Tutorial How to mod a 12V 90A PSU

Hi!

With @Pit 's method to multiple HBridges, we have to find more POWER!!
http://www.xsimulator.net/community...alf-bridge-60a-continuous-and-120a-peak.6537/

Here is the way to use this powerful PSU AWF-11DC-1400
1400W total

Here is the method from RCGroups.com
http://www.rcgroups.com/forums/showpost.php?p=11640787&postcount=7

how to solve an unknown supply

Bringing that up, this is the method I used to find the correct pins to power up this supply. It also works for a majority of PS units out there.

With power off and testing each pin to ground.

1. Exclude any pins that are common to each other(including ground pins). Usually these are the 3v and 5v rail pins. They also show the same resistance.

2. Exclude any open pins(pins with no resistance that don't connect to anything).

3. Exclude any pins with a value below 1k ohms and above 10k ohms. From my experience, I've found that the pson and pskill resistance usually falls between a 1k and 10k range.

With power on.

4. Exclude any pins that show no voltage.(pson and pskill are held partially TTL high or just not grounded. So they show some voltage on them).

This will usually leave between 4-6 pins.

Use a .5k ohm resistor on each of the individual remaining pins and connect each to ground. The power supply will usually power up at this point.

Disconnect one resistor at a time from ground.

If the PS remains on after a you disconnect a resistor from ground, then the remaining pins contain the pson and pskill. So keep it disconnected from ground.

If the power supply turns off, then the disconnected pin is either the pson or pskill. So reconnect it to ground.

Repeat this process until you find the pson and pskill pins.

In some cases the PS will turn on with a fault.

If this happens then disconnect one resistor(pin) at a time from ground to find the one that is causing the fault. Then continue with the process above to find the pskill and pson pins.​

Let's try to find out what pins are required to start the PSU

Here is the result!

58 pins
... and only one is needed to turn ON and OFF the PSU

@RacingMat thank you so much for that in deed my server psu - 69A is completely stressed. From time to time they stop working. Always I was looking for stronger PSUs so your thread is very welcome.

@RacingMat , I've just received this PSU to replace the 12V battery I'm using on my rig. Works fine...2minutes, then it turns off (while driving...hard), I believe to protect itself even though it's not warm at all.

I was wondering if you have connected the +12V on one connector or both connectors available on the PSU output? See picture below, I have only connected the ground on the blue pin and +12V on the red pin,I'm wondering if I should also connect the +12V on the yellow pin, just in case those are two separated circuits.


Thanks for your help

Well, I can confirm that it's not overheating at all since I can simply unplug and plug the power supply again and it starts immediately. I really hopped this PSU would do it for my 2 23A rated motors Maybe adding a large capacitor could help?

Your issue is caused by a high peak protection. IMO you can avoid the shut down by using one PSU for each motor.

yes, that's a good idea: you should use the 3 pins to see if it's better

23A x 2 = 46A that should be okay
but depending on your motors, peaks can be very high... Can you share some pics of your motors?

Do you have a currentmeter with peak memory?

Hallo RacingMat, do you think that 2 of these psu shuold be ok for 2 sabertooth 2x32 and 4 dc motors 12v
270 w 23A and 40A peak?

Yes it helped a lot .
https://www.xsimulator.net/communit...r-supply-dps-2000bb-a.6709/page-4#post-128774

Hi Speedy thanks for your reply
Sorry I 'm not understand if for my 2 sabertooth 2x32 and my motors 200w 23A 40A peak is ok this psu http://www.electronicsurplus.it/en/product/3060/Power-supply-IBM-AWF-11DC-1400W-12V-90A.html (one for each card and 2 motors) or if you suggest this other psu "dps-200bb"

Pit suggest to use 1 psu PSU AWF-11DC-14001400W for each motor? what does he mean? the motors receive the power from card and not directly from psu. So if I use sabertooth 2x32 in wich I connect 2 motors how can I use 2 psu for each motor??

With such a PSU (12V 90A) you can satisfy to what is demanded by your Sabertooth to drive the motors.

If motors make the system halt, it would be that sabertooth is overwhelmed.

I have some to sell (where do you live?)

I'm from Vicenza North Italy

Yes ... this 90A PSU is absolutely perfect .

Thanks speedy I'll buy 2 of them

Hallo, I've just received 2 of these psu
I apologize if I put the question, but having no competence in this matter would not do damage. In addition the use of google translator does not allow me to fully understand what to do.
Let's see if I understand it:
- I have to pick up the + 12v from all three available pin connecting them
- I have to pick up the -12V from the only available pin (pin 0)
- I have to connect a switch between Pin 11 and Pin 12 Gnd start to create a switch on / off power supply.
All correct?

yes! only one 12V pin should be enough but you can link them as @Vef445 did

and pin 0 is 0V (not -12V)

Thanks RacingMat
The fans of these psu are very noisy, maybe because they are a bit old too. The manufacturer declares 54 db. They have an air flow of 130 m³ / h. I find them available as spare but they are very expensive (about 50 Euros each), and there is still noise problem.
In these power supplies there are two equal fans mounted on opposite sides. One aspirates while the other expels
Their size is 92x92 mm.
According to you, can it be enough to replace them with more economical fans that have an air port of about 50/60 m³ / h and are much quieter?
For example:
Http://www.drako.it/drako_catalog/product_info.php?products_id=7845 - 46 m³ / h and only 13 db
Http://www.drako.it/drako_catalog/product_info.php?products_id=14536 - 64 m³ / h and only 17 db

Hallo,
Please see my post here https://www.xsimulator.net/communit...nd-windows-utilities.4957/page-69#post-136565
I also tried what Vef445 suggest and the situation is a little better but at 110PWMMax I have the same problem.
Probably it's apsu problem. Any idea to solve it?
thanks
gigi