Safety Relays with Diagnostics
If there is an emergency situation in a process plant, a quick response is needed. Sirens, warning lights, or active cooling systems must be activated safely in line with the "energized to safe" (ETS) procedure, while motor controls or emergency shut-down valves are switched off according to "deenergized to safe" (DTS). To ensure safe signal transfer, Pepperl+Fuchs is setting a new level of reliability with newly developed safety relays. With triple redundant switching contacts, the interface module from the tried-and-tested K-System provides reliable and safety-related activation and deactivation for applications in accordance with IEC61508 up to SIL 3.
The 1oo3 architecture—connected in series in DTS applications and in parallel in ETS applications—ensures maximum availability of the safety function after failure of up to two contacts. This provides a safety-relevant advantage compared to force-guided contacts: If a contact on a force-guided relay fails, this can merely be detected and the actuator is not switched on or off. Additional wiring for evaluation channels in the control panel—with the associated effort and costs—is required to feed back information on the position of the switching contact. The new safety relay with 1oo3 architecture thus ensures higher reliability while also featuring easier handling.
As part of the tried-and-tested K-System, the newly developed safety relays are based on 25 years of know-how and successful application in the process industry. With over 200 isolated barriers for explosion hazardous areas and around 150 signal conditioners for use in safe areas, the K-System offers the widest range of products of this kind for different signal types and applications. It is characterized by cost-effective mounting on the Power Rail, a high level of availability, and ease of maintenance. Removable terminals allow quick exchange of the safety relay in the case of a fault without having to disconnect the wiring. Find the right solution for your specific application!
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