|Haake Buffer||bumper, buffer, personnel safety systems, bumber, bumper EN 954-1, safety cushion, safety bumper, bumper DIN ISO, bumper security category 3, bumper security category 4, safety cut-off, collision cushion, area bumper, ring bumper, safety contact bumper, safety buffer|
|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. The bumper sensor is are built up of mechanically opening N/C contacts connected in series, in the form of a contact chain. Current conducting contacts rollers and insulating intermediate elements (wedge rollers) are alternately lined up on an expander cord. By pre-tension, 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 roller 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 anyway needed for the E-stop button. Note: Wiring of the contact chain is performed in an identical way as of an E-stop button||
Example for safety buffer
|safety bumper||safety buffer
An often critical feature for any electrical component, of course for safety edges, too, is sealing. Ingress of humidity or water may lead to failures. Critical for sealing, in a safety edge, is the interface between rubber profile and end caps being normally glued to each other.