Rockwell Automation 2092-DAx Ultra1500 User Manual - Manual (Page 24)

Publication 2092-UM001D-EN-P — July 2005
1-12 Installing Your Ultra1500
Bonding Modules
Unless specified, most paints are not conductive and they act as insulators. To
achieve a good bond between modules and the subpanel, 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 1.3) show details of recommended
bonding practices for painted panels, enclosures, and mounting brackets.
Figure 1.3
Recommended Bonding Practices
IMPORTANT
To improve the bond between the drive and subpanel,
construct your subpanel out of zinc plated (paint-free)
steel.
Stud-mounting the subpanel
to the enclosure back wall
Stud-mounting a ground bus
or chassis to the subpanel
Subpanel Welded stud
Scrape paint
Flat washer
If the mounting bracket is coated with
a non-conductive material (anodized,
painted, etc.), scrape the material
around the mounting hole.
Star washer
Nut
Nut
Flat washer
Mounting bracket or
ground bus
Use a wire brush to remove paint from
threads to maximize ground
connection.
Back wall of
enclosure
Welded
stud
Subpanel
Star washer
Use plated panels or scrape paint on
front of panel.
Subpanel
Nut
Nut
Star washer
Flat washer
Star washer
Star washer
Scrape paint on both sides of
panel and use star washers.
Tapped hole
Bolt
Flat washer
Ground bus or
mounting bracket
If the mounting bracket is coated with
a non-conductive material (anodized,
painted, etc.), scrape the material
around the mounting hole.
Bolt-mounting a ground bus or chassis to the back-panel