Rockwell Automation 1768-PA3_PB3 CompactLogix Power Supplies Installation Instructions - Manual (Page 20)

20 1768 CompactLogix Power Supplies
Publication 1768-IN001B-EN-P - July 2006
Ground the Power Supply
Ground the power supply on a ground bus with a dedicated earth-ground stake.
The ground bus should also be connected to a functional earth ground on the DIN
rail or panel. The upper left tab on the power supply serves as a functional ground.
Refer to Industrial Automation Wiring and Grounding Guidelines, Allen-Bradley
publication 1770-4.1, for additional information.
Wire the Ground
Complete the following steps to wire the protective-earth ground:
1. Locate the protective-earth ground terminal, indicated by the following
symbol.
2. Turn the screw counterclockwise to open the terminal.
ATTENTION
This product is grounded through the DIN rail to chassis ground. Use
zinc-plated yellow-chromate steel DIN rail to assure proper grounding. The
use of other DIN rail materials, for example, aluminum or plastic, that can
corrode, oxidize, or are poor conductors, can result in improper or intermittent
grounding. Secure DIN rail to mounting surface approximately every 200 mm
(7.87 in.) and use end-anchors appropriately.
Protective Earth Ground
Functional Ground
Dedicated Earth-
Ground Stake
Ground Bus
Compact I/
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Compact I/
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Power Su
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Ground Wiring