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Prophya DC12-400 too much for Octo? Getting short circuit alarm

willmackey

Newbie

Prophya DC12-400 too much for Octo? Getting short circuit alarm

Wednesday, May 21st 2025, 8:13pm

Like the title says, trying to control Prophya DC12-400 pump with Octo but I get instant short circuit alarm when I connect the 3-pin connector. Pump works fine when powered some other way.
The pump should draw maximum of 1.8A and I have startup boosts off so it should be just within the limits of single channel.

E: Well ok I just noticed that this 80€ controller doesn't even do voltage regulation so kinda pointless exercise anyway.

This post has been edited 1 times, last edit by "willmackey" (May 21st 2025, 9:09pm)

InfoSeeker

Senior Member

Wednesday, May 21st 2025, 11:20pm

Yes, most everything is PWM controlled these days, you will need an aquaero 6 for voltage control.
I recommend the AQUAERO 6 LT, as it can be squirreled away most any place.
All aquaeros have the same functions, the only difference is the display bezel.

EDIT:
The POWER ADJUST 3 may also be an option for you.

This post has been edited 1 times, last edit by "InfoSeeker" (May 21st 2025, 11:26pm)

Shoggy

Sven - Admin

Thursday, May 22nd 2025, 9:07am

Pumps can have a high starting current when they spin up. This can easily be much more than the official maximum rating. Although this is only a fraction of a second, it is enough to trigger the overload protection.

willmackey

Newbie

Thursday, May 22nd 2025, 11:20am

Yeah I know it can spike and thought about adding some caps to help it. Didn't measure what it peaks tho and anyhow as Octo can do nothing for the control side, i'll just forget it. Still strange as some old mobos were easily able to drive this pump.
Anyhow I'll just use a dc-dc step down controller from 12V line to set some constant rate for it and connect only tach signal to Octo for monitoring. It's not like I really need to adjust pump rate anyway, but it would have been nice to get rid of extra components.

Shoggy

Sven - Admin

Thursday, May 22nd 2025, 1:43pm

Mainboards usually do not have advanced protection features. It would simply burn out at some point. This does not have to happen immediately. Imagine a bridge that is designed for a load of 10 tons and a truck with 15 tons regularly drives over it. This may work for a certain amount of time, but it leads to rapid wear and and a possible failure in the end.

willmackey

Newbie

Thursday, May 22nd 2025, 1:59pm

It did fine >5 years :) Current mobo however refused to feed it but fan outs on this were rated for much lower load anyway. I think my previous mobo had a dedicated pump out.
I checked that D5 (which I suppose is most popular choice still these days) draws up to 2A too, so I wonder why AC didn't account for pump current draw with these quite expensive controllers.

This post has been edited 1 times, last edit by "willmackey" (May 22nd 2025, 2:05pm)

Shoggy

Sven - Admin

Thursday, May 22nd 2025, 2:19pm

Why should we? - There are other devices for this purpose.

PWM controlled pumps are meant to be powered directly by the PSU and usually also do not come with a fan plug to power them that way. So, why should a PWM only controller be able to power such a pump if it cannot control the pump anyway...

In the end we are talking about two very different types of controllers: PWM controlled vs voltage controlled.

willmackey

Newbie

Thursday, May 22nd 2025, 3:27pm

Well fair enough, tho in this case I mostly meant PWM controlled ones as there are some using single 4 pin connector (e.g. EK DDC) and anyway for this price I'd assume not have such limitations and that's merely my 2 cents.
But I'm not here to pick a fight. It is what it is and works for what it's meant for.

Remayz

Senior Member

Thursday, May 22nd 2025, 7:20pm

I believe the EK DDC 4.2 are still SATA powered (mine is). only some lower performance ones are powered by the controller, probably tuned for that purpose actually.

But yea, for your application, a poweradjust with a heatsink would most likely eat that pump for breakfast

@Shoggy, somewhat related question, kind of, not really ^^' do you have any insights being in the business as to why the Xylem DDC has become almost impossible to find? did they discontinue it or are planning to replace that pump with a new model? I haven't seen a PWM model in stock since last year.

willmackey

Newbie

Thursday, May 22nd 2025, 7:51pm

I have this thumb nail size 1€ buck step down converter to adjust the voltage/rpm of the pump. Cheap and effective (no need for heatsinks). No need for anything fancier in this case either. I just like to minimize components so would have thrown the converter out as I got the Octo, but in there it stays.

This post has been edited 1 times, last edit by "willmackey" (May 23rd 2025, 8:30am)

Shoggy

Sven - Admin

Friday, May 23rd 2025, 8:59am

Quoted from "Remayz"


@Shoggy, somewhat related question, kind of, not really ^^' do you have any insights being in the business as to why the Xylem DDC has become almost impossible to find? did they discontinue it or are planning to replace that pump with a new model? I haven't seen a PWM model in stock since last year.

No, we have no insight why they are hard to get at the moment. I doubt that they discontinue this pump series.

vvv850

Junior Member

Monday, May 26th 2025, 10:07pm

What about the D5 pumps. Seems out of stock at aquacomputer also for a while now.

Shoggy

Sven - Admin

Tuesday, May 27th 2025, 8:51am

We have many of them in stock. The D5 NEXT and D5 PWM are missing electronic parts, which have longer delivery times. It has nothing to do with the pump itself.

vvv850

Junior Member

Wednesday, May 28th 2025, 10:16am

I was mainly referring to Aqua Computer D5 pump motor with PWM input and speed signal. I see only the rotary knob controlled one. Thanks

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