Octo Fan control appears to be applying 2x offset

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SirIvan

Newbie

Octo Fan control appears to be applying 2x offset

Monday, May 2nd 2022, 1:21pm

Hey all,
I just moved house and noticed that my EKWB DDC was running really fast. It's plugged into 'Fan 8' of the Octo and used to work just fine. But now it seems like the pump is running at twice the commanded percentage. E.g. at both 50% and 100% commanded, it runs at 4400RPM, but at 25% it runs at 2200RPM, and at 12% it runs at 1100RPM. I can't figure out why it's doing this...

Perhaps unrelated, but the pump is also showing Watts and Amps as zero whilst my other PWM devices are displaying correct figures.

I've attached screenshots showing the fact that 50% and 100% are the same

SirIvan has attached the following images:

InfoSeeker

Senior Member

Monday, May 2nd 2022, 1:57pm

Edit: Are you sure the pump lead is properly connected to octo 8?

This post has been edited 1 times, last edit by "InfoSeeker" (May 2nd 2022, 2:45pm)

Remayz

Senior Member

Monday, May 2nd 2022, 3:09pm

the pump draws power from the molex plug, not PWM, so you won't see any power reading.

And the EK DDC PWM range is 0-50% on the controller, so you have to set the maximum power in the octo output to 50% so that when you set it to 100% in your fan curve, it applies 50%

SirIvan

Newbie

Tuesday, May 3rd 2022, 2:50am

Quoted from "InfoSeeker"

Edit: Are you sure the pump lead is properly connected to octo 8?

Yep, I unplugged and re-plugged to check

Quoted from "Remayz"

the pump draws power from the molex plug, not PWM, so you won't see any power reading.

And the EK DDC PWM range is 0-50% on the controller, so you have to set the maximum power in the octo output to 50% so that when you set it to 100% in your fan curve, it applies 50%

Oh really? How do you find that out? Seems odd that it didn't used to be an issue (unless I'm an idiot and never noticed it...)

Remayz

Senior Member

Tuesday, May 3rd 2022, 9:55am

Well, i found out when changing my FLT360 pump from D5 to DDC that the speed behaviour was diffderent so... i just asked EK's support and they told me just that :p

The power adjustment slider in Aquasuite is precisely for that anyway. no need to redo your pump curve, just adjust the power slider from 0 to 50% and it will work as it should.

Edit : i use a DDC 4.2 pump. I don't know what yours is. this one has a different controller from the previous versions.

SirIvan

Newbie

Tuesday, May 10th 2022, 2:50am

Interesting. Any chance you could post a screenshot of your settings? I have an offset of 0.5 applied, but it resets to 1.0 everytime I shutdown the PC which is really annoying. Mine is also the 4.2

Quoted from "Remayz"

Well, i found out when changing my FLT360 pump from D5 to DDC that the speed behaviour was diffderent so... i just asked EK's support and they told me just that :p

The power adjustment slider in Aquasuite is precisely for that anyway. no need to redo your pump curve, just adjust the power slider from 0 to 50% and it will work as it should.

Edit : i use a DDC 4.2 pump. I don't know what yours is. this one has a different controller from the previous versions.