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CHAPTER 8
OPTIONSANDACCESSORIES
This Chapter describes the optional devices that can be used internal
or external with the CFW-10.
NOTE!
The CFW-10 inverter line has filters only for the models with single-
phase power supply.
8.1 RFI FILTER
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 this case, avoid the installation of 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.
Theelectromagnetic interference can alsobe transmitted through power
supply line. This type of interference is minimized in the most cases by
capacitive filters which are already installed inside the CFW-10.
However, when inverters are installed in residential areas, the
installation of additional filter may be required.
These filters can be externally installed on the inverters. The class B
filter has more attenuation than Class A filter as defined on EMC
standard, being more suitable for residential environments. The
existing filters and inverters models which apply are showed on table
3.5. The external filters must be installed between the power supply
line and the inverters input, as further figure 8.1.
Instructions for the RFI filter installation:
Install 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.
Power
Supply
Ground
Filter
CFW-10
Driving Panel
Conduit or
Shielded Cable
Motor
Motor Ground (frame)
PE
Figure 8.1 - Connection of the external RFI filter
PE
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