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Hey, i missed that. They must not have a common ground or connections to current from other circuits. They must be isolated. I speak for the 0-10VDC. Not for the ground of the box and the VFD ground....

Various people sell just a small charge pump board as an add on.

http://www.cnc4pc.com/Store/osc/product_info.php?cPath=23&products_id=51

1,3) As 2e0poz said, but probably 2.4A as bipolar parallel current is 1.4 times unipolar current.
2) No, floating is fine.
4) Do not put fuses between the PSU and the stepper drivers as a break in...

Gavin

Just use either of the spades for + / - on the supply, they are connected together anyway. What motors are they? better to check the spec of them first but if you have no info then better to...

The first link, M542 drivers, is ideal. Not sure if it's the cheapest - just look for 3 drivers with 542 in the part number and a suitable breakout board and you'll be fine.

The second link is...

Gavin if you wanted to just run the machine and check motors etc then the Heiz controller would probably work ok just don't push the motors to hard. There's only 0.2a difference and it's very...

You do have speed control with that board. The info sheet implies your steppers are 2.4amp per phase and look like nema 34's. From the pics we can not get a good sense of the wiring so difficult to...