Do the Laing DDC-1T pump, or any DDC pump get less noisy after time in operation? - Page 2 - Overclock.net

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post #11 of 60 Old 04-13-2013, 09:19 AM
 
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My DDC has a very annoying high pitched sound when run at full speed, so I drop it down to about 50% speed in the BIOS and its near silent, and still pushes enough water to not make much of a difference in cooling (2-3C at most).

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post #12 of 60 Old 04-13-2013, 09:27 AM
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No.

The older black and orange impeller DDCs are also a bit more buzzy than the latest blue or blue/orange types. The D5 has a more silent motor controller, but I've found they can be made pretty darn quiet if dialed down enough.

I haven't a clue how they could be louder than 2000RPM fans though, different tone for sure, but louder?

This is what I got in my pump noise testing round 1 when fully decoupled from the case:

pnr1-b-comparisondecoupled.png?w=614

The 35X could get way down there if dialed completely down and good at lower speeds. A DDC3.2 could also get there when a thick acetal top like the Koolance was added.

Notice the older DDC1 (black impeller) is a bit higher in noise compared to the current generation blue impellers (35x and DDC3.2), it has an older motor controller that is clearly higher in noise.

D5 with thick acetal top was pretty darn quiet though and quietest at full speed.

One thing to notice is sample variance, I tested two D5s (PMP450), the sample 2 had quite a bit of harmonics issues at certain speeds. Also notice the harmonic spikes in the 450S, this is due to sample variance and impeller imbalance, some samples are just better than others.

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post #13 of 60 Old 04-13-2013, 09:35 AM - Thread Starter
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Martin, how did you find the right terminals on the pcb on the samples you got from bmaverick? These are also from him. I made the 3 pin header based on where the pins where on the 6 header molex from your test, and they are not at the same places on the pcb.

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WC Parts (Click to show)

Loop order :
-Alphacool Cape eye Res
-Koolance PMP-450 / Laing D5 variable
-MIST radiator Extreme 2x120
-Koolance VID-AR587
-XSPC Rasa Cpu Block
-EK CoolStream RAD XTC (420) 3x140
Back to Reservoir

-1/2" Tubing
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post #14 of 60 Old 04-13-2013, 10:16 AM
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Quote:
Originally Posted by NorxMAL View Post

Martin, how did you find the right terminals on the pcb on the samples you got from bmaverick? These are also from him. I made the 3 pin header based on where the pins where on the 6 header molex from your test, and they are not at the same places on the pcb.

I have heard that before. My only guess is they changed between samples or version or something. \

Perhaps the plug changed, but the PCB is the same.

This is what I got on the PCB:
laingddc1-3.jpg?w=614&h=589

Maybe trace the wires back to the PCB and check?

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post #15 of 60 Old 04-13-2013, 10:30 AM - Thread Starter
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I did this with a multimeter.

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WC Parts (Click to show)

Loop order :
-Alphacool Cape eye Res
-Koolance PMP-450 / Laing D5 variable
-MIST radiator Extreme 2x120
-Koolance VID-AR587
-XSPC Rasa Cpu Block
-EK CoolStream RAD XTC (420) 3x140
Back to Reservoir

-1/2" Tubing
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post #16 of 60 Old 04-13-2013, 11:11 AM - Thread Starter
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I wired the 3 pin as after this


"#1 was power, #2 was RPM sensor, and #3 was ground"

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WC Parts (Click to show)

Loop order :
-Alphacool Cape eye Res
-Koolance PMP-450 / Laing D5 variable
-MIST radiator Extreme 2x120
-Koolance VID-AR587
-XSPC Rasa Cpu Block
-EK CoolStream RAD XTC (420) 3x140
Back to Reservoir

-1/2" Tubing
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post #17 of 60 Old 04-13-2013, 05:20 PM
 
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Quote:
Originally Posted by NorxMAL View Post

Still loud even when holding it in the hand redface.gif

They are louder than 4 2000 rpm fans...

Something isn't right then.
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post #18 of 60 Old 04-13-2013, 05:53 PM
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Are you running these pumps with water all the time??

#1 rule is Never Run Dry..
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post #19 of 60 Old 04-13-2013, 07:32 PM
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Quote:
Originally Posted by NorxMAL View Post



I did this with a multimeter.

interesting. The pcb (traces to pwm , rpm, and ground are different) and plug (black vs white) are different than mine. You'll just have to try combinations I suppose.

Looking at it i would guess the rpm and ground are opposite of mine but not sure..?

The two traces on the right of your seems like the larger current traces so I would start there and assume power to the far right and ground to the second from the far right as a guess.

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post #20 of 60 Old 04-14-2013, 01:27 AM - Thread Starter
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There is only 1 combination that works, even tried reverse polarities combinations.

Not sure what I can do frown.gif

Edit : A new pcb perhaps?

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WC Parts (Click to show)

Loop order :
-Alphacool Cape eye Res
-Koolance PMP-450 / Laing D5 variable
-MIST radiator Extreme 2x120
-Koolance VID-AR587
-XSPC Rasa Cpu Block
-EK CoolStream RAD XTC (420) 3x140
Back to Reservoir

-1/2" Tubing
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