My personal feeling is that it would be best to use pb3 as a shutdown signal. The fault may not be serious, but if it is (igbt gone faulty) it is better to have a defined shutdown cycle that leave everything as safe as possible. This should include forcing a reset to clear the fault.
The real question is - who gets the job of annoying Paul? I got a kid that is ideal for the job, but we are a fair bit away from him...
Regards
Dawid
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