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 proximity switches ··········································································· 1
[ 4 ] Effect on pressure sensors ············································································· 1
[ 5 ] Effect on position detectors (pulse encoders) ····················································· 1
A.2 Noise ········································································································· 2
[ 1 ] Inverter noise ······························································································ 2
[ 2 ] Types of noise ····························································································· 3
A.3 Measures ··································································································· 5
[ 1 ] Noise prevention prior to installation ································································· 5
[ 2 ] Implementation of noise prevention measures ···················································· 5
[ 3 ] Noise prevention examples ············································································ 8
Appendix B
Japanese Guideline for Suppressing Harmonics by Customers Receiving High Voltage or
Special High Voltage (General-purpose inverter)
····················································· 12
B.1
Application to general-purpose inverters ·························································· 12
[ 1 ] Guideline for suppressing harmonics in home electric and
general-purpose appliances ········································································· 12
[ 2 ] Guideline for suppressing harmonics by customers receiving high voltage or
special high voltage ···················································································· 12
B.2 Compliance to the harmonic suppression for customers receiving high voltage or
special high voltage ···················································································· 13
[ 1 ] Calculation of equivalent capacity (Pi)····························································· 13
[ 2 ] Calculation of Harmonic Current ···································································· 14
[ 3 ] Examples of calculation ··············································································· 16
Appendix C Effect on Insulation of General-purpose Motors Driven with 400 V Class Inverters ···· 17
C.1
Generating mechanism of surge voltages ························································ 17
C.2 Effect of surge voltages ··············································································· 18
C.3 Countermeasures against surge voltages ························································ 19
[ 1 ] Using a surge suppressor unit, SSU (Patent pending) ········································ 19
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