Sick MOC3SA speed-monitor relay

Sick’s MOC3SA speed monitor is part of the company’s sens:Control safe control range, and is designed for the safe monitoring of drive rotational speeds. The monitor meets the safety levels of PLe according to EN ISO 13849, SIL3 in compliance with IEC 61508 and SIL3CL according to EN62061. Typical applications include the speed-dependent release of mechanical door latches during machine operation or the operation of drives with safely reduced and monitored speeds, such as in maintenance or set-up modes.

The speed monitor allows the simple, flexible and economical monitoring of safe stops and safe rotary speeds of drives. The large number of differing operating modes permits cost-optimised adaptation of the monitoring solution to the particular safety level. The best operating mode for a particular use is automatically suggested by the design aid software tool - useful for project planning. Configuration is then easily undertaken via two rotary switches on the module housing. The speed monitor also supports a wide range of sensors and signals - including ‘non-safe’ - so that the same motion control module can always be used regardless of the sensor involved.

The device permits the monitoring of mechanical door latches on palletisers, processing machines or transfer stations between handling systems or robots and persons. It is also suitable for the operation of a drive during maintenance, set-up or testing, in order to safely reduce and monitor the drive speed during these operating modes. More complex tasks, such as monitoring deceleration requiring a controlled stoppage of the drive, can also be implemented.