Hi guys this seems to be a very common fault where the PSR stops the spindle from increasing in rpm.
Does it indicate any particular part ie capacitors or thyristor fault. I'm thinking capacitors i have 2 PSR units that are broken and I am hoping to get one of them working.
One has a pretty damming fault where it arcs up across the main DC buss and the other has the above mentioned fault. The DC bus arc unit i have put to one side for now because its in a bit of a mess. I know that the fault is PSR because it came from a mill that also had the same problem.

any advise would be much appreciated