this is relation to friends mill , a fortis machine thats grid tied with an Aurora invertor
he wants to incorporate a secondary voltage monitoring circuit using an omron v sensing relay to trigger a secondary dump system ( belt and braces kind of thing )
the omron is set up to detect grid failure and/or mill overvoltage ...that bit seems fair enough
but on the subject of redundancys , what are the chances of the invertor rectifier failing in such a way that it might allow a ac surge through to the invertor ?
i,ve had some small home made rectifiers fail but they usually went short circuit , which generally is just like a short circuit to the mill ....(the ac gets fed back into the mill ?)
he,s trying to keep all his bases covered as its a 4k machine which will be left unattended for periods of time .....
i,m kinda curious if a failed rectifier can let pure ac through ...