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Modifying MCP350 wires

post #1 of 19
Thread Starter 
So, had a brief moment to change the tops and take a look at some pumps I purchased for my new build and noticed the wires run a single wire to a 3 pin (tach I assume) and then 2 wires (power and ground I assume) to a 4 pin molex...

attachment.php?attachmentid=203668&stc=1&d=1301875979

attachment.php?attachmentid=203669&stc=1&d=1301875979

Would I be ok in purchasing these http://www.frozencpu.com/products/1821/ele-173/3-Pin_Power_Supply_Connector_Pins_Set.html?tl=g4c155

and then wiring them into the 3 pin fan connector? If so what order do I want to put the wires in on the connector? (Yellow is power and black is ground?)

I plan on having 2 of these pumps connected via a Y connection wire to a Sunbeam rheosmart 6 - but if this is a bad idea - would be good to know now tongue.gif
Edited by werds - 4/3/11 at 5:58pm
    
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post #2 of 19
Hold on let me check..
    
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post #3 of 19
I doubt the 3pin on your mobo has enough amperage to run the pump. Just simply doesnt have enough umpf.
post #4 of 19
cpufanpinoutlabeled.jpg
But definitely check the capacity of whatever you are plugging it into.
    
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post #5 of 19
MCP350 (DDC3.1) with an aftermarket top can draw as much as 20 watts:

http://martinsliquidlab.petrastech.com/img/DDC31-XSPC-Reservoir.png
    
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post #6 of 19
Yeah you can wire it to the 3 pin fan plug to tidy it up, but I would be careful plugging 2 of these using a y splitter into a single fan channel on your sunbeam controller. Make sure that the two pumps (combined) use less amperage/wattage than the per/channel value of the controller.
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post #7 of 19
Thread Starter 
Quote:
Originally Posted by Martinm210;12990114 
MCP350 (DDC3.1) with an aftermarket top can draw as much as 20 watts:

http://martinsliquidlab.petrastech.com/img/DDC31-XSPC-Reservoir.png

http://www.newegg.com/Product/Product.aspx?Item=N82E16811995075

Planning to plug it into this so looks like I will have to use two separate channels then?

Thanks for the help smile.gif

all +rep'd

*edit* WOW - 20watts with aftermarket top! It suddenly struck me when I was looking at the packaging and the stock pump claims 10watt power draw... boy glad I asked instead of working this out on my own!
Edited by werds - 4/3/11 at 7:24pm
    
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post #8 of 19
Thread Starter 
Quote:
Originally Posted by Martinm210;12990088 
cpufanpinoutlabeled.jpg
But definitely check the capacity of whatever you are plugging it into.

this and this old post from moots helps clarify the wiring.
Quote:
Originally Posted by Mootsfox;3056524 
The red wire on a molex is 5v, and the yellow is 12v. Then connect the ground from the fan to one of the black wires coming from the molex.

And damn I'm glad your test data is so thorough Martin!
    
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post #9 of 19
Quote:
Originally Posted by werds;12990158 
http://www.newegg.com/Product/Product.aspx?Item=N82E16811995075

Planning to plug it into this so looks like I will have to use two separate channels then?

Thanks for the help smile.gif

all +rep'd

*edit* WOW - 20watts with aftermarket top! It suddenly struck me when I was looking at the packaging and the stock pump claims 10watt power draw... boy glad I asked instead of working this out on my own!

One channel should handle it. I've got a rheosmart 3 I've been playing with. I haven't tried a pump yet, but it should be ok per specs. You would only draw 20 watts max and it's "supposed" to handle 30. You might just keep an eye on the heatsink for that channel and give it some air flow if it starts getting really hot.

I would also probably wire the RPM wire separately to the motherboard and setup either the bios or speedfan to shut down at some minimum RPM.

I'd just hate to have a controller die, pump stop working, and bad things happen without much user experience out there.

And yeah, never trust fan or pump power consumption specs. I've seen a lot of fan specs being off, and the pumps draw more when tops are added to them.
Edited by Martinm210 - 4/3/11 at 7:32pm
    
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post #10 of 19
Thread Starter 
Quote:
Originally Posted by Martinm210;12990664 
One channel should handle it. I've got a rheosmart I've been playing with. I haven't tried a pump yet, but it should be ok per specs. You would only draw 20 watts max and it's "supposed" to handle 30. You might just keep an eye on the heatsink for that channel and give it some air flow if it starts getting really hot.

I would also probably wire the RPM wire separately to the motherboard and setup either the bios or speedfan to shut down at some minimum RPM.

I'd just hate to have a controller die, pump stop working, and bad things happen without much user experience out there.

Hmmm might just go that route - was originally thinking all one wire to the rheosmart - but using the bios as a failsafe would work - I am running these in serial just for redundancy too but dead controller would definitely be harsh!
    
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