Rockwell Automation 1336T FORCE Series B - Manual (Page 34)

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Chapter 2
Installation/Wiring
2–14
RFI Filtering 1336 FORCE 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. Also refer to “Motor Cables” in the Appendix of this manual.
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 (EN 55011, VDE0875, BSA, FCC)
the optional RFI filter should be used.
Important: The conformity of the drive and filter to any standard does not
assure 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. Refer to “Motor Cables” in the Appendix.
RFI Filter Leakage Current
The optional RFI filter may cause ground leakage currents. Therefore an
appropriate ground connection must be provided (refer to grounding
instructions on the following page).
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 Ground Delta supplies.