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WP voltage controlling issue

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nsns View Drop Down
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    Posted: 18 May 2023 at 8:15am
Hello,

My MB is B460M-ITXac, after installing a custom loop with a Laing DDC water pump, the pump can only operate at full speed.

If I chose something other than full speed in BIOS (performance, standard or silent) the pump randomly shuts down and starts again after 15-20sec maybe more at full speed again, and then repeats the process.

The pump is Laing DDC pump 12V DDC-1RT with a max power consumption 13.08W and it's connected to CHA_FAN1/WP header.




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The_Nephilim View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote The_Nephilim Quote  Post ReplyReply Direct Link To This Post Posted: 18 May 2023 at 5:01pm
Hello, are you referring to the fans or the pump speed to circulate the water?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote nsns Quote  Post ReplyReply Direct Link To This Post Posted: 18 May 2023 at 6:22pm
Hi,

I'am talking about pump speed, now it's set full speed and the problem is as described if i chose something other then that.
The pump doesn't reduce speed in other profiles only shuts down and power up in full speed after some period.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote The_Nephilim Quote  Post ReplyReply Direct Link To This Post Posted: 18 May 2023 at 8:27pm
Yes that is wierd. I am unsure if the profiles are gonna regulate the speed of the pump.. does the pump have a 4 pin connector?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote nsns Quote  Post ReplyReply Direct Link To This Post Posted: 18 May 2023 at 9:35pm
The profiles should regulate speed by decreasing voltage because I set Water Pump/DC mode for that header. The MB does support voltage regulating for water pumps. But something is not working as it should.

The pump has a Molex connector for power with 2 wires and one wire in 3 pin connector for reading speed and is connected to MB trow adapter 3pin-12v-to-4pin-molex-12v

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Post Options Post Options   Thanks (0) Thanks(0)   Quote The_Nephilim Quote  Post ReplyReply Direct Link To This Post Posted: 19 May 2023 at 12:37am
well if it is anythnig how a PWM fan is controlled you need a 4 pin small connector that goes to the motherboard..

From what you say it only has 3. I could be wrong but I think that is what might be the problem.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote nsns Quote  Post ReplyReply Direct Link To This Post Posted: 19 May 2023 at 12:50am
You are correct, but I am not trying to control the pump with PWM but with voltage control (DC).

https://www.linkpicture.com/q/Capture_127.jpg
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Post Options Post Options   Thanks (0) Thanks(0)   Quote The_Nephilim Quote  Post ReplyReply Direct Link To This Post Posted: 19 May 2023 at 1:51am
hmm well I am not sure how that works but maybe try and ask the pump manufacter.
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nsns View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote nsns Quote  Post ReplyReply Direct Link To This Post Posted: 19 May 2023 at 3:23pm
No need for that, bcs pump is working, ok?
There is simple DC motor in pump that support voltage from 6-13v and rpm of the pump can be lowered by decreasing voltage, simple as that.

I will tray to hook the pump to the psu directly with 12v--->9v regulator between them and if
that is working then problem is in Asrock voltage regulatorfor WP header.

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