Rockwell Automation 1397 DC Drive Firmware 2.xx - Manual (Page 240)

CE Conformity B–8
Publication 1397-5.0 — June, 2001
Star grounding must be used and must provide traditional product
safety grounds, such as high current, low frequency, and high
frequency noise control.
System Power Ground – The common power distribution system
found in European countries includes the grounded neutral of the
WYE transformer, as shown in Figure B.4. This fourth wire
provides the system ground for the electrical equipment and a return
path for ground current. A ground terminal of adequate size for the
expected ground conductor must be provided for this ground wire
because it will enter the cabinet combined with the three–phase
power leads.
If the power distribution ground lead is not provided, you must
provide a fine-braided copper strap conductor of sufficient current
capacity to handle system ground fault currents. This strap must be
connected from the system ground terminal to the building’s steel
works.
Figure B.4
Typical European Power Distribution
U
V
W
Center of Star
Distribution Transformer Control Equipment
Control System Ground – A star ground system must be provided.
For convenience, the star ground can be extended by using copper
bus bar that is at least 10 times wider than it is thick.
All electronic and electromagnetic equipment on the panel must be
connected to the star system. Equipment that must be connected
includes the 1397 Drive, the AC line filter, the AC line inductor, the
cabinet door, and all non-welded (side and back) panels. To connect
the equipment, use fine-wire braided copper strap. The strap should
be at least 3.2 mm x 12.7 mm (0.125’ x 0.5’) with 150 strands.
Provide a convenience termination ground for the connection of the
shield of shielded signal and power cables. Refer to Figures B.5 and
B.6 for proper termination of shielded cables.
Grounding Requirements