When it comes to emergency stop devices there is no doubt that the red mushroom-head push button is the most common – they seem to be everywhere. The second most common emergency stop device is the pull-cord, and like the light-curtain in safeguarding, the pull-cord is probably the most misapplied emergency stop device. Continue reading “Emergency Stop Pull-Cords”
Many machine designers think of interlocks as exclusively electrical devices; a switch is attached to a movable mechanical guard, and the switch is connected to the control system. Trapped Key Interlocking is a way to interlock guards that is equally effective, and often more appropriate in difficult environmental conditions. Continue reading “Trapped Key Interlocking”
During the Free Safety Talks that we did with Schmersal Canada and Franklin Empire, we had a “hot question” come up regarding Category 2 architecture and the testing interval requirement. In the short video below, Doug answers that question.
If you have more questions or felt something wasn’t clear in the video, leave us a comment and we will get back to you!
If you are having problems with developing your safety function, please get in touch with Doug directly.
 “The Bathtub Curve and Product Failure Behavior (Part 2 of 2)”, Weibull.com, 2018. [Online]. Available: http://www.weibull.com/hotwire/issue22/hottopics22.htm. [Accessed: 13- May- 2018].
 German Social Accident Insurance (DGUV) – Institute for Occupational Safety and Health (BGIA), “Functional safety of machine controls — Application of ISO 13849 – 1 — Report 2/2008e”, Institute for Occupational Safety and Health (BGIA), Sankt Augustin, DE, 2008.
 “Safety Circuit Examples of Safety Components | Technical Guide | Australia | Omron IA”, Omron.com.au, 2018. [Online]. Available: http://www.omron.com.au/service_support/technical_guide/safety_component/safety_circuit_example.asp. [Accessed: 14- May- 2018].