Sensor enables nonstop safety
A
Schmersal UK product story
Edited by the Engineeringtalk editorial team
Feb 26, 2004
The innovative noncontact CSS 180 safety sensor and matching coded CST 180 actuator are designed to monitor the closed position of hinged, sliding or removable guards.
The innovative noncontact CSS 180 safety sensor and matching coded CST 180 actuator are designed to monitor the closed position of hinged, sliding or removable guards.
When used in continuous processes the CSS 180 allows machines to continue running if noncritical faults occur, while issuing a warning to the machine's control system.
This facility enables vital processes to remain operational while necessary adjustments are made.
However, if a guard door is opened the CSS 180 immediately stops the machine.
The new sensor meets Control Category 4 requirements and can be wired in series, allowing a "daisychain" up to 200m long to be created without affecting the Control Category 4 status.
The safety sensor and actuator function by the sensor producing a signal to the actuator at a predetermined resonant frequency as it approaches.
The sensor then reads back the actuator's oscillation, evaluates the frequency and its own distance to the actuator, and interprets the identification of the actuator as a closed guard.
The safety outputs are then enabled.
The CSS 180 also fulfils the requirements for proximity devices to EN60947-5-3 with the classification PDF-M (self-monitoring) and was developed using the latest IEC EN61508 standard as a guideline to ensure universal compliance to international safety standards.
It can therefore be used in SIL 3 applications to IEC61508.
The sensor and actuator are very compact with versatile mounting options, enabling them to be easily fitted in any position on any machine guard.
The noncontact units, which compensate for misalignment in a safety guard system, are also encapsulated and vibration-proof, and so are ideal for harsh, dusty or dirty environments.
They provide IP67 protection.
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