Power Supply failure  

Re: Power Supply failure

The part number could be of help if we can tie several events to a particular number. I'm wondering if there are different suppliers of the same part, but each has their own part number.
Maybe a visual comparison to failed or noisy parts?

Re: Power Supply failure

See below... Most info is on here..

Re: Power Supply failure

He's looking for the component level part number for the physical thermistor that failed on the board. It looks like that's the part number for the entire PSU.

Edit: it was provided in the second post; NTC 5D-11

Re: Power Supply failure

Ah yeah... Ok.. I put that in the beginning...

Re: Power Supply failure

Hm, that doesn't seem to be a proper CE mark. And if the supplier of the PSU follows all requirements to be able to sell in the EU I would think that they would put in the extra effort of having a proper CE symbol on the product. But I guess Prusa (the company) have checked all this before putting it in the printer.

Anyway this is how a proper CE mark should look:

Re: Power Supply failure

Hm, that doesn't seem to be a proper CE mark. And if the supplier of the PSU follows all requirements to be able to sell in the EU I would think that they would put in the extra effort of having a proper CE symbol on the product. But I guess Prusa (the company) have checked all this before putting it in the printer.

Anyway this is how a proper CE mark should look:

China Export ?

Re: Power Supply failure

While I don't disagree with you, you didn't mirror the C properly. What you did looks like this if done to the logo diagram.

The C stretches over the mirror line, so you need to adjust for that when mirroring.

Re: Power Supply failure

Sorry Zaz, but I think nuno.m2 interpretation is right.
The CE mark on this PSU is not an approved symbol. It is very carefully specified how the symbol is to be performed.
It would really bad if this PSU comes from a manufacturer who has not made a proper EU declaration of conformity for his product.

https://ec.europa.eu/growth/single-market/ce-marking_en

Re: Power Supply failure

He didn't disagree with my assumption, only with my poor photoshop skills... 😳

BTW, the CE mark on the printer (MK2S) label is OK.

Re: Power Supply failure

Looks like a fairly standard single 24v output 10Amps. Should be able to find a substitute or replacement. A physical size match could be a problem though. Don't know if the PSU hold-up time is good enough for the MK3 power recovery. The printed plastic lower cover would possibly need to be redesigned.

Digikey:
https://www.digikey.com/product-detail/en/mean-well-usa-inc/SP-240-24/1866-4738-ND/7706908

Datasheet:
http://www.meanwell.com/Upload/PDF/SP-240/SP-240-SPEC.PDF

Delta Electronics: 24v/240w
https://www.digikey.com/product-detail/en/delta-electronics/PMF-24V240WCGB/1145-1101-ND/4833510
http://www.deltapsu.com/products/download/Datasheet/PMF-24V240WCGB

Re: Power Supply failure

the C and E are indeed to close together for the european CE mark

Re: Power Supply failure

Could this be a reason why the orders are a bit behind.
I believe that its mandatory for electronics being sold on the European maket to have a PROPER CE mark.
Maybe prusa has been fooled by the chinese manufacturer ( i hope they didnt know) and that they need another PSU supplier. (they might need a recall on it , otherwise they could be sued iam afraid)
This PSU failure does scare me of and iam happy to wait a bit longer (estimated shipping was from 18dec ) to get a printer with a proven safe PSU .

Some info from them would be nice, before people gonna complain on social media.

Re: Power Supply failure

Could this be a reason why the orders are a bit behind.
I believe that its mandatory for electronics being sold on the European maket to have a PROPER CE mark.
Maybe prusa has been fooled by the chinese manufacturer ( i hope they didnt know) and that they need another PSU supplier. (they might need a recall on it , otherwise they could be sued iam afraid)
This PSU failure does scare me of and iam happy to wait a bit longer (estimated shipping was from 18dec ) to get a printer with a proven safe PSU .

Some info from them would be nice, before people gonna complain on social media.

Too late for that.. Social media has the ball.. It's been 4 days and no response to my ticket.

Re: Power Supply failure

For another data point, my supply failed last weekend after two weeks of operation. The printer appeared dead, so I turned the supply off and back on and the LCD flashes briefly, then nothing. I measured with a multimeter and the supply was at zero volts. Figuring a short somewhere, I started troubleshooting. With an oscilloscope, I can see the supply turn on, but it doesn't regulate at 24V, instead going up to almost 32V before (I'm guessing) the over voltage protection kicks in and turns the supply off.

Isolating the issue, I completely removed the supply from the printer and put a small dummy load resistor in case there is a minimum load requirement. I used a small 1/2 Watt 50 Ohm load. The oscilloscope showed the exact same behavior. I sent the oscilloscope capture to support and we are going back and forth.

So not the same problem as the OP, but another supply failure after just a couple weeks.

Jim

Re: Power Supply failure

Since this thread is getting a little off topic about the actual part I'll get it back on topic. From the help of Corey who gave me a link to the NTC Thermistor used in the PSU located here :

https://www.ebay.com/itm/332198259642?ul_noapp=true

I was able to find a suitable replacement on Mouser from a known manufacturer

https://www.mouser.com/productdetail/?qs=wgO0AD0o1vufDSqbSZQugw%3D%3D

This should hopefully outlast the Chinese part but hard to compare the actual specs without the datasheet of the original installed in the PSU.

Re: Power Supply failure

I got on chat today with a CSR. THey are shipping me out a new PSU. They want this one so they can do an autopsy to see what happened. The CSR made it sound like there is a bigger investigation under way. I hope they sub out a different PSU for the flakey ones.

Honestly I don't think I would replace the thermistor. You just don't know what else was affected when it blew.

Re: Power Supply failure

This thread does have me concerned, hope someone at Prusa can at least assure people that the clicking sound is normal.

BTW, I don't think PRPZ-24-240 is the model number, sounds more like a label for Prusa. If you look through the top back of the PSU with a flash light you can see the manufacture on the board. My unit says T-LED with a model number and what appears to be a version TLPZ-24-240 v2. Would be interesting to see if people have different versions, especially those who have clicking sound vs those who don't.

I could be wrong I believe this is the link to the company/power supply, makes sense as they are in CZ, the T-Led logo matches as does the yellow inspected sticker 🙂

https://www.t-led.cz/p/led-zdroj-24v-240w-vnitrni-5525

Re: Power Supply failure

This thread does have me concerned, hope someone at Prusa can at least assure people that the clicking sound is normal.

BTW, I don't think PRPZ-24-240 is the model number, sounds more like a label for Prusa. If you look through the top back of the PSU with a flash light you can see the manufacture on the board. My unit says T-LED with a model number and what appears to be a version TLPZ-24-240 v2. Would be interesting to see if people have different versions, especially those who have clicking sound vs those who don't.

I could be wrong I believe this is the link to the company/power supply, makes sense as they are in CZ, the T-Led logo matches as does the yellow inspected sticker 🙂

https://www.t-led.cz/p/led-zdroj-24v-240w-vnitrni-5525

That would be strange as the PSU supposed to be something like 90-264V and not being switched between 90-132V and 180-264V by hand, like the MK2/s PSUs are.

Re: Power Supply failure

It seems like the CE mark on the stepper motors also are wrong. However the CE mark on the printer itself is correct.

The purple is the official CE mark pasted over the image to line up with the C.

Re: Power Supply failure

Can we stop focusing on the CE mark, It's already been established that that CE mark matches China Export....check Page 6 of the handbook for product details.