Centroid Community CNC Support Forum

I'm wiring up my Acron electronics with DMM DYN4 drives and DMM AC servos at 240V AC. I currently have L1 L2 and Ground coming into the control enclosure to get my 240V AC. For my 24V DC power supply, I have purchased a 240V L1/L2/G DIN rail mounted DC power supply (Mean Well WDR-120-24 Industrial DIN RAIL Power Supply, Single Output 24VDC, 5A, 120W) which I can run off my 240V input into the cabinet. For the 5V DC power, all I have and can find is a 120V AC to 5V DC power supply. I don't want to run a separate 120V AC line into the cabinet only to power my 5V DC power supply for the 5V going to my DYN4 drives.

My question to those that know more about electronics and noise is: Would a step-down DC Power Converter be alright to use? I found plenty of 24V DC - 5V DC power converters on line, but am a little worried about noise introduction into my servo drives. Something like:

uxcell Power Converter Regulator DC 12V/24V(9V~35V) Step-Down to DC 5V 10A 50W Waterproof Voltage Convert Transformer - http://a.co/2lZv8y2on Amazon

I would appreciate any advice here. Thanks for being such a great community.

-Jason

It will probably work, but you can buy a Meanwell 5 volt supply for less money, and it WILL work.

The problem is that I can't find a 220V AC 5V DC power supply that takes a L1/L2 and Ground. Only ones I can find are L1/N and Ground and I don't have a neutral line coming to my cabinet. I already have the mean well 5V DC power supply - but i have both 120V and 240 V on my bench. I'm trying to avoid running a separate AC line into the cabinet only to supply the 5V DC power supply.

-jason

The Mean Well supplies with universal AC input (e.g. RS-25-5 and countless others) will accept 220VAC (or more, up to their input rating) across L1 and N.

N is really L2. There is no requirement that you connect a grounded neutral leg to N.

Jason,

I have the same set-up as yours, running 220V to panel (L1, L2, N & Ground). I fed my L1 & N to 5V power supply from my breaker, which will give you 110V. Others can check me, mechanical is my background, light on electrical/controls.

- Nick

Using a DC2DC converter is completely fine.

Thanks, Nick. My problem is that I didn't run a N along with my L1/L2 and G (only three wires into the cabinet.) - I'm just learning about AC voltage, and i'm still rather confused. I'm wondering if your wiring setup might cause a ground loop.... but again, this stuff is all new to me.

I'm going to try CNCSNW's post about just hooking up L1 / L2 to L1 / N on my mean well 5V PS. I ordered a 24V - 5V step-down converter as well - i'll use it somewhere if I don't end up needing it.

I'll post my results.

Thanks everyone for the comments.

-jason

I'm using one of those cheap adjustable buck converters to supply 5 volts to the gecko 203v drivers.

got 10 for $10.00. I have used them to power a raspberry pi and touch screen on another project.

blue board in the lower right

Yes a Ebay buck converter that has the current capability is all you need and use your larger SPS to feed the buck converter.
I have been using mine with no problems at all.

OR if all you are trying to do is provide signals to your drivers (enable, direction, step) you can use the 24v supply and some current limiting resistors. I'm still not sure why the prevailing opinion is that is is simpler to have an additional power supply for 5v