Failure at that point may be catastrophic, since by implication the primary safeguards have already failed, and thus the failure of the backup eliminates the possibility of avoiding or limiting harm. Some types of faults may occur and remain undetected until the system is used, i.e., contact blocks falling off the back of the operator device. The lack of use means that functional testing of the system doesn’t happen in the normal course of operation of the machinery, unlike an interlocked guard door for example. This could be a failure of another safeguarding system or a failure in the machine that is not controlled by other means., e.g., a workpiece shatters due to a material flaw, and the broken pieces damage the machine, creating new, uncontrolled, failure conditions in the machine.Įmergency stop systems are manually triggered and should be infrequently used. By definition, this is a situation that has not been foreseen by the machine builder or is the result of another failure. Complimentary protective measures are intended to facilitate “avoiding or limiting the harm” that may result from an emergent situation.
#Uk driving test emergency stop iso
The ProblemĮmergency stop systems are considered “complementary protective measures” in key machinery safety standards like ISO 12100 and CSA Z432 this makes emergency stop systems the backup to the primary safeguards. This article will focus on the frequency of testing rather than the types of tests. I addressed the types of tests that might be needed in another article covering Checking Emergency Stop Systems.
I’ve had a number of questions from readers regarding testing of emergency stop systems, and particularly with the frequency of testing.
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