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Home Ask SafetyMan! Archive Do E-Stop circuits have to be reliable?

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Do E-Stop circuits have to be reliable? PDF Print E-mail
Written by Administrator   
Saturday, 30 May 2009 08:50

Mike Friedman, Electrical Engineer at Kaufman Engineered Systems asked:

Is it necessary to design a control reliable e-stop circuit for machine control in order to comply with ANSI and NFPA 79 standards?

SafetyMan says:

Yes. The e-stop must be controls reliable. This means the controls device (button), and the interface into the control system, (relay) must be control reliable. Whether or not it is a Category ) or 1 stop is determined by the machine requirements. Again, any failure of the components in this system must be detected and not allow the machine to start until corrected.