Omron M1 Series User Manual page 111

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 Voltages 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.
 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.
M1 Series EtherCAT Type User's Manual (I670)
Inverter
Inverter
Inverter
Inverter
Inverter
Inverter
Base frequency
(60 Hz)
Base frequency (60 Hz)
Distorted waveform
2 Design
Your ground bolt
2nd harmonics (120 Hz)
3rd harmonics (180 Hz)
3rd harmonics (180 Hz)
2-53
2