Rockwell Automation 1305 AC Drive, Firmware 1.01-3.00 User Manual User Manual
Page 24
Chapter 2 – Installation/Wiring
2-8
RFI FILTERING
1305 drives can be installed with an RFI filter, which controls
radio–frequency conducted emissions into the main supply
lines and ground wiring.
If the cabling and installation recommendation precautions
described in this manual are adhered to, it is unlikely that
interference problems will occur when the drive is used with
conventional industrial electronic circuits and systems.
However, a filter is recommended if there is a likelihood of
sensitive devices or circuits being installed on the same AC
supply or if the motor cable exceeds 50 meters (164 feet).
Beyond this length, capacitance to ground will increase the
supply emissions.
Where it is essential that very low emission levels must be
achieved or if conformity with standards is required (EN55011,
VDE0875, BSI, FCC) the optional RFI filter should be used.
IMPORTANT: The conformity of the drive and filter to any
standard does not guarantee that the entire installation will
conform. Many other factors can influence the total installation
and only direct measurements can verify total conformity.
RFI Filter Installation
The RFI filter must be connected between the incoming AC
supply line and the drive power input terminals.
In general, it is best to install the filter on the same mounting
plate, physically close (and with short connections) to the
drive.
IMPORTANT: To assure that the RFI filter is effective, the
motor cable must be shielded or armored and the guidelines
given in this manual must be followed.
RFI Filter Leakage Current
The optional RFI filter may cause ground leakage currents.
Therefore a solid ground connection must be provided.
ATTENTION: To guard against possible
equipment damage, RFI filters can only be used
with AC supplies that are nominally balanced
with respect to ground. In some countries,
three–phase supplies are occasionally connected
in a 3-wire configuration with one phase
grounded (Grounded Delta). The filter must not
be used in Grounded Delta supplies.