
Originally Posted by
petersonra
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Incidentally I don't believe that the relay is stuck either. If it was stuck it would stay stuck. My guess is that something is maladjusted or just wasn't done correctly in the first place. A lot of safety circuits are horribly done by people who don't really understand what they are supposed to accomplish.
Amen to that... In other parts of the world where these systems are MANDATORY, there are technicians who specialize in it, because it is a lot to know and learn all by itself. Here in North America, where it is NOT mandatory, it is often handled by general electricians who may or may not have the training and expertise to do it correctly.
But the other aspect of this that bothers me is the "robot mfr." not being able to diagnose and fix this issue. SOMEONE would have had to do a very thorough and official Safety Evaluation on the system as a whole, and PART of that process is a detailed study of what can go wrong and how to avoid it. So I still doubt this is a hardware failure issue, I think it is a procedural issue. Someone is doing something in the incorrect sequence and they are not getting the proper instructions as to HOW it should be done. THAT responsibility lies directly at the feet of the robot mfr. in my opinion.
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Many people are shocked when they discover I am not a good electrician...
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