PMP-400 burned twice

Complete water cooling systems (for example: Exos-2.5, PC5-1336, etc.)...
masha
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PMP-400 burned twice

Postby masha » Sun Aug 28, 2011 6:30 pm

hi. I got
Exos v2.5 -> CPU360 block -> rampage 3 block -> 120mm Aluminum RAD -> 120mm Aluminum RAD -> gtx 480 block -> Koolance 1000W -> back to Exos 2.5

Everything is cooled to my satisfaction. One problem, Exos v2.5 pump burns after about 3 month, once replaced, pump burns again after 4 month.

1. my computer is on 24/7
2. P set to 10 (koolance default)

Why does PMP-400 burns (I know it burned, I can smell it, I know the difference between burned pump/water bubble/controller fail)

If I need to add pump, where? and how can I control it, can it be added on as second pump on a koolance controller?

Thank you.

ENTROPY
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Re: PMP-400 burned twice

Postby ENTROPY » Mon Sep 12, 2011 11:07 pm

People can only speculate given there is little of substance to go on. My best guess is that you have a lot of air in your system, you aren't supplying minimum net positive suction head to the pump, and may be operating at shut off head. All of these would mean that the pump is working really hard to supply a minimal flow and is burning itself up. Can you feel the motor while operating--is it hot? (okay for when you have one that works).

If you need more flow--you'd add a pump in parallel but should have check valves on the pump discharges. If you need more head, you'd install in series. It would be better to opt for a pump of larger capacity and greater head (or you can do as the fad is for so-so systems and split the system into two loops.

Ace0751
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Re: PMP-400 burned twice

Postby Ace0751 » Wed Sep 14, 2011 8:45 am

I've had my exos 2.5 for 3 years now and have yet to have it burn out. The problem is leaving your pc on the whole time and also having set to the max which is 10. You don't need to have the pc on the whole time cause it means more work for the pump, in other words have a shorter life span. It seems you have it in a series and its losing a lot of flow when it gets to the video card. Are those rads 1 fan, 2 fan, or 3 fan? if its a 2 or 3 fan then you really need to add another pump after the second rad so it will have enough flow to get back to the exos.

So replace the pump in the exos again and another pump would be your best bet. If you do that you can then lower the pump setting so it would go something like this:
exos > CPU360 > NB > 120 rad > 120 rad > pump > gtx480 > exos or:
exos > CPU360 > NB > 120 rad > Pump > 120 rad > gtx480 > exos

Lastly you don't need to leave it on all the time cause like I said it will shorten your pumps life.
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bambihunter
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Re: PMP-400 burned twice

Postby bambihunter » Tue Sep 20, 2011 11:26 pm

I have had my system for several years now and it runs 24/7 folding. I have found that if I run my pmp-400's at 10 they cavitate and suck air. I have also found that they need nowhere NEAR the max flow to keep my system cool. I actually now run 2 of my pumps on 1 and another on 3 (only because it would cycle off then back on every few seconds if I go below 3). These are on 3 different loops. Extra flow really gains you nothing as long as you're over the minimum. Think of it this way, sure, the water is above the block for less amount of time, thus getting less heat. It is also however in the radiator less time too so in the end it gains nothing.
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Ace0751
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Re: PMP-400 burned twice

Postby Ace0751 » Wed Sep 21, 2011 9:22 am

Exactly, I have a two loop setup and my video card which is on the exos loop runs at setting 5 and temps never exceed 46c and that's on a hot day. So having it at 10 won't do much good you will just burn it more quickly.
GIGABYTE X58-UD7 Mobo Rev. 2
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DDuckMan
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Re: PMP-400 burned twice

Postby DDuckMan » Fri Nov 04, 2011 11:10 am

I usually just run the pump the slowest it will run without stalling, usually P5 or P6. My new pump seems to run find at P5 but is quietest at P8. Any problem letting it run at that setting? The PC is on 2-6 hours/day.

Ace0751
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Re: PMP-400 burned twice

Postby Ace0751 » Fri Nov 04, 2011 11:35 am

If you don't keep it on all day you should not have a problem.
GIGABYTE X58-UD7 Mobo Rev. 2
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