| • AES to monitor a guard door to Control Category 3 to EN 954-1 • Monitoring one guard doors using a BNS range magnetic safety sensor. • The feedback circuit monitors the position of the contactors K3 and K4. • Start push button H: A start push button (NO) can optionally be connected in the feedback circuit. With the guard door closed, the enabling paths are then not closed until the start push button has been operated. • If neither start push button nor feedback circuit is used, X1 and A1 must be bridged. • If only one external relay or contactor is used to switch the load, the system can be classified in Control Category 3 to EN 954-1, if exclusion of the fault "Failure of the external contactor" can be substantiated and is documented, e.g. by using a reliable down-rated contactor. A second contactor leads to an increase in the level of security by redundant switching to switch the load off. |