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| Specifications | |
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| Content | If they are used in conjunction with machines, then just like all of other electrical equipment of the machine, they also come under the Machinery Directive 98/37/EC. Emergency Stop This is an action in an emergency, which is defined to stop a process or movement which would otherwise have potentially hazardous conse- quences (from EN 60204-1 Annex D). Further, the following is defined in 9.2.5.4.2 of EN 60204-1: Stopping In addition to the requirements for Stop (refer to 9.2.5.3), the following requirements apply for an Emergency Stop: •This must have priority over all other functions and operator actions in all operating modes; •The power to the machine drive elements, that could result in a potentially hazardous condition or potentially hazardous conditions, must be disconnected asquickly as possible without creating other hazards(e.g. using mechanical stop- ping devices, that do not require an external supply, using counter- current braking for stop Category 1); •A reset may not initiate a restart. Stopping in an emergency must either be effective as a Category 0 or Category 1 stop (refer to 9.2.2). The stop Category in an emergency must be defined as the result of the risk evaluation for the particular machine. To technically implement Emergency Stop corresponding to the recommend- ed application in the Foreword of EN 60204-1, either the requirements spec- ified in EN 60204-1 or in EN 954 and IEC 61508 can be applied. EN 60204-1 Edition 4 specifies the implementation predominantly using electromechani- cal components. The reason for this is that “basic” (pro- grammable) electronic systems are not sufficiently safe. By correctly applying EN 954 - and if required IEC 61508 - electronic and programmable electron- ic components are functionally safe so that they can also be used to imple- ment an Emergency Stop function for all categories. The Emergency Stop function specifica- tions will be updated with Edition 5 (this is expected in 2005). In the final draft of 2004 (the final Edition was still not available at the time that this doc- ument when to print) the following statement applies: The Emergency Stop shall function either as a Category 0 stop or as a Category 1 stop (see 9.2.2). The choice of the category of the Emergency Stop depends on the results of a risk assess- ment of the machine. In addition to the requirements for stop (see 9.2.5.3), the Emergency Stop function has the following require- ments: •It shall override all other functions and operations in all modes; •Power to the machine actuators that can cause a hazardous condi- tion(s) shall be either removed immediately (stop Category 0) or shall be controlled in such a way to stop the hazardous motion as quickly as possible (stop Category 1) without creating other hazards; •Reset shall not initiate a restart. This new formulation means that there are no longer any restrictions stating that hard-wired, electromechanical equipment must be used to implement safety-related functions. Devices for EMERGENCY SWITCH- ING-OFF and EMERGENCY STOP Devices that are used to stop equip- ment and machinery in an emergency must be provided at every operator control location and also at other loca- tions where it may be necessary to ini- tiate a stop in an emergency (excep- tion: operator control stations which are not connected through cables). In order to fulfill the protective goals, specified in EN 60204-1 as well as EN 418, the following requirements apply for both functions (also refer to 10.7 in EN 60204-1): •When the contacts switch, even when briefly actuated, the command device must positively latch. •It is not permissible that the machine can be restarted from a remote main operator station without the hazard having first been removed. The emer- gency switching command must be released locally in the form of a con- scious operator action. 16Safety Integrated System Manual 1 – Regulations and Standards |
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