Bonding Multiple Subpanels; Mounting Your 1394 System - AB Quality Allen-Bradley 1394 User Manual

2-8 Installing Your 1394 (applies to all systems)

Mounting Your 1394 System

Publication 1394-5.0 — May 2000

Bonding Multiple Subpanels

Bonding multiple subpanels creates a common low impedance exit
path for the high frequency energy inside the cabinet. Subpanels that
are not bonded together may not share a common low impedance
path. This difference in impedance may affect networks and other
devices that span multiple panels. Refer to the illustration below for
recommended bonding practices.
Figure 2.5
Bonding Multiple Subpanels
Recommended:
Bond the top and bottom of each subpanel
to the cabinet using 25.4 mm (1.0 in.) by 6.35 mm (.25 in.) (minimum) wire braid
The procedures in this section assume you have prepared your panel
and understand how to bond your system. To mount your 1394
system:
1. Install the top mounting fasteners on the subpanel for the system
module and all axis modules. The heads of the fasteners should be
at least 0.25 in. from the panel. Make sure all fasteners are
properly bonded to the subpanel. Refer to Bonding Your System
for more information.
2. Hang the 1394 System Module on the two fasteners on the left
side of the subpanel.
Important: If you are mounting a GMC Turbo system module
(1394x-SJTxx-T), and using the SLC interface, you
will need an additional 101.6 mm (4 in.) of clearance
to the left of the system module to allow for
connecting the SLC interface cable (1746-C7 or -C9).
Bonded cabinet
ground bus
to subpanel
Scrape the paint around each fastener to maximize
metal-to-metal contact