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Inverter
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Harmonic Current Measures and DC/AC Reactor Wiring (P1, P(+))
In recent years, there is an increasing concern about harmonic currents generated from industrial ma-
chinery.
Harmonic measures must be implemented as Guideline of Countermeasures Taken by Users against
Higher Harmonics Received at High V
oltages or Extremely High Voltages was established by the Min-
istry of International Trade and Industry (current: Ministry of Economy, Trade and Industry) in Septem-
ber, 1994.
The following provides an overview of harmonics and measures against harmonics implemented in
this inverter.
Harmonics
The voltage or current whose frequency is an integral
multiple of certain standard frequency (base frequen-
cy) is called a harmonic.
If a commercial power supply frequency of 60 Hz (50
Hz) is the reference frequency
, the harmonics of that
signal is:
x2 = 120 Hz (100 Hz),
x3 = 180 Hz (150 Hz),
and so on.
Base frequency
(60 Hz)
2nd harmonics (120 Hz)
3rd harmonics (180 Hz)
Reason why harmonics cause problems
As the number of harmonics increases, the wave-
form of the commercial supply has more distortion.
This distortion causes the malfunction of the con-
nected equipment or leads to abnormal heat genera-
tion.
Base frequency (60 Hz) 3rd harmonics (180 Hz)
Distorted waveform
2 Design
2-45
M1 Series Standard Type User's Manual (I669)
2-3 Wiring
2
2-3-4 Wiring for Main Circuit Terminals
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