Safety Circuit Principles

A guide on how to fault find an emergency stop circuit fault on any Stuga machine.

Difficulté

Hard Difficile

Durée

60 minute(s) minute(s)

emergency, safety, emergency stop, Guard, guardswitch, pilz, safety relay Manual-Fault_Finding_Emergency_Stop_Circuits_Screenshot_2025-01-27_142921.png

Introduction

This tutorial will layout fundmental principles on how to identify issues with an emergency stop circuit and how to use them on any Stuga machine. This will be an ongoing document which can be enhanced by different experiences and evidence of success and failure. Please feel free to add information to help yourself and your colleagues moving forward...

Attention

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Haute Tension

Étape 1 - Purpose of the Safety Circuit

A machinery safety circuit is designed to protect both the equipment and operators from harm by ensuring safe operation. It monitors critical safety functions, like emergency stops, protective guards, and sensors, to prevent accidents or malfunctions. In case of a failure or hazard detection, the circuit triggers shutdowns or alerts, ensuring that the machine operates within safe limits and reduces the risk of injury or damage.

Étape 2 - Different Types of Safety Circuits

Safety Relay Controllers: These are used to monitor safety devices like emergency stops, interlocks, and door switches. They ensure that the machine stops or enters a safe state when a fault or hazardous condition is detected. This is a hard-wired system using either a single or double channel loop and can have a feedback loop hard-wired into the system with a manual restart button.

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