Appendix A Trouble-free Use of Inverters (Notes on electrical noise)
Appendix-8
[ 3 ] Noise prevention examples
Table A-2 lists examples of the measures to prevent noise generated by a running inverter.
Table A-2 Examples of Noise Prevention Measures
No.
Target
device
Phenomena Measure
Notes
1 AM radio Noise enters the AM radio
broadcast (500-1500kHz) when
the inverter is operated.
<Possible cause>
Radiated noise from the power
source and output wiring of
inverted was received by the AM
radio.
1) Install an LC filter at the
power supply side of the
inverter. (In some cases, a
capacitive filter may be used
as a simple method.)
2) Install a metal conduit wiring
between the motor and
inverter.
Note: Minimize the distance
between the LC filter and
the inverter (within 1 m).
1) The radiated noise
of the wiring can be
reduced.
2) Reduce the
conducted noise to
the power source
or apply shielded
wiring.
Note:
Sufficient
improvement may not
be expected in narrow
regions such as
between mountains.
2 AM radio Noise enters the AM radio
broadcast (500 to 1500kHz)
when the inverter is operated.
<Possible cause>
Radiated noise from the power
line of inverter’s power source
was received by the AM radio.
1) Install inductive filters at the
input and output sides of the
inverter.
The number of turns of the
zero-phase reactor (or ferrite
ring) should be as large as
possible. Minimize the
distance between the
inverter and the inductive
filter (within 1 m).
2) When further improvement is
necessary, install LC filters.
1) The radiated noise
of the wiring can be
reduced.
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