Increased machine safety via standstill monitor

The new SNS 4074K device type has been added to Wieland

Electric’s family of safety-oriented standstill monitors. It monitors

the pulse frequency of sensors such as inductive and magnetoresistive

proximity switches and incremental encoders, and safely

switches off the dangerous movement when the limit frequency set

on the safety module is exceeded.

The new SNS 4074K device type has been added to Wieland Electric’s family of safety-oriented standstill monitors. It monitors the pulse frequency of sensors such as inductive and magnetoresistive proximity switches and incremental encoders, and safely switches off the dangerous movement when the limit frequency set on the safety module is exceeded.

Standstill monitors protect operators of machines and systems against dangerous movement. One of the main areas of application For the trade press SPS/IPC/DRIVES 2010 November, 23– 25, 2010 Key word: SNS 4074K standstill monitor 2 Press Release: 2010-11-268 is the control of tumblers in electric locking facilities. In this case, access to a dangerous machine part is only granted when the machine movement no longer poses a risk for the operator. Two device types with different functionality are now available for safetyoriented standstill monitoring: The new SNS 4074K and the SNS 4084K. The new safety relay has a bypass input, which allows safetyoriented bypassing of the monitoring function. Device type SNS 4084K, on the other hand, has an input for the implementationof a start override, which allows electric locking facilities to be locked during machine start-up. The limit frequency to be monitored is adjustable between 0.1 and 99 Hz. It is set via two rotary switches and is permanently stored in the device via a simple configuration process.

SNS-series standstill monitors are only 22.5 mm wide, and are equipped with either pluggable screw terminals or spring force terminals. The devices can be used in safety-oriented applications up to PL e (Category 4) according to EN ISO 13849-1 or SILCL 3 according to EN 62061. They can be used with any machine drive technology, which is why they are especially suited for use as a safety-oriented retrofit in existing machines or systems.

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