I think the best I can do is point you to this forum thread: www.medwrench.com/thread/235288/error-10391 where fuses blown on board SNS12A are mentioned.

Compared to first generation units, this is cheaply built. It is no surprise to the price, it has to be cheaply built.

I am glad that it helped you, what stupid thing did you do? ;)

Not quite :) In my youth I was very fond of a Norwegian band called Kaizers Orchestra. The idea of the band members and their fans taking Kaizer as a lastname was a cult thing.

Not on these discarded units, that have been thrown around in the junk yard.

You are correct that the bottom negative one can be left unmodified. But only that one.

@@KaizerPowerElectronicsDk Exactly what I was thinking. I just received 4x DPS 800GB A and 2x DPS-1200SB A I was thinking to make one supply with the 4x 800GB that could do either 1x ~50V or 1x ~14V but for the price of switches cables and / or relays I might as well build 2 dedicated supplies. Anyway they are here now. I changed the voltage on the 1200GB's to 14.8V. Very nice!

While random, still very affected by the frequency of the electromagnetic field.

Try the method I show in my videos, and you can easily find out, without risk of damaging the PSU.

Its normal with a high impedance measurement, try to add a little load like a resistor and it should be loaded down to nothing.

@KaizerPowerElectronicsDk thanks for the quick reply. With some load it drops to zero. While going over it I've noticed one of the diodes om the controle board marked AE (there's a bunch of them near the AC side) is blown but everything works so I'm gonna push my luck and see how it holds up with a full load lol. I'm guessing it's a Transient Suppression diode that's not too essential

@@RubenRC94 yeah well.. you already bypassed a safety feature when removing the ground, which ruins the PELV class of the power supply :)

Since I'm pushing around 60A to charge large 12S lipo cells that's the least of my concern ;). I've found out the dioide is only linked to the fan controle so one of the 2 psu's skips over one of the intermediate fan speeds wich for me is no problem at all. Even after 5 years still a great video!

Almost good enough to sell it as New-In-Bow ;)

I have a lot of delta IC 650 battery chargers that are broken because of power supply voltage overload error

What middle part? You mean what looks like two coils? The sensor?

@@KaizerPowerElectronicsDk the middle part of the coil on the larger pads, its like they were trying to save money by not adding part of the coil

@@lamb998 Its a "two" power level zone pad. A lower current is induced, if its just a smaller pan on the pad. Thus efficiency is better. Energy is mostly only transferred when there is very close proximity of pan to coil.

Generally yes, as efficiency goes down fast with distance between load an coil.

Glad you enjoyed it

Gate resistors is mandatory. You want to switch your current as fast as slowly possible. Meaning that going too fast just gives you overshoot and ringning, too slow gives you higher losses from linear region and getting it just right with a small bump... perfect. Diodes and possible a lower value resistor can be used for faster turn-off.

Galvanic isolation between driving circuit and power electronics. What you are talking about is a HSD or High Side Driver. Here the isolation is at the logic level and a isolated power supply and driving circuit is floated at the IGBT voltage level instead. I listed Pros and Cons in the article on my website: kaizerpowerelectronics.dk/teslacoils/igbt-gate-drive-transformer-gdt-design-construction-and-test/

It's sometimes useful to galvanically isolate the driver from the high voltage rails, bootstrap and optoisolators are alright, but GDTs are great. Transformers are typically more expensive than solid state alternative, which as far as I'm aware is the main reason they're less common recently. They do also have issues with things like DC switching, as cores saturate with lower frequencies, though in turn saturation can act as a safety mechanism when driving purely inductive loads.

​@@UniCrafter Ultimately a GDT pretty much sets in stone how you have to run the IGBT. It's very application specific and doesn't allow for on-the-fly modifications. Whereas, with the same toroid, you could make a really basic SMPS circuit with 4 secondaries, and use simple opto-isolated gate drivers. Allows you full control of the IGBT without having to play around with a transformer every time you want to switch differently or use a different IGBT with different gate charges. Pretty much all EV/hybrid car inverters do it that way, just have a couple SMPS's that take 12v and make their +- 15v or whatever they want to use, and opto-isolate everything. Maybe its just cost but from an engineering perspective, it's possible that they would change the switching frequency on the fly for some reason, IE in sharp acceleration where one may not care about motor noise vs slow acceleration where a 10khz whine would get annoying really quick.

That is from my "Getting started with the UD3" video series. I did 2 parts so far, last part will be making actual lightning :) Part 2 with a MIDI playing on a static load in the last part: kzbin.info/www/bejne/hWiUamekhbOHns0

Interesting topic really! I just quickly googled half turn effect power transformers and apparently that is a bigger issue with high losses than I imagined. This further brings up a ring core as recommended GDT core, compared to E cores. E cores require some different compensating windings to negate half turn influence, if you exit the winding windows on opposite sides.

Thank you :) I put this topic in my video-to-do-list back in 2018, only took 6 years to finish!

I am happy that you find it useful :)

Good catch! It is as you say :)

Thermistor control from the adjusted tripping curves. The wires looks like they go the tripping/release actuator? It's been a while since I did this video, so memory is not 100% :)

@@KaizerPowerElectronicsDk Oh I see, so this wire is the trip output to the opening coil? This is not a thermistor input that would monitor the Masterpact temperature? As I understand the Masterpact, there is no actual "thermal trip" based on some bimetallic strip, they just call "thermal" the current threshold based on an time inverse curve to protect from overload.

@@RippleMks yeah I agree with you, its based on measurements and time, where the tripping curve actually is defined. So a thermistor would make no sense. I should not have said thermistor, but current evaluation module output to tripping coil.

I do not have any wiring diagrams. Contact EATON.

I would guess that these are not optimized for idling. There is no scenario where a server power supply is not loaded, when in use. Might not be fully loaded, as they are properly running in a N+1 configuration, but not idling.

Thank you for leaving a thank you. Interaction is a huge motivator for making more videos :)

It is all recycled properly as electronics and iron scraps :)

@@KaizerPowerElectronicsDk well okay I thought you might still have the scrap because I really need it...

If its not available on google, I can not locate it either.

All links are in the description, about in the middle is 4 github links.

My son had a party, it's really 4 years ago...

Did you find any solution to get more than 50W from this PSU ? Is the voltage drop still there ?

You must be listening on a phone or cheap computer speakers then ;)

Exactly😂​@@KaizerPowerElectronicsDk

Schematic in description shows it. 33R 17W, with 10 turns on 1.5mm^2 wire around them.

Thanks, how do you calculate the level shifting capacitor? I am building a dual 811a Tesla coil. It has 1500 volt plate transformer but only produces 2” sparks. I will post some video on my channel.

Thank you for joining. Worth picking up these machines.

See comment from @lewisse5

@lewisse5 1 year ago @KaizerPowerElectronicsDk Based on your numbering, it would be pin 5. If I remember correctly, I used a 5K pot between this pin and GND. I wanted to make it fully variable and tried reverse engineering the feedback-loop but the little daughter board is more than 4 layers and probing was difficult so I ultimatly gave up.

Thank you for sharing your repair experiences with everyone else!

There is plenty made! Just google for "server psu breakout board"

That is a pretty long hold up time for such a large load, to 6 cells.