Grounding Practices for Automation Controls Understanding the Key Elements and Resolving Common Problems

摘要

The topic, often heated and quite animated, of whether a plant or gate station is properly grounded will invariably arise at the same time as, or shortly after, a problem occurs. The problem may be relatively insignificant such as incorrect counts from a flow-metering loop. Or, it may be as disastrous as an explosion and resultant fire. In any case, the fundamental rules of proper grounding must be followed. To this end, it is necessary to adopt a consistent approach throughout your systems, employing star point grounding and proper grounding bed techniques. Use as short and as heavy gauge wire to electrical ground, "mother earth" as possible. Just like a speeding tractor-trailer truck, large surge or fault currents do not take sharp bends in wires well, so provide large radius relief bends in all wiring. Install flange insulators and guards correctly. Finally, pay close attention and adhere to recommended codes of practice...they were drafted after considerable study for the safety of both you and your plant.