We have some old ASCO ATS' at work and the ATS for the Fire pump has been fried twice. The circuit board for control is what is getting cooked.
Here is the scenario:
Contractor is replacing our generators and switch board #1 (main switchboard), they removed the normal source for this ATS from the switchboard and tied it directly to the secondary of our MV transformer, when they put the ATS back into Auto from by-pass the control board burns up.
Now here is the kicker, if the contractor hooks the ATS to a temporary generator (temp generator running) as normal source, everything works perfectly fine.
ASCO is onsite also and is stumped. I'm going into work now to take a look at the problem and try and figure it out. This one has me baffled but then again, I haven't seen anything yet, this is just my supervisor explaining things to me over the phone.
Any ideas are welcome at this point. When I get to work I can take pictures if necessary.