A good quality but cheap 48v 30A+ power supply ideal for CNC

[Lee Roberts]

Thanks for sharing !

[Jonathan]

Bought one, thank you :)

Do you want to swap yours for a suitable linear PSU (toroidal transformer wired to capacitors etc)? Seems a waste to me to use such a nice PSU for a few stepper motors! If you're interested let me know - looks like we're not too far from each other, so shouldn't have to post.

[JAZZCNC]

Do you want to swap yours for a suitable linear PSU (toroidal transformer wired to capacitors etc)? Seems a waste to me to use such a nice PSU for a few stepper motors! If you're interested let me know - looks like we're not too far from each other, so shouldn't have to post.

I would take Jonathan up on that offer because toroidal setup will be much better for use with steppers.!

[Wobbin]

Thanks Jonathan but I'll pass thanks. I agree that the Eltek is overkill for the job in hand but it will have loads of headroom and probably still be as efficient as a linear psu.

I am intrigued though by your comment Jazz - why would you feel that a linear psu would suit steppers more ?

Cheers
Robin

[JAZZCNC]

I am intrigued though by your comment Jazz - why would you feel that a linear psu would suit steppers more ?

Because the capacitors in the toroidal system handle back EMF better and chances are this supply as protection circuitry built into it to shut down if it detects back EMF which isn't what you want as steppers produce electricty when de-accelerating.!

[Wobbin]

Good point, I hadn't considered a regen situation.... we'll see what happens. I've got hold of a Axminster (Sieg) X2 which has ballscrews on the X & Y axes already, plus a set of drives and motors, just setting about sorting out the motor mounts and the Z axis bits. Just need 28 hours in the day at the moment....

Cheers
Robin

[Jonathan]

That won't be an issue with these power supplies - if it was then it's quite easily mitigated anyway.

I've got hold of a Axminster (Sieg) X2 which has ballscrews on the X & Y axes already, plus a set of drives and motors

This one I presume? The motors look like the common 3Nm ones, in which case they would run faster on 75V, but you're limited to 48V by the m542 drivers so that's not an option without replacing the drivers and power supply. Should you decide that that's worthwhile, my offer still stands. Edit: Also, take the handles of when you use it as CNC, otherwise their inertia will significantly limit the acceleration you can get.

Do you know if the output of the power supply you have is isolated? If not could you do me a favour and check it? Given the intended application, I suspect they are, but would like to be sure...The manual doesn't say.