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INSTALLATION AND WIRING
36
Table 5 Rated Capacities and Outgoing Harmonic Currents for Inverter Drive
Rated
Current [A]
Fundamental Wave Current Converted from 6.6kV
(No reactor, 100% operation ratio)Applied
Motor
(kW)
200V
6.6kV
Equivalent of
Fundamental
Wave Current
(mA)
Rated
Capacity
(kVA)
5th 7th 11th 13th 17th 19th 23rd 25th
0.4
1.61
(Note)
49 0.57 31.85 20.09 4.165 3.773 2.107 1.519 1.274 0.882
0.75
2.74
(Note)
83 0.97 53.95 34.03 7.055 6.391 3.569 2.573 2.158 1.494
1.5
5.50
(Note)
167 1.95 108.6 68.47 14.20 12.86 7.181 5.177 4.342 3.006
2.2
7.93
(Note)
240 2.81 156.0 98.40 20.40 18.48 10.32 7.440 6.240 4.320
3.7
13.0
(Note)
394 4.61 257.1 161.5 33.49 30.34 16.94 12.21 10.24 7.092
5.5 19.1 579 6.77 376.1 237.4 49.22 44.58 24.90 17.95 15.05 10.42
7.5 25.6 776 9.07 504.4 318.2 65.96 59.75 33.37 24.06 20.18 13.97
Note: When a motor of 3.7kW or less capacity is driven by a transistorized inverter of
more than 3.7kW. For example, when a 3.7kW or less motor is driven by a
5.5kW transistorized inverter, the transistorized inverter is not the target of the
household appliances/general-purpose products guideline, but because they
must be included in the calculation of the harmonic current of the guideline, the
fundamental wave input currents are indicated.
3) Harmonic suppression technique requirement
If the outgoing harmonic current is higher than; maximum value per 1kW (contract
power)
×
contract power, a harmonic suppression technique is required.
4) Harmonic suppression techniques
No. Item Description
1
Reactor installation
(ACL, DCL)
Install a reactor (ACL) in the AC side of the inverter or a reactor
(DCL) in its DC side or both to suppress outgoing harmonic
currents.
2
High power factor
converter
(FR-HC)
The converter circuit is switched on-off to convert an input
current waveform into a sine wave, suppressing harmonic
currents substantially. The high power factor converter (FR-HC)
is used with the standard accessory.
3
Installation of power
factor improving
capacitor
When used with a series reactor, the power factor improving
capacitor has an effect of absorbing harmonic currents.
4
Transformer multi-
phase operation
Use two transformers with a phase angle difference of 30
°
as in
-
∆
,
∆
-
∆
combination to provide an effect corresponding to 12
pulses, reducing low-degree harmonic currents.
5
AC filter A capacitor and a reactor are used together to reduce
impedances at specific frequencies, producing a great effect of
absorbing harmonic currents.
6
Passive filter
(Active filter)
This filter detects the current of a circuit generating a harmonic
current and generates a harmonic current equivalent to a
difference between that current and a fundamental wave current
to suppress a harmonic current at a detection point, providing a
great effect of absorbing harmonic currents.
2