3-17
D Installing a Noise Filter on the Output Side
Connect a noise filter to the output side of the Inverter to reduce radio noise and induc-
tion noise.
3G3EV 3G3IV-PLF
Power supply
Noise
filter
Signal line
Controller
Induction noise Radio noise
AM radio
Induction Noise: Electromagnetic induction generates noise on the signal line, causing
the controller to malfunction.
Radio Noise: Electromagnetic waves from the Inverter and cables cause the
broadcasting radio receiver to make noise.
D 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
D 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.
Design Chapter 3
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