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Protecting dangerous machine or system movements

26 April 2010

Designed for maximum safety and efficiency, Wieland Electric's SNS 4084K Zero-Speed Monitor protects against dangerous machine or system movements. This safety relay, exhibited at the Hannover Messe, monitors the pulse frequency of sensors, such as inductive proximity switches or incremental encoders, safely switching off any dangerous movement when the limit frequency set on the device is exceeded.

Protecting dangerous machine or system movements
Protecting dangerous machine or system movements

The Zero-Speed Monitor can also control locking bolts in electric locking facilities, where access to a dangerous machine parts is only provided when the machine movement is no longer a risk for the operator. Particularly suited to safety- oriented retrofits in existing machines or systems, this versatile device can be used with any machine drive technology.
The limit frequency to be monitored is adjustable between 0.1 and 99 Hz and is set via two rotary switches; this is stored permanently in the device via a simple configuration process. Wieland's Zero-Speed Monitor also has inputs for the implementation of a restart inhibit and a start override. This enables an electrical locking facility with locking bolts on a dangerous machine to be safely and easily controlled, even without a PLC.
Designed for use in all routine industrial applications where man and machinery interface, it combines superior technical performance with compact dimensions of only 22.5mm in width. The Zero-Speed Monitor is supplied with either pluggable screw terminals or spring force terminals and can be used in applications up to PL e (Cat 4) according to EN ISO 13849-1 or SILCL3 according to EN 62061. Wieland’s wide range of safety switching devices cover all important safety functions whilst satisfying customer's complex requirements.


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