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EMC and leakage currents
3
PRECAUTIONS FOR USE OF THE INVERTER
3.1.3 Power supply harmonics
The inverter may generate power supply harmonics from its converter circuit to affect the power generator, power
capacitor etc. Power supply harmonics are different from noise and leakage currents in source, frequency band and
transmission path. Take the following countermeasure suppression techniques.
This inverter has a built-in AC reactor (FR-HAL) and a circuit type specified in Harmonic suppression guideline in Japan
is three-phase bridge (capacitor smoothed) and with reactor (AC side).
3.1.4 Harmonic suppression guideline
Harmonic currents flow from the inverter to a power receiving point via a power transformer. The harmonic suppression
guideline was established to protect other consumers from these outgoing harmonic currents.
The three-phase 200V input specifications 3.7kW or less are previously covered by "Harmonic suppression guideline
for household appliances and general-purpose products" and other models are covered by "Harmonic suppression
guideline for consumers who receive high voltage or special high voltage". However, the general-purpose inverter has
been excluded from the target products covered by "Harmonic suppression guideline for household appliances and
general-purpose products" in January 2004. Later, this guideline was repealed on September 6, 2004. All capacities of
all models are now target products of "Harmonic suppression guideline for consumers who receive high voltage or
special high voltage" (hereinafter referred to as "Guideline for specific consumers").
"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 is
exceeded, this guideline requires that consumer to take certain suppression measures.
(1) Application of the harmonic suppression guideline for specific consumers
Table 1 Maximum Values of Outgoing Harmonic Currents per 1kW Contract Power
Received Power
Voltage
5th 7th 11th 13th 17th 19th 23rd Over 23rd
6.6kV 3.5 2.5 1.6 1.3 1.0 0.9 0.76 0.70
22kV 1.8 1.3 0.82 0.69 0.53 0.47 0.39 0.36
33kV 1.2 0.86 0.55 0.46 0.35 0.32 0.26 0.24
Install, add or renew
equipment
Calculation of equivalent
capacity total
Equivalent
capacity total
Calculation of outgoing
harmonic current
Not more than
harmonic current upper
limit?
Harmonic suppression
measures unnecessary
Harmonic suppression
measures necessary
Equal to or less
than upper limit
More than upper limit
Above reference
capacity
Equal to or less
than reference
capacity