Trapped key interlocks to PLeThe transition period for the harmonised standard EN13849-1 to replace the well known safety standard EN 954 came to a close on December 31st 2011. Designers of machine safety systems now need to start evaluating all parts of their machine safety systems for compliance with the guidelines advised in the new standard.
EN13849-1 has been implemented to ensure all parts of machine safety control systems are assessed and are suitable for purpose, based on upon reliability, diagnostic coverage and resistance to common cause failures. These criteria, which have been in the past typically applied to electrical and electronic systems, must now also be applied to the mechanical, hydraulic and pneumatic parts of machine safety systems.
Dold has designed the new modular Safemaster STS trapped key interlock system to fully comply with EN13849-1 right up to the requirements of performance level "e" (PLe), as a "standalone mechanical system", with the option of adding solenoid locking and electrical switching directly to guard doors or the control cabinet, as required.
The Safemaster STS range can achieve this as it is a modular concept which allows it to be configured to meet the requirements of a redundant system with dual inputs and diagnostic coverage up to 99%. In addition the whole range has been designed with the required level of built in resistance to common cause failures.
The system is made of AISI 316 stainless steel and utilises ergonomic pad lockable linear keys. The stackable design is extremely flexible and incorporates multi angle actuator and key entry together with several types of actuator.
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