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E-Stop

Discussion in 'Wiki' started by derekleffew, Sep 13, 2008.

  1. derekleffew

    derekleffew Resident Curmudgeon Senior Team Premium Member

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    Emergency Stop. A safety switch that will, when actuated, overrides all other control signals to bring a system to a stop . Sometimes called a "mushroom button" due a typical shape. Many systems include more than one, ideally at convenient locations. An E-Stop should bring the system to a stop as rapidly as possible without creating additional hazard.

    NFPA 79: Electrical Standard for Industrial Machinery is helpful in understanding the specific requirements for an Emergency Stop:

    Note that as 9.2.5.4.1.3 implies, it may not be prudent to execute an emergency stop by simply cutting power to a system.

    The requirement of 9.2.5.4(2) is often met by using buttons that mechanically latch in the active position, and require a positive action to reset (ie, twisting the button cap), such as this example:

    [​IMG]
    Pushbutton Switch, Red, 40 Millimeters Emergency Stop Mushroom Head, Turn to Release
     
    Last edited: Feb 8, 2009

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