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Bonding Your System
Allen-Bradley PLCs
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 1.3
Mounting the 1394 with heatsinks through the back of the cabinet
After you have established your panel layout, you need to understand
how to bond your system and subpanels. Bonding is the practice of
connecting metal chassis, assemblies, frames, shields and enclosures
to reduce the effects of electromagnetic interference (EMI).
Bonding Modules
Unless specified, most paints are not conductive and act as insulators.
To achieve a good bond between modules and the subpanel, the
surfaces need to be paint-free or plated. Bonding metal surfaces
creates a low impedance exit path for high frequency energy.
Improper bonding blocks that direct exit 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. The illustrations that follow (refer to Figure 1.4)
show details of recommended bonding practices for painted panels,
enclosures and mounting brackets.
Installing Your 1394 SERCOS Interface System
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
1-7
Publication 1394-5.20 — July 2001
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