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XSPC Dual Bay Res/Pump - low voltage?

post #1 of 21
Thread Starter 
So i was wondering if it spossible to run the XSPC Dual Bay Reservoir Pump at a lower voltage by changing round the molex pins similar to when you make a DIY 7v fan cable?

Just been going through my mind as to if it would work or not ?
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post #2 of 21
I see no reason why it wouldn't work, unless the pump requires more than 7v to start which I doubt.
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post #3 of 21
Thread Starter 
Quote:
Originally Posted by superericla View Post

I see no reason why it wouldn't work, unless the pump requires more than 7v to start which I doubt.

Martins liquid lab review says he started it at 5v so im pretty sure its gona start at 7v but im just concerned that using 7v mod of PSU may cause sort of issue with the PSU after a while as theres no actual 7v on the rail, it comes from 12 and 5 v together.

So i just wonder if its safe to do 24/7 ?

Hmmm
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post #4 of 21
Quote:
Originally Posted by superj1977 View Post

Martins liquid lab review says he started it at 5v so im pretty sure its gona start at 7v but im just concerned that using 7v mod of PSU may cause sort of issue with the PSU after a while as theres no actual 7v on the rail, it comes from 12 and 5 v together.
So i just wonder if its safe to do 24/7 ?
Hmmm
24/7 use should be fine. Even though there isn't an actual 7v rail, the +12v and -5v (or -12v and +5v) rails should be more than strong enough to support a single low-power pump.
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post #5 of 21
Thread Starter 
Tried it but my PSU wont allow the pump to run of 7v like this, maybe some sort of protection built in to PSU.

My other PSU which iused for WC flusing and leak test will let it work and it makes the pump run at 7v and its what i want but....damn HX1000 not let it run frown.gif
However my fans run on 7v off PSU, must be like i say built in protection from PSU.

Wonder if i can buy like some kind of variable resistor suitable for dropping voltage from 12V? hmmmm
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post #6 of 21
Why even use the PSU? I got my DDC pump running off of a wall-plug 7.5VDC@950mA.

NOTICE: when running a pump below 12VDC, be sure to check on the loop operation. Sometimes restiction build up over time can stall a pump. Plus, pumps do require a higher startup voltage when limiting the power. Sure, a DDC can barely run at 6VDC, BUT under load it can not. The more restrictions, the more power the pump needs to overcome it. Monitor your loop often until you are comfortable with the temps and the long term operation at a lower voltage. From 9VDC to 12VDC is a good range for a DDC pump. Goinglower requires a little more skill to tune the loop.
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post #7 of 21
Hi! I have just finished my first ever water cooling build using the Laing DDC-1 pump. I am displeased with the noise and seek to undervolt it as well. It emits a very vague noise, I can only describe it as a vacuum cleaner running in the neighboring apartment. Not very loud, but very intrusive. My target voltage is 9V, but adjustability would be nice. I do not want an external power supply because I don't want additional cables running to / from my PC. Using a fan controller is also out of question as I am using the 5.25" drive bays for my SSD / HDD.

An alternative would be to install a resistor, though I would like someone to confirm that my calculation is correct:

Pump specs (12V operation): P = 10W, V = 12V

I = P / V = 10W / 12V = 0,83A

R = V / I = (12V - 9V) / 0,83A = 3,6 Ohm

Dissipation:

I^2 * R = 2,5W

Any comments?
post #8 of 21
Quote:
Originally Posted by superj1977 View Post

Wonder if i can buy like some kind of variable resistor suitable for dropping voltage from 12V? hmmmm

Yes.

I have an XSPC Twin D5 Dual Bay Reservoir and it works at 7V.

I also have one of these, and it takes the 12V and knocks it down to 5V and 7V. You can use it to lower fan or pump speeds. I use it 24/7 on my Gaming/Folding rig with no issues.


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post #9 of 21
Can you please post a link to that product?
post #10 of 21
Thread Starter 
biggrin.gif

wow, thanks for all the replys guys!

Just to be clear my pump is THIS ONE, its the version with the pump built in and just a molex to power it.

What i did was to swap molex pins around so it ran off 5v and not 12v, this worked no problem at 5v and the pump started.
However.......obviously the pump was so slow its just not feasible to do 5v and i already kinda knew this.

What i then tried to do was run it at 7v by again changing around the position of the molex pins so it was connected exactly the same as you do when you run a 7v fan cable off the molex but....PSU wouldnt start up (HX1000) but my other PSU (Hiper) which is used for leak tesing let the pump run fine at 7v and it was very quiet at 7v, perfect smile.gif

So i need a way to drop down 12v from molex to around 7v-10v, is there a variable resistor i can fit between a molex from PSU and the molex on pump?

V2e30.jpg
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