Induction Noise: Electromagnetic induction generates noiseonthe signal line,causing
the controller to malfunction.
Radio Noise: Electromagnetic waves from the Inverter and cables cause the
broadcasting radio receiver to make noise.
How to Prevent Induction Noise
As described above, a noise filter can be used to prevent induction noise from being
generated on the output side. Alternatively, cables can be routed through a grounded
metal pipe to prevent induction noise. Keeping the metal pipe at least 30 cm away from
the signal line considerably reduces induction noise.
3G3EV
30 cm min.
MCCB
Metal pipe
Power supply
Signal line
Controller
How to Prevent Radio Noise
Radio noise is generated from the Inverter as well as the input and output lines. To re-
duce radio noise, install noise filters on both input and output sides, and also install the
Inverter in a totally enclosed steel box.
The cable between the Inverter and the motor should be as short as possible.
3G3EV
Power supply
Steel box
Noise
filter
Noise
filter
Metal pipe
Chapter 3
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