Ground loops got your process down? Use signal isolators
Acromag advises using signal isolators and splitters to eliminate 4-20 mA errors and ground loops between instruments.
Acromag advises using signal isolators and splitters to eliminate 4-20 mA errors and ground loops between instruments. The primary function of a signal isolator is to eliminate ground loops that may exist between two or more instruments. A traditional application isolates the control room equipment (computers, PLC, DCS etc.) from field devices, which may have different ground potentials. In addition to breaking up ground loops, the isolators protect control room equipment from damaging transient spikes and noise generated in the field, the company says. Some isolators can produce two identical outputs for routing to different instruments. Acromag suggests:
- Choose proper and most cost effective isolator by understanding of the application and consideration of future expansion requirements.
- Consider various isolator models to cover various system configurations.
- Ask for help, if needed, to decide among two-, three-, or four-wire electrical connections. Will the isolator operate from ac, dc, or loop power? Do you need an input, output, or 3-way (input, output, power) isolators?
Also see from Control Engineering :
- Tutorial: Running down interference to improve device performance ;
|Search the online Automation Integrator Guide|
Case Study Database
Get more exposure for your case study by uploading it to the Control Engineering case study database, where end-users can identify relevant solutions and explore what the experts are doing to effectively implement a variety of technology and productivity related projects.
These case studies provide examples of how knowledgeable solution providers have used technology, processes and people to create effective and successful implementations in real-world situations. Case studies can be completed by filling out a simple online form where you can outline the project title, abstract, and full story in 1500 words or less; upload photos, videos and a logo.
Click here to visit the Case Study Database and upload your case study.