Mitsubishi Electric FR-E540 Instruction Manual download pdf (Page 42)

INSTALLATION AND WIRING

4) Harmonic suppression techniques

No. Item Description

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.

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.

Installation of power

factor improving

capacitor

When used with a series reactor, the power factor improving capacitor has an effect of absorbing

harmonic currents.

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 impedance at specific frequencies,

producing a great effect of absorbing harmonic currents.

6 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.

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Mitsubishi Electric FR-E540 Instruction Manual Page 42