HP HSTNS-PL11 PSU OVP & Output voltage increase
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- Опубликовано: 8 сен 2024
- 1. To activate the PSU, add a 330 ohm resistor between Pin 33 and 36
2. In parallel with a 5K ohm resistor, the output voltage increases to 14.34V
3. Parallel a 7.68K ohm resistor to adjust the OVP voltage OR patch the firmware to disable OVP
BOM:
MFR-25FBF52-5K1
MFR-25FBF52-7K68
53CAD-D28-B15L
Technically speaking, I would recommend employing Nichrome 80 12 gauge AWG resistance wire for the construction of a dummy load, instead of relying on the 7.2 ohm cement resistor as demonstrated in the video
В данном видео автор показывает как переделать серверный блок питания 12 вольт в мощный блок питания с напряжением 14.34 вольта . Первым делом чтобы блок питания включался при включении его в сеть 230 вольт необходимо припаять резистор 330 Ом на контакты 33 и 36 . Далее необходимо поднять напряжение припаяв провода и 10К Ом (два по 5 К Ом в параллель) резистор к местам показанным в видео. Чтобы не срабатывала защита по повышенному напряжению OVP необходимо припаять резистор 7.68К Ом или резисторную сборку такого номинала в места показанные на видео на второй печатной плате . В видео достаточно подробно показано как опытным путем подобрать номиналы резисторов , а именно то что максимальное напряжение после которого сработает защита OVP под нагрузкой это 13.9 вольт в этот же момент на плате защиты напряжение 3.5 вольта при 3.6 вольтах срабатывает защита . Это значит номиналами резисторов на первой плате мы поднимаем напряжение а на второй понижаем . Второй способ как обойти защиту по перенапряжению OVP - это пере прошить контролер измененной прошивкой при помощи программатора и программного обеспечения показанного на видео . Подробнее о прошивке блока питания на ГитХабе автора видео github.com/darwinbeing/HPServerPSUHack
Братан, ты чуть запутался, для поднятия напряжения нужен резистор в 5кОм, это 2 резистора по 10кОм в параллель, при параллельном соединении сопротивление падает, а при последовательном увеличивается:)
You are misinformed in some of your u der standing of electricity and resistance. The resistance is reduced when combined in parallel. If you want tto gain resistance you need to add them in series. Just thought I'd make sure you understand so thing s make more sense to you in the future mate 😊
thankyou Tao , i did the modification soldering the 2 pairs of wires to the pcbs as you showed , then 5k and 7.68k resistors in between them and it worked for me , i have 14.18vdc output , fantastic .
a bit fiddly taking the psu away from the case due to sticky pads in places but it all worked for me using the values you said
thanks
ian .
⭐⭐⭐⭐⭐ Thank you , You are great ! Everything is very clear and accessible . If you don 't mind , I 'll leave a comment in Russian below to tell Russian - speaking people the details . 🙂
Thank you for your kind words! I'm glad that I could help you. You are more than welcome to leave a comment in Russian below to help other Russian-speaking people understand the details.
Very interesting. I think using the resistor method will be more practical as it is easier if you don't have the right sort of firmware programmer. The OVP circuit often triggers on the 54v PoE power supply that is used in the Aruba switches.
The HPE PSU is a powerful and versatile power supply unit that can be modified or hacked to suit a wide range of needs,With some basic electronics knowledge and proper safety precautions, it's possible to make this PSU even more useful and versatile for your specific applications.
Modified HPE PSUs are suitable for RC battery charging, radio power supply, and vehicle flashing/powering applications.
I have shared some of my experiences on GitHub and hope that they will be helpful to you.
github.com/darwinbeing/HPServerPSUHack
How to make current regulator to use constant current mode?
Hi, do you have any experience in reworking such a server unit hp 1300wt hstns-pa01 (astec) aa23530
Thank you for uploading the actual process of finding the OVP(Over Voltage Protection) trigger voltage. I was familiar with the common voltage divider mod for adjusting the output voltage and just lifting the OVP sense pin, but keeping the OVP active is obviously a safer mod method, and your meticulous process of checking between OVP triggering output voltage and the associated OVP sense voltage is very effective at demonstrating "cause and effect" (or 'effect and cause' in this case - output voltage vs OVP sense voltage comparison).
Just one question, is the dual 10k setup (for voltage output adjust) intended as a redundancy(in case one 10k resistor fails) or for watt capacity increase?
Neither actually. It's just that I don't have the right resistors on hand. Just using what's available.😅
Ah! You were intending a 5k value by using the dual 10k resistors (in the case of same value resistors, the resulting resistance being equal to the value of a resitor x 1/no.of resistors - in this case 10k x 1/2 = 5k). Pardon me for the brain fart! Cheers.@@taoli1239
Do these have over current protection?
I wanted to use two in parallel to charge a 7kwh lithium iron phosphate battery bank. I'm afraid the low internal resistance my battery might mean it will try to take more than the rated power of these PSUs.
Use resistor 5K ohm 2 pcs equal to 10K ohm OR 10K ohm 1pcs
Simply use a single resistor with a resistance of 10K ohms.
@@taoli1239 resistance of 10K ohms at 1/8w 1/4w 1/2w ? Resistance 7.68K at 1/8w 1/4w 1/2w?
hp model hstns-pl28, is there a way to fix this? Doesn't let the ovp system using resistance
How low can u go without triggering ovp? I want to make 2x hp powersupply serial 19.5v
Very nice video!
I have mostly used the 750W model for all my designs. I need to try one of these. Have ever tried the 750W model?
👍👍
The Innovati0n Lab
What is the problem if it keep turning off sometimes
I am having the worst time trying to solder a wire or anything to that jumper, do you guys know if the ones on the bottom of the board are the same?
Hi! Do you know how we can limit the maximum output current?
Очень интересный вопрос .
I haven't tried to limit the maximum current, but I think it's possible to achieve it by modifying the hardware or firmware. Pins 12/13/14 of the amplifier MC33274A are used to amplify the current, and pin 14 has a voltage divider circuit to limit the maximum current. you may try parallel connecting an 8.2k(labeled '8201') resistor with a potentiometer to see if it can limit the maximum current.
MC33274A(14)->8.2k(8201)->576R(74A)1k(01b)->2.05k(31B)->GND
@@taoli1239 @user-ye4pl3vx2x
Hello! Do you have any updates on this topic? thanks
Thankyou for this guide great work, i was able to mod my supply to 15.8v and also use the software to flash the chip
if i was to get another HSTNS-PL11 with a different REV version would the REV12 firmware mod work on say a REV07?
thanks
After iterating through so many versions, the firmware should be quite stable. However, to be on the safe side, I suggest backing up the firmware by reading it out before attempting any upgrades. It's recommended to compare the backed-up firmware with the current version to check for any modifications.
@@taoli1239 thanks ill have to try it on another revision
no need for resistor between the activation pins. Simply short them together
Why I mod 13.25v 😂😂?
modif to 30v or 36v...😅
must be rewinding transformer?
you may need to rewind the transformer, I don't have access to information about the turn ratio of the main transformer.
@@taoli1239😅 I failed because the tin on the legs of the transformers is very big.. I tried many ways to remove it but still failed
@@ourchannel8215 The three legs of the transformer dissipate heat quickly, and it's possible that a solder with a higher melting point is used. It's advisable to use a high-power temperature-controlled soldering iron to desolder it.
@@taoli1239 yes..maybe a soldering iron around 300 watts and above can solve it..
Hello!
I have PL11 rev 16 and I can't get an OVP of 14.5V.
In this revision there is a PIC called A4315-1
Photo as in the post of 21.04.2022
hp-hstns-pl11-over-voltage-protection-voltage-increase
Without load my power supply picks up the voltage to 14,4V , but as soon as I connect the load the voltage drops to 13,6V and changing the resistance has no effect on the voltage. With the load and at 13,6V my power supply makes a noise, but this noise comes from the board and not from the cooler.
ruclips.net/video/ZAV9bshD1rU/видео.html - problem in this video
Maybe you have a solution for my PL11 rev16 power supply?
Try resetting it to factory settings by disconnecting the two variable resistors you added. Observe if the output voltage meets the expected values with the same load.
From the video, it appears that the output voltage drops by approximately 0.9V when a load is connected, accompanied by noise. With the load of 4 turns, estimating a current of around 40A, theoretically, the voltage drop should be a maximum of 0.2V.
When the output voltage is too low, the system will try to increase the PWM frequency and duty cycle to boost the output voltage. The noise could be caused by a very high PWM frequency, noise generated by the main transformer.
There is a possibility that you may have damaged certain components during the mod process. For example, setting the OVP too high and setting the adjustable resistor controlling the output too low, close to zero. In such cases, powering on the system can result in an excessively high output voltage, damaging certain components(e.g. filtering capacitor), The Rev16 version has one less filter capacitor, which may be related to the issue.
Another possibility is that you may have purchased a fake power supply. Genuine power supplies typically have serial numbers starting from 1, whereas yours starts from 3.
The power supply is very similar to HP HSTNS-PL18, not PL11.
@@taoli1239 Thank you for your detailed response! I will take the time to do as you advise. I will be sure to let you know the result.