Control Signal Wiring Design Considerations; Control Signal Wire Shield Grounding - Allen-Bradley PowerFlex 6000 Installation Instructions Manual

Control Signal Wiring Design
Considerations
Use shielded cables for all the analog and digital control cables.
Steel conduit or a cable tray can be used for all PowerFlex 6000 drive power or
control wiring; however, use only steel conduit for all signal wiring.
ATTENTION: Steel conduit is required for all control and signal circuits when
the drive is installed in European Union countries.
Wires for digital and analog signals must be routed separately.
Control cables and power cables must be routed separately; the distance between
the control cable tray and the power cable tray must not be less than 300 mm.
If the control cable must pass through the power cable tray, the angle between the
cable trays must be as close to 90° as possible.
Do not mix AC and DC wires in the same cable bundle.
General Wire Categories on page 51
installing the PowerFlex 6000 drive. Each category has an associated wire group
number that is used to identify the required wire. Application and signal
examples, along with the recommended type of cable for each group, are
provided. A matrix providing the recommended minimum spacing between
different wire groups which run in the same tray or in a separate conduit is also
provided.

Control Signal Wire Shield Grounding

Guidelines for Drive Signal and Safety Grounds: when using interface cables
carrying signals, where the frequency does not exceed 1 MHz, for
communications with the drive, follow these general guidelines:
• Ground screen mesh around the entire circumference, rather than forming
a pigtail grounded only at one point.
• For coaxial cables with a single conductor surrounded by a mesh screen,
ground the screen at both ends.
• When using a multi-layer screened cable (that is, a cable with both a mesh
screen and a metal sheath or some form of foil), there are two alternative
methods:
– Ground the mesh screen at both ends to the metal sheath. The metal
sheath or foil (known as the drain) should, unless otherwise specified,
be grounded at one end only, again, as specified above, at the receiver
end or the end that is physically closest to the main equipment ground
bus
– Leave the metal sheath or foil insulated from ground, and ground the
other conductors and the mesh cable screen at one end only, as stated
above.
Rockwell Automation Publication 6000-IN006F-EN-P - March 2018
Drive Electrical Installation
identifies general wire categories for
Chapter 2
27