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Apr 27, 2021, 10:39 AM
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I just made this for about $100...

2400w, 24v... Ultra quiet and does not overheat outside during summer in Southern Spain...


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Apr 27, 2021, 12:06 PM
Retired Electronics Specialist
vollrathd's Avatar

Don't disconnect fans!


Quote:
Originally Posted by mt_100
The PSU is designed with the proper fan speed by the manufacturer to facilitate adequate cooling to the unit. As more power is consumed from it the fan will run faster to keep it from overheating. Changing the fan speed will result in a very increased risk premature failure.
Some 10 years ago, the company I worked at had a 48 Volt 50 Amp power supply in one of our 38,000 volt circuit breakers.

The breaker was designed for out door use. The power supply fan pulled air through it. On humid days, we had PS failures.

So, one of our brilliant engineers decided that since there was no load on that power supply for 99.999% of the time, just disconnect the fan.

Yup, we had power supply failures with the fan disconnected. About 20% of them failed. We had to replace hundreds of them with a P.S. design with no fan. The replacement PS ran about $1200 each.

These PS units are installed in HV breakers, typically located 30 feet in the air. Repair required a boom bucket truck. That factory recall cost many $100K's.

I checked the temperature rise of an internal transformer in that PS. It hit 350 F after two days.
Last edited by vollrathd; Apr 27, 2021 at 12:15 PM.
May 06, 2021, 02:50 AM
Registered User

Delta/IBM DPS-120BB


Hello,

I hope to be in the right place...

I have just got a DPS-1200BB PSU which I would like to output 14+ V and I thought I had instructions on that, but I just can't find them anymore.
After searching, I have found information on DPS-2500BB, -2000BB and -1600BB and the question is: it is applicable to my model?

For instance:
- https://www.rcgroups.com/forums/show...1#post18117345

Thanks in advance!
Today, 08:18 AM
Registered User
has anyone found out how to disable OVP on DPS-800GB-1A , it different from regular DPS-800GB A, same goes for 800GB-3A. I can max 13.2V, but want at east 13.6V
Today, 11:24 AM
Registered User
I have a few A870P power supplies, thanks to this forum I have been able to make them work to give me 12 and 24(series setup)volts.
I have 2 questions on these please

#1 is there a way to force the fan to high speed (just to make sure they will run faster? Currently they run slow, I haven't yet been able to get them to run faster.

#2 is there a way to adjust the 12v to a higher voltage on these? I am not sure how to get this done (or of it's even possible)..

Thank you in advance for any assistance ��
Today, 07:55 PM
Registered User
Hello! Please help to turn on Delta DPST-2530AB A 12.5V 12V 200A

I try to connect yellow pins to GND with 500 Ohm resistor, but no effect


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