Rockwell Automation 1394 SERCOS Interface Multi-Axis Motion Control System Installation Manual - Manual (Page 19)

Publication 1394-IN002B-EN-P — February 2004
Installing Your 1394 SERCOS Interface System 1-9
Mounting Your 1394 Through the Back of the Cabinet
The figure below shows an example of the typical mounting of a 1394
system with 1394x-AM50 or -AM75 axis modules. The 1394x-AM50
and -AM75 have heatsinks that mount through the back of the
electrical cabinet.
Figure 1.4
Mounting the 1394 with heatsinks through the back of the cabinet
HF Bonding Your System Bonding is the practice of connecting metal chassis, assemblies,
frames, shields and enclosures to reduce the effects of electromagnetic
interference (EMI). For more information on the concept of high-
frequency (HF) bonding, the ground plane principle, and electrical
noise reduction, refer to System Design for Control of Electrical Noise
(publication GMC-RM001x-EN-P).
Bonding Modules
Unless specified, most paints are not conductive and they act as
insulators. To achieve a good bond between power rail and the
subpanel, surfaces need to be paint-free or plated. Bonding metal
surfaces creates a low-impedance return path for high-frequency
energy.
Improper bonding blocks the direct return path and allows high-
frequency energy to travel elsewhere in the cabinet. Excessive high-
frequency energy can effect the operation of other microprocessor
controlled equipment.
Note: This configuration requires a gasket between
the 1394x-AM50 or -AM75 and the inside of
the enclosure. use the gasket provided.
Customer-supplied
enclosure
IMPORTANT
To improve the bond between the 1394 SERCOS
interface system and subpanel, construct your
subpanel out of zinc plated (paint-free) steel.