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DDC 350 2 wire modded to 3 wire?

post #1 of 10
Thread Starter 
I bought this pump, not knowing it was a 2 wire. I opened it up to change the top, and noticed 4 solder posts... can I re-run a wire that has power/ground/tach on it? I am wanting to hook this up to a fan controller... or should I just let it run full bore on the 12v PSU connection?

Pics:

20121106_202300.jpg
20121106_201652.jpg
Edited by Derek1387 - 11/6/12 at 6:26pm
post #2 of 10
Quote:
Originally Posted by Derek1387 View Post

I have a Laing pump, that is 12v molex. I want to hook it up to my fan controller. It is the MCP350/355 pump.
Can I open it up and take the 2 wire off, and make it 3 wire? Is that possible? Or did i buy the wrong pump....

The 3rd wire is for a tachometer I think. Most fan controllers use 2-pin setups and vary the voltage to the pump, which slows it down or speeds it up.

You can do the same thing by switching the pins on the molex connector to the 5V input (slows the pump down).

What model fan controller do you have?
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post #3 of 10
Thread Starter 
I have a Bitfenix Recon which uses 3 pins I believe.
post #4 of 10
Thread Starter 
Anyone?
post #5 of 10
Thread Starter 
Updated with pictures...
20121106_202300.jpg
20121106_201652.jpg
post #6 of 10
Thread Starter 
Anybody?
post #7 of 10
I can't see the pictures... But it should still work with a 2-wires on a fan controller. As said before, the third wire is just PWM so you just won't get a speed reading. You may have to wire up something to adapt the output of your fan controller to your pump input.

However, your fan controller is 10w a channel, while the pump is 12w. It may struggle powering the pump.

You can always run the pump off of 12v, 5v 7v straight if you don't mind not being to control its speed. I run mine at 7v.
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post #8 of 10
Thread Starter 
Quote:
Originally Posted by kevmatic View Post

I can't see the pictures... But it should still work with a 2-wires on a fan controller. As said before, the third wire is just PWM so you just won't get a speed reading. You may have to wire up something to adapt the output of your fan controller to your pump input.
However, your fan controller is 10w a channel, while the pump is 12w. It may struggle powering the pump.
You can always run the pump off of 12v, 5v 7v straight if you don't mind not being to control its speed. I run mine at 7v.

well pooh, i didnt even realize my controller was only 10w.... i guess i will just leave it as is.

How do I mod to run at 7v?
post #9 of 10
How are you connecting the pump to the PSU? If it's a molex, simply move the Negative line on your your pump to the +5 line. You'll have the positive running to 12v, the negative running to +5, for a total of 7 volts difference. And no, it won't hurt anything because the pump is plastic bodied.
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post #10 of 10
OK, there seems to be much confusing info given here to the simple question.

The 3rd wire for fan is the Tach/speed feedback. Please refer to the Intel ATX standards .... thumb.gif You can solder a wire onto the PCB to have this report the RPM to your computer or fan controller. However, it's been too long to remember which of the two is the tach. Search the web then ...
http://www.allpinouts.org/index.php/Motherboard_(CPU)_3_Pin_Fan_Connector

The 4th wire is PWM control. The Laing DDC pump series has a proprietary PWM (Apple, Dell, HP ... BIOS controlled PWM), thus it is useless to wire that solder point. A fan controller will do just fine with the two wire, but provides nothing other than trying to listen for the pump hum or gurggling. The tach wire to the fan controller is ideal to have.

Hope this helps,

BMaverick, meeting our DDC pump info needs
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