Standstill monitors offer protection for machine operators

12 August 2011

Wieland Electric has increased its range of standstill monitors with the addition of the new SNS 4074K. The new device monitors the pulse frequency of sensors, such as inductive and magneto-resistive proximity switches and incremental encoders, safely switching off any dangerous movement when the limit frequency set on the safety module is exceeded. SNS Series standstill monitors measure only 22.5mm in width and are equipped with either pluggable screw terminals or spring terminals.

Wieland now offers two such devices with different functionality, the SNS 4074K with a bypass input which allows safety orientated bypassing of the monitoring function and the SNS 4084K which has an input for the implementation of a start override that allows electric locking facilities to be locked during start-up. The limit frequency to be monitored is adjustable between 0.1 and 99Hz and is set via two rotary switches. This is permanently stored in the device via a simple configuration process.

The devices can be used in safety applications up to PL e (cat 4) according to EN ISO 13849-1 and can be used with any machine drive technology. Wieland’s standstill monitors are also suitable for retrofit into existing machinery or systems.