suppressing Harmonics by Customers Receiving
High Voltage or Special High Voltage (General-purpose Inverters) ························ 13
B.1 Application of general-purpose inverters ·························································· 13
[ 1 ] Application for Other Than Special Customers ·················································· 13
[ 2 ] Application for "Guideline for Suppressing Harmonics by Customers Receiving
High Voltage or Special High Voltage" ···························································· 13
B.2 Complying with "Guideline for Suppressing Harmonics by Customers Receiving
High Voltage or Special High Voltage" ···························································· 15
[ 1 ] Calculation of equivalent capacity (Pi)····························································· 15
[ 2 ] Harmonic Current Calculation ······································································· 16
[ 3 ] Examples of calculation ··············································································· 18
Appendix C Effect on Insulation of General-purpose Motors Driven with 400 V Class Inverters ···· 19
C.1 Generating mechanism of surge voltages ························································ 19
C.2 Effect of surge voltages ··············································································· 20
C.3 Countermeasures against surge voltages ························································ 21
[ 1 ] Using a surge suppressor unit (SSU) ······························································ 21
[ 2 ] Suppressing surge voltages ········································································· 21
[ 3 ] Using motors with enhanced insulation ··························································· 21
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