B-1
Hardware and Installation User Manual
APPENDIX B
GROUNDING AND ELECTRICAL
GUIDELINES
B.1
INTRODUCTION
This appendix describes measures you can take to provide a good earth ground
to your system, lists steps you can perform to ensure that your system is not
influenced by electrical noise, and gives instructions for proper wiring.
B.2
GROUNDING
A good grounding system is essential for proper operation of the Series 505
controllers. All filtering devices internal to the 505 system require a good earth
ground for reference. The structural ground present in many industrial
environments does not provide an adequate ground return when direct wire
connection to the power system is not feasible. As a minimum, use #12 AWG
stranded copper wire for the ground return. Minimum wire sizes, color coding,
and general safety practices should comply with all appropriate electrical
standards and codes. Screw connections between bezels and bases, as well as
between enclosures and bases, provide grounds and should be tightened
properly.
B.2.1
Single Point Grounding
Connect any Series 505 component with an external chassis or external ground
terminal on its power connectors to the subpanel ground bus. This connection
should exhibit very low DC resistance (0.05 ohm) and low high-frequency
impedance.
Connect the subpanel ground bus to a single-point ground, such as a copper bus
bar to a good earth ground reference. The single point ought to be the center of a
“star” configuration to minimize device-to-ground distances.
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