Rockwell Automation FlexPak 3000 DC Drive Version 4.3 - Manual (Page 81)

Compliance with European Union Electromagnetic Compatibility Standards B-9
B.4 Grounding Requirements
Star grounding must be used and must provide traditional product safety grounds,
such as high current, low frequency, and high frequency noise control.
B.4.1 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.7.
Local code determines whether this fourth wire may be used as the system ground. In
all installations, provide a good low impedance path from the electrical equipment
back to the power distribution transformer. Local code will determine the size of the
ground conductor.
Figure B.7 – Typical Power Distribution In European Countries
B.4.2 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 FlexPak 3000 drive, the
AC mains filter, the AC mains inductor, the cabinet door, and all non-welded (side and
back) panels. To connect the equipment, use fine-wire braided 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 screen of signal
and power screened cables. See figures B.8 and B.9 for proper termination of
screened cables. See chapter 2 for drive grounding point locations.
U
V
W
Distribution
Transformer
Control
Equipment
Center of
Star