User`s guide

166
CHAPTER 8 - CFW-08 OPTIONS AND ACCESSORIES
8.
20
RFIFIL
TER
The installation of frequency inverters requires some care in
order to prevent electromagnetic interferences (EMI).
This electromagnetic interference may disturb the operation
of the inverter itself or other devices, such as electronic
sensors, PLCs, transducers, radio equipment, etc. installed
in the proximity.
To avoid these troubles, follow the installation instructions
contained in this manual.
In these cases, avoid the installationof electromagnetic noise
generating circuits, such as power cables, motors, etc. near
to signal or control cables.
Care should also be taken with the radiated interference, by
shielding the cables and the circuits that tend to emit
electromagnetic waves and can cause interference.
The electromagnetic interference can also be transmitted
through power supply line. This type of interference is
minimized in the most cases by capacitive filters which are
alreadyinstalled inside the CFW-08.
However, wheninverters are installed in residential areas, the
installation of additional filter may be required.
These filters may be installed internally (on some types) or
externally.
As defined in standards, the Category C1 filter has more
attenuation capacity than the Category C2 filter , thus being
more suitable for residential areas.
Item 8.1 lists theavailableRFIfilters with the respectiveinverter
models.
The inverters with internal Category C2 filters have the same
external dimensions as the inverters without filter.
The external Category C1 filters must be installed between
the power supplyline and the inverter input, asshown in figure
8.28.
Instructions forthe RFI filter installation:
I
nstall the inverter and the filter on a metallic grounded
plate as near to each other as possible and ensure a
good electrical contact between the grounded plate and
the inverter and filter frames.
For motor connection use a shielded cable or individual
cables inside a grounded metallic conduit.
NOTE!
For installations that must meetthe European standards refer
to item 3.3.