M
MC
MCCB
Power
supply
Inverter
3G3M1 Series
Controller
Inductive noise Radio noise
AM radio
Noise filter
Three-phase 200 VAC
Three-phase 400 VAC
Signal line
Noise Description
Inductive noise
Produced by electromagnetic induction, this noise causes malfunction of control equipment
due to noise in signal lines.
Radio noise
The electromagnetic waves emitted from the inverter body or cables cause noise in radio
receivers.
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.
M
MC
MCCB
Power
supply
Inverter
3G3M1 Series
Controller
30 cm or more
Metal conduit
Three-phase 200 VAC
Three-phase 400 VAC
Signal line
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.
M
MC
MCCB
Power
supply
Inverter
3G3M1 Series
Iron enclosure
Metal conduit
Noise filter
Noise filter
Three-phase 200 VAC
Three-phase 400 VAC
2 Design
2-57
M1 Series EtherCAT Type User’s Manual (I670)
2-3 Wiring
2
2-3-4 Wiring for Main Circuit Terminals
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