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Mitsubishi Electric FR-A520-0.4K -55K Instruction Manual Page 43

Transistorized inverter, high function & low acoustic noise.
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4) Harmonic suppression techniques
No.
Item
Reactor installation
Install a reactor (ACL) in the AC side of the inverter or a reactor (DCL) in its DC side or both to
1
(ACL, DCL)
suppress outgoing harmonic currents.
High power factor
The converter circuit is switched on-off to convert an input current waveform into a sine wave,
2
converter
suppressing harmonic currents substantially. The high power factor converter (FR-HC) is used
(FR-HC)
with the standard accessory.
Installation of power
When used with a series reactor, the power factor improving capacitor has an effect of absorbing
3
factor improving
harmonic currents.
capacitor
Use two transformers with a phase angle difference of 30° as in Y-∆, ∆-∆ combination to provide
Transformer multi-
4
phase operation
an effect corresponding to 12 pulses, reducing low-degree harmonic currents.
A capacitor and a reactor are used together to reduce impedance at specific frequencies,
5
AC filter
producing a great effect of absorbing harmonic currents.
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
6
Active filter
current to suppress a harmonic current at a detection point, providing a great effect of absorbing
harmonic currents.
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INSTALLATION AND WIRING
Description
32

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