Fuji Electric frenic mini series, User Manual

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A-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 Noise prevention measures
Notes
1 AM
radio
When operating an inverter,
noise enters into an AM
radio broadcast (500 to 1500
kHz).
<Possible cause>
The AM radio may receive
noise radiated from wires at
the power supply and output
sides of the inverter.
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 inverter as
much as possible (within 1m).
1) The radiation
noise of the
wiring can be
reduced.
2) The conduction
noise to the
power supply
side can be
reduced.
Note: Sufficient
improvement may
not be expected in
narrow regions such
as between
mountains.
2 AM
radio
When operating an inverter,
noise enters into an AM
radio broadcast (500 to 1500
kHz).
<Possible cause>
The AM radio may receive
noise radiated from the
power line at the power
supply side of the inverter.
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. In
addition, wiring between
the inverter and the zero-
phase reactor (or ferrite
ring) should be as short
as possible. (within 1m)
2) When further
improvement is
necessary, install LC
filters.
1) The radiation
noise of the
wiring can be
reduced.