Mitsubishi Electric F700 Instruction Manual page 57

3) Harmonic suppression technique requirement
If the outgoing harmonic current is higher than the maximum value per 1kW (contract power) × contract power, a
harmonic suppression technique is required.
4) Harmonic suppression techniques
No. Item
Reactor installation
1
(FR-HAL, FR-HEL)
High power factor converter
2
(FR-HC, MT-HC)
Installation of power factor
3
improving capacitor
Transformer multi-phase
4
operation
Passive filter
5
(AC filter)
6 Active filter
Install an AC reactor (FR-HAL) on the AC side of the inverter or a DC reactor (FR-HEL) on
its DC side or both to suppress outgoing harmonic currents.
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, MT-HC) is used with the standard accessory.
When used with a series reactor, the power factor improving capacitor has an effect of
absorbing harmonic currents.
Use two transformers with a phase angle difference of 30° as in
to 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,
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
current to suppress a harmonic current at a detection point, providing a great effect of
absorbing harmonic currents.
Noise and leakage currents
Description
- , - combination
49
3