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Old Sep 20, 2011, 09:57 PM
Unshaven yokel
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Portland, Oregon
Joined Oct 2007
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The loadtester is the load.. Carbon pile.. They have em at harbor freight on sale for $50. They can test up to 500 amps for 15 seconds..

Sadly, I don't think even 225 amps is enough to turn over a starter without tripping overcurrent protection.

I wish I had something that needed 225 amps..
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Old Sep 21, 2011, 04:22 PM
Use the 4S Luke
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USA, TX, Euless
Joined Aug 2003
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225A X 12V = 3.7HP Surely enough to start a Honda.
I need a pile for load testing my power supplies before selling them. Right now I use a car heater. About 10A.
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Old Sep 21, 2011, 05:54 PM
Unshaven yokel
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Portland, Oregon
Joined Oct 2007
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$50 is for the loadtester, which is the carbon pile, a variable load knob and amp and voltage meter. Can probably test a supply at 100% duty cycle if you put a fan on the pile ( or make diamonds ).

Im going to be making the 20th supply this week from those 580 supplies. If theres interest, i can post build pictures. 4x 16 or 18 gauge wire in 4" pieces soldered to a ring terminal. These get bolted onto the bottom of the binding post and soldered in place. The ring terminal insulation around the crimped part goes through the vent holes and prevents rotation. A little CA around the post just to make sure it doesnt wiggle (the soldering loosens up the binding post, but it still cant rotate.
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Old Sep 22, 2011, 04:11 PM
Steven
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United States, CT, East Hartford
Joined May 2010
504 Posts
Poweredge 6800 JD200 PSU OVP Disable and super slow fan mod

I've managed to crack the OVP of the JD200 version of the Poweredge 6800 PSU. It's now adjustable to around 16v.
Also managed a super slow fan speed mod for the JD200.
Only a 47K and 100k resistor are needed for these mods.

I will post pictures and solder points in next post.
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Old Sep 22, 2011, 04:20 PM
Unshaven yokel
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Portland, Oregon
Joined Oct 2007
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Sweet! Thats some good stuff.

On the jd200, i did the pin mod to ground and then added 20 ohms inline to each fan to have it silent.

The jd200 produces ALOT of RFI every 200khz or so from the fans. The kd175 doesnt, however the kd175 appears to be more difficult to tap into the power. The jd200 has large copper bars for + and - , the kd175 does not.

Excited to do these additional mods on my jd200s. Despite the rfi, its an awesome setup.
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Old Sep 22, 2011, 04:49 PM
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Joined Sep 2011
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Can anyone help me finding out the pin configuration of an ASTEC AA23260 psu? I have tried the method mentioned earlier in this thread, but I could'nt get it to work... These are psu's for ibm x346 servers. I have searched everywhere, with no luck!
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Old Sep 23, 2011, 01:09 AM
Unshaven yokel
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Portland, Oregon
Joined Oct 2007
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C19 plug. They're about 20$ online for a cable, they're pretty standard in the server industry. You can also get away with widening the crimp on connector style slip on connectors that you find for cheap at auto parts stores...

I get my cables from surplus stores locally for $5, otherwise I'd do the crimp connectors. Most of them were 220v connectors, so I had to replace the ends on all of them...
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Old Sep 23, 2011, 08:33 AM
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Quote:
Originally Posted by sparkysko View Post
$50 is for the loadtester, which is the carbon pile, a variable load knob and amp and voltage meter. Can probably test a supply at 100% duty cycle if you put a fan on the pile ( or make diamonds ).

Im going to be making the 20th supply this week from those 580 supplies. If theres interest, i can post build pictures. 4x 16 or 18 gauge wire in 4" pieces soldered to a ring terminal. These get bolted onto the bottom of the binding post and soldered in place. The ring terminal insulation around the crimped part goes through the vent holes and prevents rotation. A little CA around the post just to make sure it doesnt wiggle (the soldering loosens up the binding post, but it still cant rotate.
Hey bud, would love to see some pics of your work, if not a complete thread.. I bet many people here would love that too..
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Old Sep 24, 2011, 03:49 PM
Steven
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United States, CT, East Hartford
Joined May 2010
504 Posts
Poweredge 6800 JD200 PS OVP Disable modification.

These are the points to set the Over Voltage Protection (OVP)

on the JD200 version of the Poweredge 6800 PSU.

Just solder a 100k resistor across this component.

It resides on the daughterboard that sits to the left of the power supply from the back.

The Over Current Protection (OCP) circuit still works with this mod.

Voltage is now adjustable up to 15.2v with pot from +12v Rtn Sense to +3.3v (pins D3 and D4)

or 15.3v with pot from +12v Sense to ground (pins D2 to C3) where OVP will kick in.

OVP is set at 15.3v with the 100k resistor.

Any less than 100k will increase the OVP to above 15.3v,

but will also increase the UVP to above 12v.

I suggest staying below 15.1v to keep everything within spec.

Tested at 110A and 15v.

Do this modification at your own risk !!

This is just one method to change the OVP. I opted not to remove any components.
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Last edited by xandrios; Feb 18, 2012 at 02:20 AM.
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Old Sep 24, 2011, 04:53 PM
Steven
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United States, CT, East Hartford
Joined May 2010
504 Posts
Poweredge 6800 PSU JD200 Fan Speed Control mod.

This internal mod allows for variable fan speed control on the JD200 PSU from 24.5 Hz to 56 HZ. (Super slow speed)

A fan will typically output two pulses per revolution so the tach output will read from 49 Hz to 112 Hz.

RFI from the fans should also be completely eliminated.

Solder a 39k ohm resistor ( Orange White Orange ) between the points highlighted in the pics.

Any value potentiometer from 1k to 100k will work for the external speed adjustment.

Connect one side terminal of the pot to pin C1(Ground).

Connect the center/wiper to pin C2(Fan speed control).

And connect the other side terminal to pin C4(+3v stby).

A simple variable resistor between pins C1 and C2 will not work.

Start with the potentiometer set to halfway, then adjust from there.

The fans will cold start with a tach setting between 59 Hz and 112 Hz.

After an initial fan spin up, they can be adjusted downward to 49 Hz if needed.

If you want the fans to speed up automatically in proportion to the output

current/power then just replace pin C4 with pin A2(Current share pin).

Then adjust accordingly with the pot.

Just a reminder: You can control the fans with the external pot even if you don't do the internal mod but the fans will run much faster.

Do this mod at your own risk !!

Tested at 110A and 15v with pot set to the lowest fan speed setting. This PSU runs cool even at this setting.
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Last edited by xandrios; Nov 30, 2012 at 02:45 PM.
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Old Sep 25, 2011, 01:22 AM
ancora imparo
jj604's Avatar
Melbourne, Australia
Joined Jul 2005
6,381 Posts
Xandrios, don't forget to put a link in the sticky thread when you are happy with this set of mods.

John
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Old Sep 25, 2011, 05:04 AM
Steven
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United States, CT, East Hartford
Joined May 2010
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OK. Added them to the sticky. Thanks.
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Old Sep 25, 2011, 11:01 PM
Unshaven yokel
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Portland, Oregon
Joined Oct 2007
1,483 Posts
With regulation mod ('close enough' resistance values) and the + sense wire hooked up at the load, I'd get a 0.05% rise (0.01v)

Without using the sense wire, and using dual 10 turn pots, I can dial in the voltage to 0% change with load.*

*The current share doesn't really 'kick in' until after 20 amps (the 2v at the current share wire), so the 0-20 amp voltage will be slightly higher than it should be, and from 20 amps on up to 75 amps it will remain the same.. I set the voltage to 13.2 at 20 amp load, and then go to 70 amps and set the current share 10 turn pot until it reads 13.2, end result is 13.2 all around. Bumps up to about 13.25 between 0-20 amps...
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Old Sep 25, 2011, 11:18 PM
Unshaven yokel
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Portland, Oregon
Joined Oct 2007
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One more, to be gratuitous. I think we can start a truck now. 1-2 minute charge a winch battery?
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