Chapter 8
Appendix 1. Advantageous Use of Inverters (with regard to Electrical Noise)
8-8
1.3.3 Specific examples
Table 2 lists specific examples of the measures to prevent noise generated by operation of the inverter.
Table 2 Specific examples of noise prevention measures
1 A
M radio
2 AM radio
3 Telephone (in a
common private
residence at a
distance of 130ft
(40m))
When operating an inverter, noise entered
into AM radio broadcast (500 to 1500kHz).
<Estimated cause>
It is considered that the AM radio receives
noise radiated from wires at the power
supply and output sides of the inverter.
When operating an inverter, noise entered
into AM radio broadcast (500 to 1500kHz).
<Estimated cause>
It is considered that the AM radio receives
noise radiated from the power line at the
power supply side of the inverter.
When driving a ventilation fan with an
inverter, noise entered a telephone in a
private residence at a distance of 130ft
(40m).
<Estimated cause>
A high-frequency leakage current from the
inverter and motor flowed to grounded part
of the telephone cable shield. During the
current’s return trip, it flowed through a
grounded pole transformer, and noise
entered the telephone by electrostatic
induction.
q
Install an LC filter on the power
supply side of the inverter. (A
simple method is to install a
capacitive filter.
w
Install a metal conduit wiring
between the motor and inverter.
Note: Minimize the distance between the
LC filter and inverter as much as
possible (within 3ft (1m)).
q
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.
Further, wiring between the inverter
and the zero-phase reactor (or
ferrite ring) should be short as
possible. (within 3ft (1m))
w
When further improvement is
necessary, install LC filters.
q
Connect the ground terminals of the
motors in a common connection.
Return to the inverter panel, and
insert a 1
µ
F capacitor between the
input terminal of the inverter and
ground.
q
The radiation noise of the wiring
is reduced.
w
The conduction noise to the
power supply side is reduced.
Further, shielded wiring is used.
Note: Sufficient improvement may not
be expected in narrow regions
such as between mountains.
q
The radiation noise of the wiring
is reduced.
q
The effect of the inductive filter
and LC filter may not be
expected because of sound
frequency component.
w
In the case of a V–connection
power supply transformer in a
230V system, it is necessary to
connect capacitors as shown in
the following figure, because of
different potentials to the
ground.
No. Target device
Phenomena
Noise prevention measures
Notes
Power
supply
M
AM radio
Inverter
Inverter
Pole
transformer
Radio
M
Power
Supply
M
Inductive filter
(Ferrite ring)
Inductive filter
(Ferrite ring)
Be
short
Be
short
}
}
Inverter
LC
filter
Power
supply
M
Output side
LC
filter
Input side
Inverter
M
M
M
40m
Private
house
Pole transformer
Inverter
M
M
M
1
µ
F
Inverter
M
C
C
C
C=1
µ
F
Power supply transformer
Inverter
Power
supply
M
LC filter
Capacitive
filter
Inverter
Chapter8-1(P1˜10).p65
07.8.9, 12:57
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