Omron SYSDRIVE 3G3JV User Manual page 47

Design
• When using more than one Inverter, be careful not to loop the ground wire.
H Countermeasures against Harmonics
With the continuing development of electronics, the generation of harmonics from indus-
trial machines has been causing problems recently.
The Ministry of International Trade and Industry provided some guidelines in September
1994 for the suppression of harmonics from electrical household appliances and electri-
cal equipment in Japan. Since then, the problem has been drawing considerable atten-
tion.
Refer to the following information for the definition of harmonics (i.e., harmonic currents
with voltages) and countermeasures against the generation of harmonics from the
Inverter.
D Harmonics
Definition
Harmonics consist of electric power produced from AC power and alternating at frequencies that are
integral multiples of the frequency of the AC power.
2-22
Chapter 2