Could My Power Supply be the Culprit?

I currently have 4 Nema 34 Stepper motors 85BYGH100B-04 with a Gecko G540 and the Power Supply is a KL-600-48 input 110 14.5A output +48v 12.5 A. I lose steps on large Gcode files (3 +hours) could it be my power supply? Is my power supply large enough for the Nema 34's? Not maybe a month ago it was losing steps so I decided to buy a new Gecko and replace the power supply with an exact replacement with the one I bought the machine with. It has ran great with large files until yesterday then it started missing steps again. I cant afford a new Gecko and power board every other month. At the end of my file it is laser engraving some text and the text line drops gradually then holds good for a while then drops again. Its my Gantry motor the Slave A that keeps skipping. I have switched motor cables and the problem moves to the other motor so i don't think its my motor. I'm lost and any help would be greatly appreciated.

Is this a laser engraver you're running with those NEMA 34 motors? It seems they're oversized for that purpose. But that's probably as high-powered a power supply as the G-540 can handle. Have you looked for mechanical issues? Is the enclosure getting too hot? Issues that happen at the end of a long run can often be traced to overheating. Is the Gecko board heat-pasted to a heat sink with a fan blowing on it?

If I'm right the stepper spec sheet shows it's a 7A motor:
https://www.avidcnc.com/cdata/cad/sp...spec_sheet.pdf
Looking at G540 it says it's only a 3.5A driver.
https://uk.rs-online.com/web/p/motor...E&gclsrc=aw.ds
There's your more likely problem.

I think you need to get some new drivers that can deliver 7A at least.

Or swap out those monster motors for some smaller ones.

Its a router with a laser attachment. Yeah I have really been researching and I see that the Gecko is rated way under what the motors are rated at. I purchased the machine from a guy who built cabinets and doors so I guess thats why he had the monsters. i guess maybe my easiest and cheapest route would be smaller steppers motors. Anyhone interested in some Nema 34's ? haha ! Thanks everyone for the quick replies. Dont know what I would do without this forum.

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Originally Posted by awerby

Or swap out those monster motors for some smaller ones.

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Depends what torque is needed.
If you want low inductance, the motor amperage tends to be higher.
Even these 4nm nema 23 motors are 5A to give them a 2.7mh inductance.
https://www.automationtechnologiesin...l23h2100-50-8b
These ones are the same torque but are 5.6A to give 2.2mh. Prob one of the best for it's size class.
https://www.automationtechnologiesin...l23h2100-56-4b

This driver is still tight but would be a better fit
https://www.automationtechnologiesin...-driver/mx4660


Personally I'd ditch Gecko!!!! and either:
Get some of these to go with the existing motors:
https://www.automationtechnologiesin...driver/dma860e
And up the psu tio 60V.

Or:

Ditch the lot!!!! Get some of the 5.6A nema 23 motors above
and some of these:
https://www.automationtechnologiesin...driver/dma860e
Keep the 48v psu and see how they go. If you need more speed you can up it to 60v.

You will likely never see a failure again!.

Thanks everyone. I talked with John at https://www.automationtechnologiesinc.com/ I am going to go with these drivershttps://www.automationtechnologiesin...river-kl-8060e and this control board https://www.automationtechnologiesin...tion-cnc-board. I will keep my motors because i cut a lot of 3/4 plywood and solid oak barrel heads. Thanks again everyone.