Quote Originally Posted by m_c View Post
I wonder if there's something else damaged. It's a bit suspicious that everything worked before on 24V, yet now it doesn't.

Without an oscilloscope, or swapping parts, it's all pretty much guesswork. The fact the relay board got damaged before, possibly suggests the BOB might also of been damaged, and is something that only shows up at higher step rates.
Perhaps however Ive since swapped it.

Im tempted to put in another PSU but not worth spending on. I seem recall that I was pretty much on max before. The motors look fairly old, I cant find a spec for them, perhaps something else that wasnt done correctly doing the retrofit.