Omron M1 Series User Manual page 109

Power
supply
Three-phase 200 VAC
Three-phase 400 VAC
Noise
Inductive noise
Radio noise
 Measures against inductive noise
In addition to the noise filter described above, you can suppress the inductive noise produced on
the output side by connecting a bundle of wires through a grounded metal conduit.
Moreover, moving the conduit 30 cm or more away from signal lines helps the reduction of induc-
tive noise.
Power
supply
Three-phase 200 VAC
Three-phase 400 VAC
 Measures against radio noise
Besides the I/O wires, radio noise is radiated from the inverter itself.
This radio noise can be reduced by installing noise filters on both the input and output sides of the
inverter and by installing and shielding the inverter body in a grounded iron enclosure etc.
Keep the cables between the inverter and the motor as short as possible.
Power
MCCB
supply
Three-phase 200 VAC
Three-phase 400 VAC
M1 Series Standard Type User's Manual (I669)
3G3M1 Series
MC
MCCB
Signal line
Produced by electromagnetic induction, this noise causes malfunction of control equipment
due to noise in signal lines.
The electromagnetic waves emitted from the inverter body or cables cause noise in radio
receivers.
3G3M1 Series
MC
MCCB
Iron enclosure
3G3M1 Series
MC
Noise filter
Inverter Noise filter
Inductive noise
Controller
Description
Metal conduit
Inverter
Signal line
Controller
Metal conduit
Inverter Noise filter
2 Design
M
Radio noise
AM radio
M
30 cm or more
M
2-49
2