Treotham supplies a new line of zero-speed monitors from Wieland Electric designed to protect the operator from dangerous machine or system movements in industrial environments.
The safety-oriented Wieland Electric SNS 4084K zero-speed monitors incorporate safety relays that monitor the pulse frequency of sensors such as inductive proximity switches or incremental encoders.
When the limit frequency set on the device is exceeded, the safety relay safely switches off the dangerous movement.
Additionally, zero-speed monitors can control tumblers in electric locking facilities. In this application use, access to a dangerous machine part is only granted when the machine movement is no longer considered a risk for the operator.
The safe zero-speed monitors can be used with any machine drive technology, making them especially suitable as a safety-oriented retrofit in existing machines or systems.
The limit frequency to be monitored is adjustable between 0.1 and 99 Hz, which is set via two rotary switches and permanently stored in the device using a simple configuration process.
The machine safety devices also have inputs for a restart inhibit and start override, allowing the zero-speed monitors to easily control an electrical locking facility with tumbler on a dangerous machine without a PLC.
Zero-speed monitors are compact safety devices measuring only 22.5mm in width and come with pluggable screw terminals or spring force terminals.
The device 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.