Hi all,

First time posting on this forum - I've posted the below on the OCUK forums,

I have a two loop WC build ran from PWM D5 pumps. The pumps are powered
direct from the PSU and controlled from my MB fan headers via my bios
fan control, running at a constant 100% speed.



I also have an aquaero 6 controlling fans, monitoring temps and most
importantly in this situation, monitoring flow rate on the aquabus which
is set to execute an emergency shutdown if the flow on either loop
drops.



OK so everything was happy days until last night when I tried to fiddle
with lowering the pump speeds. To cut a long story short, when running
on max, the MB disables PWM control (it actually states this too), but
when I lower it to anything other than 100%, it activates PWM. I can set
the pumps to an acceptable speed below the aquaero's emergency limit
BUT when I start up or reset, the MB presumably stops sending a PWM
signal to the pumps for a few seconds. I can hear the pumps spin down,
max out, then drop down to their set limit.



Unfortunately, this is enough time to trigger the aquaero alarm. From
what I can see, the aquaero software has an option to suspend all alarms
for x seconds on a boot up BUT not a reset.



There are no spare PWN fan channels on the aquaero. I could free up one without too much hassle, but before I do:



Options:

1: Can a MB maintain its PWM signal output during a reset?

2: Does the aquaero aquasuite software indeed have an option to ignore alarms on a reset as well as power on?

3: Not my favorite, but would aquasuite D5 pumps, controlled via aquaero aquabus fix all problems?



Thanks

Thanks for your reply, it encouraged me to think of it another way and I think this may be the reason:

https://community.futuremark.com/forum/showthread.php?182990-For-those-of-you-guys-using-a-D5-PWM-pump

When the pump loses signal, it defaults to 60%, not 100. As I mistakenly brought the mps400 sensors, they can only sense 80l/hr min and I suspect at 60% power, it might be just enough to go below this flow rate and read as zero.

I'll report back after some testing.

Ah that's interesting, thanks for your reply.... I'm not sure that's correct but I'll give it a go and report back. My thoughts are when I set the pump to 100% in my MB fan control, it reports saying "PWM disabled" and the pump runs 100% all the time

Otherwise its a case of buying a more sensitive flow sensor (not using them is not an option) or just leave the pump running 100%.

First world problems!

EDIT

Out of curiosity, can you modify a mps400 to a mps200??

Thought so thanks.

One more question, if I ran both pumps from an aquaero fan header, would the PWM signal get interrupted during a reset like the mobo does, or would the aquaero maintain it?

Jackson, you were correct, the pumps do indeed spin down below 60% when the PWM signal is lost. I'll just run them at 100%, my flow rate is 0.66 GPM anyway!

Hi,

It's two separate loops, so each loop has just one pump. I'm guessing it's the sheer amount of resistance, CPU loop has 6 blocks and one quad rad, GPU loop has 3 blocks, one quad and one dual rad. Each loop also has an aqua computer filter (I don't think that makes much difference tbh)

Ha yea, I know it's completely pointless, but I also cool the MB (2 blocks), RAM (2 blocks) and aquaero (1 block). And of course the CPU itself!