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MCP35X problem

post #1 of 22
Thread Starter 
When I turned the speed of mcp35x down to 20% duty cycle in the BIOS, the water flow completely stopped and the flow meter showed zero.
However the BIOS showed the RPM is 1277-1285rpm, but the water didn't move at all.

Is it normal?

I was told that even if you get a very weak pump, you will still have a slow flow and your flow won't stop.
post #2 of 22
It's safe to run it at full speed long term.

not sure if that's normal but just turn it back up.
post #3 of 22
Thread Starter 
Quote:
Originally Posted by Yumyums View Post
It's safe to run it at full speed long term.

not sure if that's normal but just turn it back up.
noisy if full speed
not because of safety or life
post #4 of 22
I think that the pump is still running, and that it's pressure output has dropped so low that it is no longer able to overcome gravity.
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post #5 of 22
Thread Starter 
Quote:
Originally Posted by charliehorse55 View Post
I think that the pump is still running, and that it's pressure output has dropped so low that it is no longer able to overcome gravity.
great! sounds like ur explanation makes sense!
post #6 of 22
Thread Starter 
Quote:
Originally Posted by charliehorse55 View Post
I think that the pump is still running, and that it's pressure output has dropped so low that it is no longer able to overcome gravity.
oh, sorry.
but, if it is not able to overcome the gravity, why does it show 1277rpm?
post #7 of 22
Quote:
Originally Posted by homer29 View Post
oh, sorry.
but, if it is not able to overcome the gravity, why does it show 1277rpm?
What kind of flowmeter are you using ? I for example have one like this : http://www.aquatuning.us/product_inf...weradjust.html and it can only show values from 0.18 – 2.64 GPM. Maybe your flow rate at minimum pump speed is just lower than what your meter can display.
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post #8 of 22
Thread Starter 
Quote:
Originally Posted by mm67 View Post
What kind of flowmeter are you using ? I for example have one like this : http://www.aquatuning.us/product_inf...weradjust.html and it can only show values from 0.18 – 2.64 GPM. Maybe your flow rate at minimum pump speed is just lower than what your meter can display.
Haha, not only the flow meter showed, but also I can see the flow by my eyes!
I saw the water was resting
post #9 of 22
Quote:
Originally Posted by homer29 View Post
oh, sorry.
but, if it is not able to overcome the gravity, why does it show 1277rpm?
Centrifugal pumps do not require water flow to operate, even if the pump had both it's inlet and outlet sealed it could continue to spin.
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CPUMotherboardGraphicsRAM
2600k @ 5.0 GHz/1.42v ASUS P8P67 Pro MSI GTX 670 OC 20 GB/1600/7-7-7-24 
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120GB Vertex SSD Western Digital 1TB None! Ubuntu 12.04/Win8/OSX 10.8.2 
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post #10 of 22
If you have rpm, you likely still have flow and it's just lower than your flow meter can read.
If flow stopped completely, your temps will jump very quickly. If you still have flow you will only see a few degree rise in temperature.

What are your temps doing?

You really can't stop flow in a closed loop with a weak pump unless there was something like a valve to stop it, or if you were just filling it. When filling it you do have to overcome static pressure/lift, but once filled that goes away due to the return.

I think you still have flow, it's just very slow.
    
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