Elevator brakes now available with contactless release monitoringThe latest innovation from Mayr for elevator brakes is release monitoring. This prevents unpermitted operating conditions such as for example starting up against a closed brake. Mayr now provides a contactless system with a proximity sensor for its elevator brakes as an alternative to the tried and tested release monitoring system with microswitches.
As there are no mechanical parts involved, the lifetime of this new, contactless release monitoring system is not dependent on the switching frequency. The system is magnetic field resistant and works absolutely reliably and wear-free. It is also resistant to impacts and vibration, as there are no movable parts, and the electronics are completely encapsulated. Other advantages of the proximity sensor are the high switching point repetitive accuracy, the low hysteresis and the low temperature drift.
The switching bolt for the proximity sensor is installed at the factory and is, in contrast to the release monitoring system with microswitch, not adjustable. Application errors through adjustment of the switching point position are eliminated. This also plays an important role in maximising functional and operating safety.
The contactless release monitoring system can be designed as an NO or NC contact. With the NC contact, the 'high' signal is generated if the brake is switched when de-energised. Here the armature disk drops and the brake closes. Any breakage of the sensor cable is recognised when the brake is closed.
With the NO contact function, the 'high' signal is generated if the brake is energised and the armature disk releases the rotor, and the brake is released. Only on generation of the 'high' signal is the motor enabled for start-up. This reliably prevents the motor starting up against a closed brake. Cable breakage is recognised when the brake is open.
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