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[SOLVED] Noisy Laing DDC-1 troubleshooting

post #1 of 17
Thread Starter 
Hi everyone.

A couple of weeks ago I posted a thread on the topic of undervolting the Laing DDC-1 pump as I thought my pump was too noisy. The thread can be seen here.
I got a response suggesting building a LM317 circuit - which I have built. While it works, I have several problems with it, one being the potentiometer running quite hot during operation but most importantly that the noise persists, though with a different pitch.

I may be too demanding, but based on the reviews and general perception of the pump I really do think my pump is too loud.

I have researched the topic of noisy DDC-1 pumps quite a bit, but found that nearly all of the cases it comes down to isolation / proper placement. Mine is noisy even while being held in the hand, so placement / isolation is definately not the case. The EK reservoir top is not mounted too tightly to cause the issue.

Having tried the all possible options I could find without luck, I fear that I may have gotten a bad sample. Before dismounting and shipping it anywhere I would like you to check out the video I have recorded of the pump / noise. Details of the recording is in the video description.

VIDEO LINK

Is my pump really too noisy or is it really just the way it is?

Best regards
post #2 of 17
How far are you undervolting? It would be best to somehow check the RPM of the pump itself and compare to the RPM at stock voltage.
My 355s also make that noise, but it pretty much disappears once I undervolt enough (from 4500 RPMish to 3200).
The pitch should be decreasing as well, the more you undervolt. Just make sure that's what's happening.
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post #3 of 17
Thread Starter 
Thanks for the response!
My pump is running at 3900 rpm (12V / stock) in the video, and 3600 rpm with the least amount of resistance applied with the LM317 circuit. This makes a slight difference. I have yet to boot the system (thus being able to measure rpm) with a more significant amount of resistance because I'm afraid that either the pump won't have enough voltage to start, or it will fail on me ( it did once during test run). I will have to find a compromise between safe working conditions and noise it seems..
post #4 of 17
I listened to your video. I don't really hear anything I did not expect to hear. I am sensitive to frequencies others are not. I have replaced power supplies, pumps and fans due to higher pitched whines others claim they cannot hear. I would advise you to listen to other videos for comparison. Google DIYINHK PCBs (replacement pump pcbs) for some good sound byte.
Don't really expect a huge change from 3900 to 3600 rpm.
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post #5 of 17
Thread Starter 
Its not that I expected a marginal change from 3900 -> 3600 RPM, its just what I have tried with the system running. When I get home I will try adjusting the RPM to around 3000 and check the noise and if it starts properly with a system boot. If it is still not satisfactory, do you have any suggestions for a replacement pump?
post #6 of 17
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post #7 of 17
There is a difference in controller noise output between these earlier DDC1 series with black impeller and the newer DDC3 series with a blue impeller. The 1s are more "buzzy" where the 3s seem to smooth out that buzziness. Everyone has a different tolerance to noise depending on the install and the decoupling from the case, but don't expect complete silence from a DDC1 pump.

I have two systems in our house. One has a koola ce rp402x2 with a koola ce pmp400 or DDC 3.25. I run yate loon slow speed fans and happy with the pump at full speed as it seems covered by fan noise.

My other system is an open test bench and any DDC at full speed is way too loud but I also idle fan speeds to 800rpm. I run a 35x at 20% which is what I need for that system, a D5 setting 2 would also be acceptable there.

Each system and fan combo is key to what noise level you are happy with in additon to decoupling from the case. Burying the pump deep in a case or with a thick acetal pump top also doesn't hurt. Mask the noise and blend it with an equal fan noise seems to be key but the DD1 is not as silent as the newer blue impeller brothers.

If you cant find happiness...buy a D5 and dial her down to setting 2 and sell the old pump. There is also a PWM D5 flavor these days as a programmable option. An mcp35x is also a PWM option if you want lots of power too.
    
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post #8 of 17
Quote:
Originally Posted by Martinm210 View Post

If you cant find happiness...buy a D5 and dial her down to setting 2 and sell the old pump. There is also a PWM D5 flavor these days as a programmable option. An mcp35x is also a PWM option if you want lots of power too.

Can't hear my D5 on setting 2 wink.gif Or at least its not noticable over any of my fans.
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post #9 of 17
Thread Starter 
Quote:
Originally Posted by Martinm210 View Post

There is a difference in controller noise output between these earlier DDC1 series with black impeller and the newer DDC3 series with a blue impeller. The 1s are more "buzzy" where the 3s seem to smooth out that buzziness. Everyone has a different tolerance to noise depending on the install and the decoupling from the case, but don't expect complete silence from a DDC1 pump.
I have two systems in our house. One has a koola ce rp402x2 with a koola ce pmp400 or DDC 3.25. I run yate loon slow speed fans and happy with the pump at full speed as it seems covered by fan noise.
My other system is an open test bench and any DDC at full speed is way too loud but I also idle fan speeds to 800rpm. I run a 35x at 20% which is what I need for that system, a D5 setting 2 would also be acceptable there.
Each system and fan combo is key to what noise level you are happy with in additon to decoupling from the case. Burying the pump deep in a case or with a thick acetal pump top also doesn't hurt. Mask the noise and blend it with an equal fan noise seems to be key but the DD1 is not as silent as the newer blue impeller brothers.
If you cant find happiness...buy a D5 and dial her down to setting 2 and sell the old pump. There is also a PWM D5 flavor these days as a programmable option. An mcp35x is also a PWM option if you want lots of power too.

Thanks for the thorough response! While my pump was sold as a DDC-1 it does have the blue impellor (bought as new one month ago). Doesn't change the noise though, and it seems to be the way the DDC-1 sounds. I did however lower the RPM to ~3400 with my home made voltage regulator, as that was about the best compromise I could find between noise and safety of operation (proper start up, heat dissipation of voltage regulator), and it did make an audible difference. I'm running extremely silent fans though (Noctua NF-P12 at 900 RPM), so there is not much sound masking to be had from those.

At least it has been confirmed that the DDC-1 is rather noisy in general, and I can work from there rather than worrying about a faulty pump. The next step will have to be running one or two fans at a higher RPM to see if I can get a more pleasant noise characteristic.

I did not know that the D5 had an onboard speed controller, wish I knew that prior to buying my water cooling setup. At least I know what to get for my next water cooling build.

Thank you all very much for all your inputs, I will mark this thread as solved.
post #10 of 17
Quote:
Originally Posted by Calundann View Post

Thanks for the thorough response! While my pump was sold as a DDC-1 it does have the blue impellor (bought as new one month ago).

A DDC-1 with a blue impeller is a mixed component pump. The inlet on the blue impeller is much smaller than the black impeller. The old DDC-1 tops have a widerinside hole to dump the fluid into the impeller. Placing a blue impeller in there could cause more noise as it splashes on the blue impeller rather than flowing into the blue impeller hole.

Also, the blue impeller has different internal fins/vanes for directing the fluid into the pump's volute towards the outlet fitting vs. a black impeller. So, chances are, the blue impeller isn't running well in the older pump generation. The blue impeller need to run in a DDC-3 series pump. A black impeller in the DDC-1 series pump.

One other item to note, the blue impeller has a different magnetic field than the black impeller since the blue impeller is to run in an 18W rated pump.

So, don't fully blame that all DDC-1 or a DDC-1T pumps are always noisy like yours. If you can find a black impeller, swap it into your pump.
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