Zero phase reactors, (aka
RF noise filters) help reduce radiated noise from the
inverter wiring. The wiring must go through the opening
to reduce the RF component of the electrical noise.
Loop the wires three times (four turns) to attain the
full RF filtering effect. For larger wire sizes, place
multiple zero-phase reactors (up to four) side by side
for a greater filtering effect. These are effective
for noise reduction on both the input and output sides
of the inverter. Attenuation quality is good in a wide
range from AM band to 10Mhz.
Wiring Method
Wind each wire four times
around the core, as shown in diagram A to the right.
The reactor must be put at inverter side as closely
as possible. If you are unable to wire as above due to wire size
or another aspect of your application, put all wires
through four cores in series without winding, as in
diagram B to the right.
