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Pepperl+Fuchs Podcasts

Pepperl+Fuchs’ TechTalk helps listeners gain an insight into modern automation technologies by focusing on AS-Interface (Actuator Sensor Interface) and its associated safety technology, Safety at Work. TechTalk covers topics that range from hardware selection to installation and maintenance. Control engineers familiar with AS-Interface will get the latest news on specification enhancements, hear about new products, and familiarize themselves with established and cutting-edge troubleshooting methods, tips, and tricks.  Users who are interested in applying these technologies will learn what it takes to set up an AS-Interface system, how Safety at Work improves safety systems, and why those technologies have the potential to save time and money during all phases of a project.

Dec 8, 2013

Ground faults for AS-Interface must be avoided. No news here. In this case we were confronted with an AS-Interface system composed of three networks and suddenly all three networks reported a ground fault. How is that possible?  Systematic troubleshooting makes it easy and fast to figure out what is going on.

The second topic today deals with connecting two e-stops in series to a single safe input module. Everything worked until the installers tested an e-stop.  Now they were not able to restart. Strange?  Fortunately, there are LEDs on the safety modules to troubleshoot these kinds of situations. 

  • -- When multiple AS-Interface networks are powered from one common power supply using power conditioners, ground faults on any of the three networks will feedback onto the other networks. We tell you how to go about determining where the issue is.
  • -- Connecting multiple e-stops in series to one safety module is a common procedure.  But, the first contact of e-stop 1 must be connected in series with the first contact of e-stop 2 going to the first input on the module.  It's the same for the other sets of contacts.