70V too much for my motors?

[Clive S]

It's the drives that will limit you. So what drives are you using?

[JAZZCNC]

Like Clive says the Drives used play big part in how the current is handled. Also the Max voltage they can handle is important.
The motors will handle 70v no problem but you'll want 80V drives rather than 75v. This will give you plenty of safety margin and ensure the drives are not stressed or worse blown up thru back Emf.

So to answer your next question. The drives you want are Digital and the ones of choice are either Leadshine EM806 or AM882. Very little difference between them except the AM drives tend to be cheaper. The EM superceded the AM but in terms of performance there's not lot of difference. Em are slight smoother at lower speeds.

[sinnsvak]

Excellent! I decided to use 70V because I went with the AM882 drives. So it seems I will go ahead and order the parts for the power supply this weekend!

There will be 4 motors driven by it first, but hopefully a 4th axis will be operational after a while.

So will a 625VA be enough to supply 5 motors? My calculation is as follows:

625/50=12.5A

4.2A ea motor * 5 = 20A. Assume I need only supply 60% of the power needed: 0.6 * 20A = 12A

[Clive S]

I think you will be fine with that you might need a D rated MCB though to cope with the inrush current

[sinnsvak]

I think you will be fine with that you might need a D rated MCB though to cope with the inrush current

Yeah, I found this page, that simulates that.
http://www.changpuak.ch/electronics/...ply_design.php


Not sure how accurate it is, but it tells a picture of how its going to work?