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Heavy duty transponder-coded safety switch with guard locking

08 May 2022

Featuring a robust, IP69K rated construction and class-leading guard locking force up to 8,000 N, the CTA range of safety switches from industrial safety engineering specialist Euchner can, when combined with an Euchner IO-Link Gateway, communicate and send process and device data – including comprehensive diagnostic messages and information on preventive maintenance – to higher-level control systems to enable rapid and targeted troubleshooting. 

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Being Industry 4.0 ready and ideally suited to applications requiring a high Performance Level (PL) and increased locking force, CTA switches combine the convenient form-factor of Euchner electromechanical safety switches but with guard locking and modern transponder-coded safety engineering. Thanks to the transponder technology, a single CTA meets the requirements of BS EN ISO 14119 and achieves category 4/PL e according to BS EN ISO 13849-1 without additional fault exclusion. Special versions are also available for connection directly to decentralised peripheral systems, e.g. Siemens ET200pro. 

The robust metal housing and head of the CTA ensures a high degree of protection to IP65/IP67/IP69/IP69K, making it suitable for harsh, dirty environments and an ideal all-rounder for almost every industrial use. Its 8,000 N guard locking force is over 4x that of competitor solutions which, coupled with four actuator approach directions and an integrated, funnel-equipped head for improved actuation, makes the CTA reliable and effective for securing safety doors and flaps on machines and systems. This makes it suitable for both process protection and the protection of personnel thanks to integrated guard locking and guard lock monitoring. The design of the head is also particularly advantageous on unstable guard door designs or where the guard isn’t adjusted. 

Consisting of two components – a safety switch and separate actuator – and with a range of mounting bracket solutions available, the 40mm-wide compact design of the CTA can be mounted either vertically or horizontally and fits perfectly on standard aluminium extrusion profile systems, including those of Bosch Rexroth and Kanya, with the switch mounted on the fixed part of the guard and the actuator on the movable part. 

When the guard is closed, the actuator engages into the safety switch head. The safety outputs are switched on if the integrated transponder chip in the actuator is detected and the guard locking activated. Thanks to the integrated prevention of inadvertent locking position (faulty closure protection), unintentional activation of the safety outputs is prevented if the actuator is not completely inserted into the head.

The CTA enables comprehensive diagnostic information to be forwarded to the control system, with the safety switches measuring and supplying process-relevant parameters and information on preventive maintenance measures in real time to ensure potential issues are indicated before a machine failure can occur. Diagnostic information includes the number of switches/units in the chain, number of switching cycles (for preventative maintenance and Industry 4.0), the code of actuator presented and code of taught actuator, voltage and temperature. When IO-Link Gateways and ESM-CB safety modules are coupled to the CTA, process and device data can be read from each switch and provided to the control system via IO-Link. 

The IO-Link Gateway can be used to read process and device data relevant to control from a standalone safety switch or safety switch chain, with the data transmitted in real time to the IO-Link master, representing clear added value in terms of preventive maintenance. Offering triple functionality, the ESM-CB safety module combines an evaluation unit, safety relay and IO-Link slave in a single, compact device measuring just 18 mm wide. For this module, two safety circuits can be connected to the input side, with equipment including an emergency stop chain and mechanical safety switches being connected to one safety circuit. The second safety circuit enables the connection of Euchner safety switches from the BR/BP ranges.

For applications requiring multiple switches, the BR version of the CTA allows up to 20 safety switches to be connected. For series connections, all information regarding the status of individual CTA switches is forwarded directly to the control system. Alternatively, for series connection in the field, wiring via M12 and Y-distributors or a passive distribution module allows all safety and status signals to be collected and forwarded to the control system using one cable. A BP version is also available for standalone operation.

The CTA can be fitted with an extensive range of optional accessories – mechanical releases, pre-assembled cables or different bolt assemblies, actuators or mounting bracket solutions – including a flush fitting rear escape release, which is retrofittable and ideal for walk-in applications. It can also be coupled with other Euchner safety solutions, including non-contact interlocks and its Multifunctional Gate Box (MGB2), all in the same safety chain and maintaining a Performance Level of PLe.

For further information on the CTA safety switch visit, email or call the Safety Technology Centre on +44 (0)114 256 0123. 

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