2.3.2 Japanese harmonic suppression guidelines
Harmonic currents flow from the inverter to a power receiving point via a power transformer. The harmonic
suppression guidelines were established to protect other consumers from these outgoing harmonic currents.
This guideline was issued by the Ministry of International Trade and Industries in September, 1994 and
applies to 200V class inverters of 3.7kW (5HP) and less. By installing the FR-BEL or FR-BAL power factor
improving reactor, inverters comply with the "harmonic suppression techniques for transistorized inverters
(input current 20A or less)" established by the Japan Electrical Manufacturers' Association. Therefore
install the optional reactor for the 200V class, 3.7kW (5HP) or less inverter.
2) "Harmonic suppression guideline for specific consumers"
This guideline sets forth the maximum values of harmonic currents outgoing from a high-voltage or
especially high-voltage consumer who will install, add or renew harmonic generating equipment. If any of
the maximum values are exceeded, this guideline requires that consumer to take certain suppression
Table 1 Maximum Values of Outgoing Harmonic Currents per 1kW Contract Power
( 1 ) Application of the harmonic suppression guideline for specific consumers
New installation/addition/renewal of equipment
Calculation of equivalent capacity sum
Not more than
Over reference capacity
Calculation of outgoing harmomic current
Harmomic suppression technique is not required.
Table 2 Conversion Factors for FR-A500 Series
Self-exciting 3-phase bridge When high power factor converter is used
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Sum of equivalent capacities
Is outgoing harmonic cur-
rent equal to or lower than
maximum value ?
Harmomic suppression technique is required.
Not more than
With reactor (AC side)
With reactor (DC side)
With reactors (AC, DC sides)
INSTALLATION AND WIRING
Over maximum value
K31 = 3.4
K32 = 1.8
K33 = 1.8
K34 = 1.4
K5 = 0