1747-L53 A-B  Circuit Board

Safety relays are becoming a popular component in safety systems, due to increasing regulations and attempts to safeguard operators from hazards. When applied correctly, safety relays will detect failures in output and input devices, as well as internal failures, allowing power to be removed from a load, even if a contact is welded, and prohibit a subsequent restart of the load until the failure is corrected. Safety relays are just one component in the safety control system. All components in the system must be chosen and applied correctly, to achieve the desired level of operator safeguarding.

Additional Literature for Safety–Related Issues: • Understanding the Machinery Directive, publication SHB–900 • A Global Reference Guide for Reading Schematic Diagrams, publication 100–2.10 • Industrial and Safety Relay Selection Guide, publication 700–1.9 • Safety Relay Color Overview, publication 700–1.13 • Modular Control System, publication 100C–1.0.1 • Safety Interlock and Cable Pull Switches Color Overview, publication 802SS–1.0 • Stack Light Selection Guide, publication 855T–1.0 • Flexible Solutions In Control and Load Switches, publication 194–1.01 • 30mm NEMA Style Push Button Selection Guide, publication 800–1.2 • 22mm IEC Style Push Button Selection Guide, publication 800E–1.12  A safety relay: • Is designed with an internal circuit that will allow power to be removed from a load even if an internal contact welds. • The internal circuit is redundant and self–monitoring, using multiple, positive–guided relays. • Monitors faults in the safety relay, and the input (e.g. Start and Stop Buttons) and output (e.g. Auxiliary Relay) devices. • Typically replaces the relay (often a master control relay) that interfaces between input devices and contactors or starters. • Can be ordered with different numbers of contacts, like any other relay. • The contacts are called “monitored outputs” or “safety outputs”, and have two or more contacts in series to achieve redundancy for each load (refer to figure 1). • Is designed to meet requirements for safety categories as outlined in European Norm EN 954 and EN 574.

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