BS 869:2006 pdf download – Safety of machinery — Safety requirements for pressure metal diecasting units 5.2.3 Guards for the die closing mechanism area Access to the die closing mechanism area shall be prevented by interlocking movable guards. The movableguards shall either a)be interlocked with the power supply for the dangerous movements (e.g., switch off the hydraulic pump and release the pressure of the accumulators).The relevant part of the control system shall have a safetycategory of not less than 1 in accordance with EN 954-1.Restarting the machine shall only be possible ifthe guard for the closing mechanism area is closed; or b) be interlocked with the control system.Opening of the guards shall stop all dangerous movements. The relevant part of the control system shall have a safety category of not less than 3 in accordance withEN 954-1.Restarting the dangerous movement shall only be possible if the guard for the closingmechanism area is closed.Movements of the ejector system with guard open are allowed, if, 1) for machines with a clear vertical distance between the tie bars up to 1 200 mm, the dangerousmovements are restricted as stated in 5.9.2; 2) for machines with a clear vertical distance between the tie bars greater than 1 200 mm,the conditions of 1) shall be fulfilled and additionally the speed of the ejector shall be reduced to 30 mm/s.The parts of the control system related to the speed reduction shall be at least category B inaccordance with EN 954-1. Fixed guards can be used for the die closing mechanism area if no frequent access is required (e.g, accessless than once a shift, according to EN 953:1997;6.4.3.1). 5.2.4 Additional requirements for movable guards and access doors 5.2.4.1 General Movable guards and access doors,see 5.2.5, shall be interlocked with the control system in such a mannerthat 5.2.4.2Closing movements of the die and positioning movements of core pullers can only be initiated ifthe movable guards for the die area and for the die closing mechanism area and the access doors are closed. The opening movement of the platen with the die area guard open shall only be possible if it is impossible toreach in these conditions the crushing and shearing points behind the moving platen. 5.2.4.3 Ejector movement shall only be possible with the guards for the die area closed. 5.2.4.4 Deviations from the requirements of 5.2.4.2 and 5.2.4.3 (see also 5.10 of EN 954-1:1996) areallowed and the...
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