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Grounding and Shielding Existing Equipment

How to effectively minimize EMI issues when best practices are not available

Grounding and Shielding is an often misunderstood process. It is common to hear quotes ranging from “it’s magic!” to “the rules change all the time!” and “there’s no way to understand it!” These emotional statements are repeated but not true. There is a process, it hasn’t changed, and the more one knows about coupling mechanisms the more one will see that it’s sound engineering principals. There's no illusion - sound mathematical and logical process can resolve or reduce electromagnetic interference (EMI) problems to achieve desired machine performance. Let’s review a few of these comments one at a time to dispel these misconceptions.

Undesired signals couple into signals via four coupling factors; magnetic (inductive) coupling, capacitive (high speed voltage changes (dV/dt)) coupling, direct coupling, and radiative (Rf) coupling. These factors have their basis in science. One may not be able to predict the exact path just as one cannot predict the exact path of lightning, but one knows how to limit the chances of getting struck. Lightning is nothing more than one of the most powerful of the EMI events.

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Selecting the Proper Cables for Your Stepper or Servo System

Engineers devote a lot of time and effort designing highly efficient, reliable, and economical stepper or servo motor positioning systems. They select a motor, a controller, appropriate feedback circuits, and an amplifier to satisfy the specific motion system’s needs. Unfortunately, however, the signal and power cables connecting the components are often overlooked until the project is nearing its end or, worse yet, handed off to an electrician who lacks the proper training. Overlooking critical cable selection factors can deliver a system with lower than expected accuracy, frequent failures, low immunity from electromagnetic interference, and adverse effects on neighboring equipment.

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Servo Cables

Drive-to-motor connection methods vary widely depending on rated current and voltage, minimum code distances, different shielding concepts and other factors. We supply pre-assembled ready-to-use cables that meet relevant CE and UL requirements for any power and feedback requirement.

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Engineer the Exceptional

Learn how to engineer exceptional machines, robots and vehicles with the highest-performing, most reliable motors, drives, automation solutions and more.

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