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MCP35x Pump Connection? - Page 4

post #31 of 40
Quote:
Originally Posted by mm67 View Post
Yes, but I still don't understand what you gain by doing that, your PSU has no spare Molex connectors ?
The problem is that mobo can't control the pump unless all four wires are connected to mobo fan header. When i say control i mean both manual and automatic. Where manual is not working with only two wires of PWM header.
post #32 of 40
Quote:
Originally Posted by Artem View Post
The problem is that mobo can't control the pump unless all four wires are connected to mobo fan header. When i say control i mean both manual and automatic. Where manual is not working with only two wires of PWM header.
That's strange, I've have been using this pump with a Gigabyte P45 and an Asus X58 board, both can control it just fine even though power comes from Molex.
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post #33 of 40
Quote:
Originally Posted by Artem View Post
The problem is that mobo can't control the pump unless all four wires are connected to mobo fan header. When i say control i mean both manual and automatic. Where manual is not working with only two wires of PWM header.
If the motherboard has more than one 4 pin PWM fan header, try a different one.
On my Asus P6X58D-E, The CPU_Fan header can pass a PWM signal to any number of PWM fans/pumps that are powered by molex connectors off the PSU.
For PWM control to work off the CHA_Fan header on my board, the fans have to be getting their power from the header, they just run at 100% if powered by the PSU.

I think it is a polarity issue. One of these days I'm going to try switching a couple of wires in the molex connector on one of my Akasa PWM splitter cables and see if it allows me to use the CHA_Fan header for just a PWM control output.

Currently my solution to the problem is to use the PWM signal from the fan header on my graphics card to control my two MCP35x pumps, and the PWM output from the CPU_Fan header to control my 9 radiator and case fans.
All of my pumps and fans get their power directly from the PSU, and PWM speed control signal from the graphics card or CPU_Fan header.

One of these days I plan to put together a custom wiring harness for it all, but for now I'm using 5 Akasa PWM splitter cables. There are a crapload of wires bundled up on the unseen side of my motherboard tray, fortunately my case gives plenty of room to tuck it all there out of sight.
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post #34 of 40
Ok, so i can confirm it. I have powered mcp35x pump via motherboard CPU header. no problem running it at full speed.

No i have access to manual pump control via PWM. The pump starts dropping speed with Duty cycle below 50%. At 20% pumps start to make additional noises and vibrates noticeably.
post #35 of 40
Quote:
Originally Posted by Artem View Post
Ok, so i can confirm it. I have powered mcp35x pump via motherboard CPU header. no problem running it at full speed.

No i have access to manual pump control via PWM. The pump starts dropping speed with Duty cycle below 50%. At 20% pumps start to make additional noises and vibrates noticeably.
That doesn't sound right, what happens if you drop duty cycle to 0%, pump should run at about 1300 rpm and be very quiet.
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post #36 of 40
I will continue experiments tomorrow.
post #37 of 40
Quote:
Originally Posted by Artem View Post
I will continue experiments tomorrow.
I'm asking because I think that you may be running your pump with voltage control instead of PWM. If your pump stops at 0% duty cycle then I'm pretty much sure of that.
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post #38 of 40
The BIOS settings of CPU header are set to PWM. Same shows Speedfan in Advanced tab.
post #39 of 40
So what happens with duty cycle at 0 %, at 20 % my pump runs something close to 2000 rpm and at 0 % it slows down to about 1300 rpm.
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Shinobi XL
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post #40 of 40
I did not try running it at 0%. Yes, at 20% i get something around 2k RMP too.

Edit: every thing is fine. at 0% i get 1318 RMP
Edited by Artem - 5/25/11 at 1:01pm
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