Contact Chain, design and mode of operation of the Haake Contact Chain

As a general rule applies:

Machinery and devices presenting dangerous movements must be provided with an emergency stop device. This device is monitored by a suitable safety relay unit.

Our safety edges are built up of mechanically opening N/C contacts connected in series, in the form of a contact chain. Current conducting contact rollers and insulating intermediate elements (wedge rollers) are alternately lined up on an expander cord. By pretension, the contact rollers are pressed together, and the current circuit is made.

Actuation of the safety edge leads to at least one pair of the contact rollers to separate by action of the wedge-shaped intermediate elements, and the current circuit is broken.

Due to the positive break of the supply, transformation of the output signal is not required, since a circuit interruption signal is directly available. This signal is fed to the safety relay unit already needed for the E-stop button.



Saftey egdes HSC: Contact Chain

Note: Wiring of the contact chain is performed in identical way as of an E-stop button.

safety edge

Immediate switching - large over-travel!