We had a similar problem when I worked for a Pharmaceutical company. The big Diosna granulating machines would often trip if the load inside got too high. The only solution was to open the front panel with a '69' key (the name for the key for some reason).
The problem was the engineers were the only ones 'allowed' to have them - something to do with going on strike and having a hissy fit if anyone else did their job.
The next issue was that what was inside needed wetting and processing quickly before it got to the point where it would have to be chiselled out. And engineers seemed to spend about 80% of their working day on cigarette breaks (aka hiding somewhere outside, round back).
Once opened, there was a standard circuit breaker that needed flipping. That was all they ever did.
No one could ever explain to me why WE had specced such a low trip threshold. But the best bit was when I got hold of a '69'.
Biting the hand that feeds IT
