Deja Vu All Over Again

摘要

SHOW OF HANDS: Who has learned a lesson the hard way, only to forget and relearn it again at a later date? I have joined that club many times and I recently renewed my membership. A customer contacted the EI engineering staff a short time ago with a very unique problem with one of our AC-24 Controllers. This customer is a US-based auto part manufacture that has two different wheel blast machines. One of these wheel machines was outfitted with four MagnaValves controlling the flow of media to four blast wheels. The customer complained, "The servo function on any one of the AC-24 Controllers would mysteriously turn OFF randomly." Now we have seen strange things, but this was new.