| 摘要 |
<p>A safety cut-off system for an installation consisting of machines which are designed for interaction has a machine cut-off level (10) in which a dedicated cut-off circuit is allocated to each machine (12a-12h), a zone cut-off level (20) in which cut-off zones can be cut off which consist of groups of associated machines, and a system cut-off level (30) which is allocated to all the machines (12a-12h) in the installation. The cut-off circuits each have an electrically operable switching element (16a-16h) which is connected via safety circuits (13a-13d) to a main box (24) for central control of the safety cut-off system and, through said box, to a power supply (100). The safety circuits (13a-13d) have operable tripping elements (22a, 22b, 32a) at the zone cut-off level (20) and at the system cut-off level (30), are designed as latching circuits and are passed through by the main box in which they can be selectively linked with one another by means of a switching matrix such that groups of associated machines are cut off when one of the tripping elements is operated. In order to connect an additional machine to the safety cut-off system, it is necessary only to connect the cut-off circuit of this machine to the main box (24) via an additional latching circuit. There is no need for any other change to the wiring of the installation since the additional machine is linked to the safety cut-off system in the switching matrix of the main box (24). <IMAGE></p> |
