Is this psu too much power for my setup

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is this psu too much power for my setup MEAN WELL LRS-350-12 Switching Power Supply 348W 12V 29Amp Single Output (LRS Series 350W 12V Running 4 Channel 5v Relay Shield, [Stackable SD Card TF Card Micro SD Card Card ReaderShield and the cnc shield on a uno. The relay turns on plasma trigger. my setup is yyxz z axes is for torch height drv8825 stepper drivers https://youtube.com/shorts/ff3_7n_1mLw?si=Vl74pjjk26P19WWs

2

12volt is too much for an Uno that powers a 5volt relay shield.
12volt might not be enough for the unspecified stepper motors.
Too much power (current) of the supply is irrelevant.
A load only takes what it needs.

If you want exact answers, then post a wiring diagram with web-links to parts.
Leo..

3

so the shield. is 12 -36 volts and the uno is 7 volts if i run 12 volts to the cnc shield will it power the uno threw the onboard regulator on the uno

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can i step down the voltage with a XL4015 5A DC-DC Voltage Step Down
Buck Converter LM2596

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With 12volt on V-in or the DC socket of an UNO R3, you van only safely draw about 100mA from the 5volt pin. That's just OK for a single relay (~75mA) but not OK for four relays (300mA).
Yes. you can use a buck converter to 5volt to power the 4-relay module , and the Uno on the 5volt pin. Make sure you disconnect the Uno from that supply when connected to USB.
A 24volt supply could enhance your CNC performance.
Post a wiring diagram, so we can check.
Leo..

6

Add some fuses...
29 A will act like a welding machine if you make a short.
A wire will turn into a candescent light bulb.
This may set your house on fire...

7

what would you recommend for a psu for the cnc shield

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or at least a fuse

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build links

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It seems you have these motors.
I would use a 24 volt supply for the motors. And a separate 5volt USB supply for the Arduino and relays.
Leo..

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there 2.4 volts max not 24 volts there 3d printer stepers from my tronxy po8ma something

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It seems you don't understand how a current controlling driver works.
Leo..

1 Like
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multi meter screwdriver and ground to the pot

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i only put together 3d printers no experience with driver shields external drivers i know how to upload code using ide built a few 3d printers using the rumba plus boards

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can you recommend a mean well psu for me

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bought this

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or can i use a 12 to 24 volt buck converter and use the same psu and a 12 to 5v buck for the uno

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Another problem I see is the relay shield. You can rarely use two shields on top of each other without getting in trouble with Arduino double pin use.
You can use that 12volt supply for the motors, but expect slower performance than with a 24volt supply. 24V/6A should be enough for three motors.
Leo..

19

[quote disconnect the Uno from that supply when connected to USB im using the usb to power and run the kindle for cnc controlor using Grbl Controller app https://apkpure.com/grbl-controller/in.co.gorest.grblcontroller

20

Another option is to power the Uno wit 7volt on the DC socket.
But that may flow back into the USB socket of a fake Uno.
Many fake Unos have a broken USB backflow protection.
Leo..