Author Topic: power supply enclosure  (Read 5362 times)

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Online coppercone2

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Re: power supply enclosure
« Reply #25 on: April 27, 2019, 06:19:16 pm »
nah thats too new, its already become cheapened. if they smashed the old one they woulda used a pick axe or a sledge and it woulda been ripped
 
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Offline LaserTazerPhaserTopic starter

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Re: power supply enclosure
« Reply #26 on: May 02, 2019, 01:33:16 am »
Do desktop brick type supplies such as these https://onlinemeanwell.com/en/gs280a20c4p-319.html need any kind of ventilation?

They are probably higher in efficiency and make less heat. Its also far less cumbersome than making panel cutouts for power entry modules and selecting appropriate fusing. These supplies are also much smaller and less hazardous to work with - they are also quite immune to infiltration of liquid and dust.
« Last Edit: May 02, 2019, 01:39:01 am by LaserTazerPhaser »
 

Offline exe

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Re: power supply enclosure
« Reply #27 on: May 02, 2019, 07:30:45 am »
Do desktop brick type supplies such as these https://onlinemeanwell.com/en/gs280a20c4p-319.html need any kind of ventilation?

Good question, I'd say it depends on the load and efficiency. My experience is, my laptop charges become hot when placed under the pillow. Would it work in a particular scenario I don't know, I propose to measure the ambient temperature. The devices you posted has a nice datasheet showing derating curves (power output vs ambient temperature).
 
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Offline LaserTazerPhaserTopic starter

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Re: power supply enclosure
« Reply #28 on: May 02, 2019, 09:27:07 pm »
Recently obtained 2x of GS280A12-C4P they should be fine to 100% load to 35c ambient issue is locating a receptacle which fits and can handle the current it outputs.
 

Offline exe

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Re: power supply enclosure
« Reply #29 on: May 03, 2019, 06:50:50 am »
When doing temperature measurements be sure to wait enough time for temperature to set. It's recommended to wait at least 15 minutes to do final measurements (but the temperature should be monitored all the time to avoid overheating). Also room temperature plays a big role. 18C in the winter is not the same as 33C during hot summer.

If possible, I'd add some thermal protection circuitry.
 

Offline beanflying

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Re: power supply enclosure
« Reply #30 on: May 03, 2019, 06:55:32 am »
When doing temperature measurements be sure to wait enough time for temperature to set. It's recommended to wait at least 15 minutes to do final measurements (but the temperature should be monitored all the time to avoid overheating). Also room temperature plays a big role. 18C in the winter is not the same as 33C during hot summer.

If possible, I'd add some thermal protection circuitry.

Giggle we hit 45C here this Summer and a bunch over 40C  ;)

On topic some of the power bricks I own including 'branded' ones do get what I consider over hot I have substituted one on a Netgear Storage Box. The best solution is always Airflow over the power bits on any supply be it natural or fan forced..
Coffee, Food, R/C and electronics nerd in no particular order. Also CNC wannabe, 3D printer and Laser Cutter Junkie and just don't mention my TEA addiction....
 

Online coppercone2

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Re: power supply enclosure
« Reply #31 on: May 30, 2019, 04:52:02 am »
don't make it like dave jones contactor on the roof that just broke
 

Offline Emil

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Re: power supply enclosure
« Reply #32 on: June 03, 2019, 10:28:06 am »
Why not anneal PLA: it shrinks :(. I didn't do it myself, but I watched videos, dimensional accuracy suffers a lot. It also shrinks differently in different axes.

Dimensional change is different along the Z-axis compared to X and Y.

The dimensional change is very consistant, so you can print a test piece, measure it and then scale future prints accordingly in the slicer.
 

Offline exe

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Re: power supply enclosure
« Reply #33 on: June 04, 2019, 01:47:16 pm »
The dimensional change is very consistant, so you can print a test piece, measure it and then scale future prints accordingly in the slicer.

I never tried this myself, but I guess different filaments behave differently. Parts also tend to deform. Also changing printing orientation will need adjustments... I mean, it all sound quite a bit of trouble to me. I think I'll try other plastics before going this way...

Anyway, do you have experience with annealing?
 


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