24V DC to 5V DC Power converter - Is it OK to use?

All things related to the Centroid Acorn CNC Controller

Moderator: cnckeith

jason1098
Posts: 24
Joined: Sat Dec 30, 2017 8:56 pm
Acorn CNC Controller: Yes
Allin1DC CNC Controller: No
Oak CNC controller: Yes
CNC Control System Serial Number: none
DC3IOB: No
CNC12: Yes
CNC11: No
CPU10 or CPU7: No
Location: Bixby, OK

24V DC to 5V DC Power converter - Is it OK to use?

Post by jason1098 »

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
frijoli
Posts: 595
Joined: Tue Sep 12, 2017 10:03 pm
Acorn CNC Controller: Yes
Allin1DC CNC Controller: No
Oak CNC controller: No
CNC Control System Serial Number: 1030090099
DC3IOB: Yes
CNC12: Yes
CNC11: Yes
CPU10 or CPU7: No
Location: Outside Winston-Salem, NC
Contact:

Re: 24V DC to 5V DC Power converter - Is it OK to use?

Post by frijoli »

It will probably work, but you can buy a Meanwell 5 volt supply for less money, and it WILL work.
Clay
near Winston-Salem, NC
unofficial ACORN fb group https://www.facebook.com/groups/897054597120437/
jason1098
Posts: 24
Joined: Sat Dec 30, 2017 8:56 pm
Acorn CNC Controller: Yes
Allin1DC CNC Controller: No
Oak CNC controller: Yes
CNC Control System Serial Number: none
DC3IOB: No
CNC12: Yes
CNC11: No
CPU10 or CPU7: No
Location: Bixby, OK

Re: 24V DC to 5V DC Power converter - Is it OK to use?

Post by jason1098 »

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
cncsnw
Posts: 3763
Joined: Wed Mar 24, 2010 5:48 pm

Re: 24V DC to 5V DC Power converter - Is it OK to use?

Post by cncsnw »

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.
Nick4Maker
Posts: 33
Joined: Fri Jan 12, 2018 12:34 am
Acorn CNC Controller: Yes
Allin1DC CNC Controller: No
Oak CNC controller: No
CNC Control System Serial Number: 38D26959B3D8-0103180444
DC3IOB: No
CNC11: No
CPU10 or CPU7: No

Re: 24V DC to 5V DC Power converter - Is it OK to use?

Post by Nick4Maker »

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
mikes
Posts: 94
Joined: Thu Jan 04, 2018 3:09 pm
Acorn CNC Controller: Yes
Allin1DC CNC Controller: No
Oak CNC controller: No
CNC Control System Serial Number: none
DC3IOB: No
CNC11: No
CPU10 or CPU7: No
Location: New Albany, OH

Re: 24V DC to 5V DC Power converter - Is it OK to use?

Post by mikes »

Using a DC2DC converter is completely fine.
jason1098
Posts: 24
Joined: Sat Dec 30, 2017 8:56 pm
Acorn CNC Controller: Yes
Allin1DC CNC Controller: No
Oak CNC controller: Yes
CNC Control System Serial Number: none
DC3IOB: No
CNC12: Yes
CNC11: No
CPU10 or CPU7: No
Location: Bixby, OK

Re: 24V DC to 5V DC Power converter - Is it OK to use?

Post by jason1098 »

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
BOZCNC
Posts: 3
Joined: Thu Jan 11, 2018 11:48 am
Acorn CNC Controller: Yes
Allin1DC CNC Controller: No
Oak CNC controller: No
CNC Control System Serial Number: (38D2693E7DA0-0109180486)
DC3IOB: No
CNC11: Yes
CPU10 or CPU7: No
Location: lancaster PA

Re: 24V DC to 5V DC Power converter - Is it OK to use?

Post by BOZCNC »

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
Attachments
20180208_225005.jpg
mntlvr
Posts: 58
Joined: Thu Jan 04, 2018 12:12 am
Acorn CNC Controller: Yes
Allin1DC CNC Controller: No
Oak CNC controller: No
CNC Control System Serial Number: 38D2695C831F-1228170419
DC3IOB: No
CNC11: No
CPU10 or CPU7: No
Location: Whittier,NC

Re: 24V DC to 5V DC Power converter - Is it OK to use?

Post by mntlvr »

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.
:D
mikes
Posts: 94
Joined: Thu Jan 04, 2018 3:09 pm
Acorn CNC Controller: Yes
Allin1DC CNC Controller: No
Oak CNC controller: No
CNC Control System Serial Number: none
DC3IOB: No
CNC11: No
CPU10 or CPU7: No
Location: New Albany, OH

Re: 24V DC to 5V DC Power converter - Is it OK to use?

Post by mikes »

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
Post Reply