Select power supply. who can help?
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@JoergS5 said in Select power supply. who can help?:
I have good experience with MeanWell PSUs, 24V based
Same here. I like their UHP series, it is fanless (that is quiet), compact, stays cool, and has safety certification I trust.
https://www.mouser.com/new/meanwell/meanwell-uhp-power-supplies/
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@deckingman said in Select power supply. who can help?:
@JoergS5 said in Select power supply. who can help?:
........................- 9 motors means high power requirement like in the range 500W
How do you arrive at that statement? 200 Watts is more than adequate for my machine (excluding the bed heater) which has 13 stepper motors.
I calculated Nema 23 = 4 A * 24 V = 100 W * 9 = 900 W maximum (minus Nema 17, but some Nema 23 have more than 4 A., They will not be active at the same time, so half the value, but some reserve to be sure, because I don't know the application). But you have far more experience, so you will be right.=> calculation is incorrect, see below. There is also a good thread here to explain which I found now: https://reprap.org/forum/read.php?160,628636
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@JoergS5 said in Select power supply. who can help?:
I calculated Nema 23 = 4 A * 24 V
Steppers budget should be calculated by power not by current. A 4A stepper doesn't consume 4A from the power supply, only a small fraction of it.
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@zapta Thanks for explaining, I will change my recommendation.
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@JoergS5 Just to add that usually the rated current is also quoted at the rated voltage, which is typically something like 3.6 V. So in very simple terms, 4A at 3.6 V is 14.4 Watts ( multiplied by 9 motors =129.6 Watts) but in practice, the consumption is even less that this.
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@deckingman Thank you for the correction. Stepper usage (= printing cost) is less expensive than I thought...
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@JoergS5 No worries. By way of a bit of additional information, not long ago I fitted a 24V DC UPS with two small 12V 20AH "leisure" batteries wired in series to give 24V and which power just the printer motors, hot end heaters, and fans (but not the bed or any non-essential "accessories" such as lights). These are sufficient to run my beast of a printer for very many hours - possibly as much as a whole day and night or more.
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@deckingman I saw the thread when you described what you did and it was interesting. I thought about a flywheel solution with energy from solar modules, but flywheels loose energy very quickly, so I postponed the realisation. I still search for a low cost energy storage.
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@JoergS5
I have a 85x85cm heatbed. That needs a lot of power.
Also I have 4 nema 23 and 7 other motors (some of then will be a nema23 with 3a / maybe).After my calculation I think the following power supply is the right one.
Now, I prefer Meanwell HRP-600-24.
Can anybody just tell me if I have to connect the expansion board directly to the power supply or indirect via duet3 6h board?
Thank you all!!!! -
@barbarossa-cologne @deckingman is the better address to answer it, he has more experience. I would use one PSU for the printer itself with 200 W and a separate PSU for bed heater, controlled by a SSR. The heatbed is very big, so separation makes sense to not use current through the Duet, which must be cooled then, IMHO.
An idea for construction: myself I design a printer where I use different print beds: if I want to print a small object, I need only a small print bed, for a big one a big bed. So if you design to exchange to use a small bed if you print something small, you could spare a lot of power.
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@deckingman
Thanks. I did my calculation like you said.
Do you know to what I should give attention with the 2500 watt silicon heater?
I'm new in this world of printing and building printers.
Thanks for all answers!
