Mitsubishi Electric 800 Series Instruction Manual page 99

 Harmonic suppression techniques
No. Item
Reactor installation (FR-
1
HAL, FR-HEL)
High power factor
converter (FR-HC2),
2
multifunction regeneration
converter (FR-XC)
Installation of power factor
3
improving capacitor
Transformer multi-phase
4
operation
Passive filter
5
(AC filter)
6 Active filter
*1 The safety communication model (FR-E800-SCE) is not intended for the use with the high power factor converter (FR-HC2) or multifunction
regeneration converter (FR-XC in common bus regeneration mode).
98
3. Precautions for Use of the Inverter
3.2 Power supply harmonics
Install an AC reactor (FR-HAL) on the AC side of the inverter or a DC reactor (FR-HEL) on its DC side,
or install both to suppress outgoing harmonic currents.
These converters trim the current waveform to be a sine waveform by switching the rectifier circuit
(converter module) with transistors. Doing so suppresses the generated harmonic amount significantly.
Connect it to the DC area of an inverter. Use the high power factor converter (FR-HC2) with the
accessories that come as standard. To use the FR-XC series converter, use the converter with an FR-
*1
XCB box-type reactor and enable the harmonic suppression function.
When used with a reactor connected in series, the power factor improving correction capacitor can
absorb harmonic currents.
Use two transformers with a phase angle difference of 30° in combinations of
provide an effect corresponding to 12 pulses, reducing low-degree harmonic currents.
A capacitor and a reactor are used together to reduce impedances at specific frequencies. Harmonic
currents are expected to be absorbed greatly by using this technique.
This filter detects the current in 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 the
harmonic current at the detection point. Harmonic currents are expected to be absorbed greatly by using
this technique.
Description
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