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Old Oct 29, 2009, 10:19 PM
Southern Pride
everydayflyer's Avatar
Haralson County GA. USA
Joined Oct 2004
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I run my iCharger ,DUO and 720is on 24.7V 30 amps. supplied by two IBM 235 hot swapable power supplies connected in series.

That is a secret so please do not tell anyone as it will cause a big comotion here.

Unless you are really in a big hurry charging really big / high cell count LiPoloys the difference is not really that big of a deal. 5C chrges are only approx. 5min. faster than 3C charges.


Quote:
I have bougt a few that I could not get to come on no matter what.
Do you have a Radio Shack near by. They used to save if you have questions we have answers.

Charles
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Old Oct 29, 2009, 11:35 PM
Use the 4S Luke
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USA, TX, Euless
Joined Aug 2003
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Hmm never thought of Radio Shack. Or is that a joke?
I'm pretty sure they don't know much about server power supplies.
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Old Oct 30, 2009, 02:31 PM
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I need a favor, would someone who owns one of these HP p/ss please measure the dimensions of the case. Width, length and height.
Much grass!
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Old Oct 30, 2009, 03:44 PM
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Quote:
Originally Posted by everydayflyer View Post

Do you have a Radio Shack near by. They used to save if you have questions we have answers.

Charles
Radio Shack's policy still seems to be "If you have questions, we have answers", although I've never had them give me a CORRECT answer.

Dan
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Old Oct 30, 2009, 03:49 PM
Electric Helis is my game
MrMel's Avatar
Lidingo, Sweden
Joined Feb 2005
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Hmm, I tried a couple of ways to trick the HP PS with lower speed fans, single fan etc but no dice, it monitors each fan, if one fan has too low RPM, it shut down the PS.
Even tried to couple the tach from one fan to the other, thinking it would think both was running, but nope.

So Boeing 747 at takeoff in the background or no power.
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Old Oct 30, 2009, 09:44 PM
ancora imparo
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Melbourne, Australia
Joined Jul 2005
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MrMel, that's a bummer. I was hoping somebody might find a simple solution.

Here's a crazy idea - no clue if it will work.

How about removing the blades totally from the fans? Add an external fan.

Somebody who actually knows something about these supplies may know better, but I think the PS control circuit will get its fan speed feedback from the frequency of the fan supply or by voltage variation on the motor windings, not by measuring the actual rotation speed using a tacho. The fan motors should run at the set speed, and there is still the same free air passage area as before. Means no change to the structural support the fan housings provide as well.

Just a thought.

John
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Old Oct 30, 2009, 10:35 PM
Use the 4S Luke
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I missed it. What's wrong with leaving the fans alone?
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Old Oct 30, 2009, 10:41 PM
Southern Pride
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Haralson County GA. USA
Joined Oct 2004
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Quote:
So Boeing 747 at takeoff in the background or no power.
Some complain about the noise. I have two IBM 235s less than 2 ft. from me. Also have two CC-400 running same distance from me very often in addation to the fan of whichever charger(s) I may be using at the time.

As long as I can hear them I figure I have not gone deaf yet.

Charles
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Old Oct 30, 2009, 11:38 PM
Use the 4S Luke
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USA, TX, Euless
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What?
The 235's I've built and sold have been pretty quiet for the most part. Surprisingly some are noiser than others. The 42 only have one fan and it is quieter yet. I converted a 58A supply 2 wks ago and it has 2 small very noisy fans. At the field yo canot hear themover the helis, glow, and gab.
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Old Oct 31, 2009, 02:25 AM
Electric Helis is my game
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Lidingo, Sweden
Joined Feb 2005
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The HP supply blows papers away on my desk 4 meters away, thats how powerful the fans are..
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Old Oct 31, 2009, 03:14 AM
ancora imparo
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Melbourne, Australia
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Look on the bright side.
You get two free EDF's at the same time as the PS.
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Old Oct 31, 2009, 03:17 AM
Electric Helis is my game
MrMel's Avatar
Lidingo, Sweden
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Yep, and grab it in the fall, go outside and use it as a leafblower
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Old Oct 31, 2009, 03:40 AM
ancora imparo
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Melbourne, Australia
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MrMel, on a serious note I doubt if you can have a quiet and compact and powerful air cooled supply. It's a bit like the old printer's motto that used to hang on the wall of small print shops before digital publishing.

Good, Cheap, Quick - pick any two.

HP have obviously had to use two noisy high speed fans to get enough airflow to keep these things within spec for the worst case conditions - full load and high ambient temps. Given that they will be expected to work in a datacenter the ambient is from the surrounding gear and can be pretty high. It may be that they will cope with a lower airflow for most of what we use them for, but as you have found out the trick is in persuading the smarts in the PS to allow the fan to run slower. I bet you could do it if you actually had a circuit for one of these things but I read somewhere that info is "only available to a tier-one service facility" - sounds scary.

John
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Old Nov 08, 2009, 06:41 PM
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Great thread guys. I use the IBM 235's too. Excellent. Once in a while on power up they do trip the house circuit.
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Old Nov 08, 2009, 08:02 PM
Use the 4S Luke
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USA, TX, Euless
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Yikes

I got my 147A supply to power up this weekend. Now I need to find a bunch of chargers.
It's only 240V.
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