Ok just got the multi meter on the Transformer so i know where im going, atnd im getting 26.76vac using a single winding and 53.6vac using two windings and 80.1vac using three, so if i use the calculations provided by Jonathan of X*1.41 -1.1 to show the rectified Voltage
I will be Using the forth winding else where..
So there is a start
RickAlways bear in mind that your own resolution to succeed is more important than any other - Abe Lincoln
Just wanted to say thanks to you guys on this thread for helping me out with my power supply build. I managed to pull a good case out of the skip at work which I chopped and changed to suit. I used a 750KVA 0-25 0-25 transformer in the end in case I ever add a 4th axis. Wired the two secondaries in series and through a bridge rectifier and a couple of 80v rated capacitors. All working smoothly, giving a nice smooth DC output of circa 75v. I do still need to add a fuse on the output of the secondary, just waiting for the fuse holder to arrive from Farnell and It'll be complete. I've tried it with a couple of my DQ860MA drivers and all working very nicely indeed. Thanks again.
Re the caps. 80V rated might be a bit low !! I would suggest at least 100V for safety.
Good advice, I did think it was a little close but I had them to hand, I'll get a couple rated at 100v to replace them eventually, thanks Clive.
Yes I forgot to say if you have never seen one blow up, the mess they can make in unbelievable !!
one suggestion, it may be a bit late, and i'm no electronic expert. Most systems i've converted have a transformer for the drives and a seperate one for the logic.
There must be a good reason for this as transformers are both heavy and take up valuable space.
Seperate supplies is more a commercial controller thing. You want to be able to kill the movement without killing the controller, just like with Mach/LinuxCNC, you want to kill the machine without killing the computer.
Some will use a seperate supply for the break-out board, as the BOB needs power and it's easier/tidier than trying to get 5v from the computer.
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