|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
Either electrically operating devices to the contact-make principle (two conductive strips or layers are brought together when the safety mat is operated), or opto-electronic systems (a light beam is interrupted) are available on the market. Such configurations need a special evaluator for transforming and processing the output signal.