Appendix A Trouble-free Use of Inverters (Notes on Electrical Noise)
Appendix-9
[ 3 ] Noise prevention examples
Table A.3-2 lists examples of the measures to prevent noise generated by a running inverter.
Table A.3-2 Examples of noise prevention measures
Noise enters the AM radio
broadcast (500 to 1500 kHz)
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. Or use shielded
wiring.
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. Or use
shielded wiring.
Note:
Sufficient
improvement may not
be expected in
narrow regions such
as between
mountains.
Noise enters the AM radio
broadcast (500 to 1500 kHz)
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.
Inductive filter
(zero-phase
reactor)
Inductive filter
(zero-phase
reactor)
To Next Page
Loading...
