Never being one to rush things, I've now got a toroidal transformer sitting on the bench ready to get wired up!

Specifically, this: Toroidal Transformer 625va 0-50v 0-50v --- link to Data Sheet PDF

I understand from the Data Sheet that:
  • on the Primary side, I want to wire the Grey and Violet wires together, thereby wiring it in series to handle 230Vac from UK mains,
  • the Blue wire is now 0V and the Brown wire is now 230Vac, then
  • on the Secondary side, I want to wire the Orange and Black together, then the Yellow and Red together, and
  • the Orange/Black is now 0V and the Yellow/Red is now 50Vac.


Wiring it in parallel will give me 50Vac @ 12.5A.
After being rectified this will give me 70V @ 12.5A (less voltage drop across the bridge rectifier)

Is anyone happy to cast their eye over the datasheet and confirm that I'm connecting up the right wires before this goes anywhere near the mains? The instructions look straightforward, but I've said that about lots of things that later went horribly wrong

The original drivers I was looking at from Zapp are now discontinued. The alternative (DM856) has a max supply voltage of +80, which I understand to be a comfortable margin for this PSU. The closest driver current options, however, are slightly different - 3.8A or 4.3A, whereas my steppers are 4.2A. The old PM752's would provide 4.02A as the closest fit. Is there a significant enough difference in the current provided that would make it worthwhile hunting for different drivers, or is 3.8A fine? These will now be driving an X2, which I'll be using as a stepping stone to my initial DIY design.

The good news is that I should be finished by 2016, possibly late 2015 if I pull my finger out...