jraef
Member
When disassembling something, take notes!
I had to play the part of a field engineer once on some Medium Voltage Soft starters that had shorted SCRs. I had never done it before, but I had confidence (too much?) in my ability to figure it out as I went. Long story short, there is an orientation involved in re-assembling them back into the heat sinks. I had a 50:50 chance of getting it right, I lost and shorted the NEW set of SCRs, forcing me to pay for flying out the replacements and costing the end used another day of down time. Had I paid close attention to them during disassembly I would have noticed the orientation, but I was in a hurry because it was an absolutely miserable place (meat rendering plant) but of course because of my haste fueled mistake, I had to spend ANOTHER day of my life there...
I had to play the part of a field engineer once on some Medium Voltage Soft starters that had shorted SCRs. I had never done it before, but I had confidence (too much?) in my ability to figure it out as I went. Long story short, there is an orientation involved in re-assembling them back into the heat sinks. I had a 50:50 chance of getting it right, I lost and shorted the NEW set of SCRs, forcing me to pay for flying out the replacements and costing the end used another day of down time. Had I paid close attention to them during disassembly I would have noticed the orientation, but I was in a hurry because it was an absolutely miserable place (meat rendering plant) but of course because of my haste fueled mistake, I had to spend ANOTHER day of my life there...