Instruction manual

37
3
PRECAUTIONS FOR USE OF THE INVERTER
EMC and leakage currents
3.1.4 Harmonic Suppression Guidelines in Japan
Harmonic currents flow from the inverter to a power receiving point via a power transformer. The Harmonic Suppression
Guidelines was established to protect other consumers from these outgoing harmonic currents.
The three-phase 200V input specifications 3.7kW or lower (single-phase 200V power input model 2.2kW or lower are
previously covered by "Harmonic Suppression Guidelines for Household Appliances and General-purpose Products" and
other models are covered by "Harmonic Suppression Guidelines for Consumers Who Receive High Voltage or Special High
Voltage". However, the transistorized inverter has been excluded from the target products covered by "Harmonic Suppression
Guidelines for Household Appliances and General-purpose Products" in January 2004 and "Harmonic Suppression
Guidelines for Household Appliances and General-purpose Products" was repealed on September 6, 2004.
All capacity and all models of general-purpose inverter used by specific consumers are covered by "Harmonic Suppression
Guidelines for Consumers Who Receive High Voltage or Special High Voltage" (hereinafter referred to as "Specific Consumer
Guidelines").
"Specific Consumer Guidelines"
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 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 0.820.690.530.470.390.36
33kV 1.2 0.86 0.55 0.46 0.35 0.32 0.26 0.24
Table 2 Conversion Factors for FR-E700 Series
Class Circuit Type Conversion Factor (Ki)
3
Three-phase bridge
(Capacitor smoothing)
Without reactor K31= 3.4
With reactor (AC side) K32 = 1.8
With reactor (DC side) K33 = 1.8
With reactors (AC, DC sides) K34 = 1.4
4
Single-phase bridge
(Capacitor smoothing)
Without reactor K41= 2.3
With reactor (AC side) K42 = 0.35 *
∗ K42=0.35 is a value when the reactor value is 20%. Since a 20% reactor is large and considered to be not practical, K42=1.67 is written as conversion
factor for a 5% reactor in the technical data JEM-TR201 of The Japan Electrical Manufacturers' Association and this value is recommended for calculation
for the actual practice.
Table 3 Equivalent Capacity Limits
Received Power Voltage Reference Capacity
6.6kV 50kVA
22/33 kV 300kVA
66kV or more 2000kVA
Install, add or renew
equipment
Calculation of equivalent
capacity total
Equal to or less
than reference
capacity
Equivalent
capacity total
Above reference
capacity
Calculation of outgoing
harmonic current
Not more than
harmonic current upper
limit?
Equal to or less
than upper limit
Harmonic suppression
measures unnecessary
More than upper limit
Harmonic suppression
measures necessary