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Unexpected Behavior

Montag, 14. März 2022, 20:34

Hi,

I just got my Octo integrated into my system and I'm having some unexpected behavior when I set up a fan to be controlled by the delta between ambient and coolant temp.

Here is a screen shot of my setup after I changed the fan to have the delta as the control input for the fan speed. As can be seen in the graph, the fan is spiking speed then dropping. It does not seem to be obeying the curve that is set. If I change it to just be controlled by coolant temp, then the fan does not show those spikes. (That's the smooth part on the fan graph before I switched it to the temp delta as control.)



Any help is appreciated!

Dieser Beitrag wurde bereits 2 mal editiert, zuletzt von »sailing_nut« (14. März 2022, 21:24)

Montag, 14. März 2022, 20:49

I tried your link but it says I have to request access. I am not sure if you can make a Google Drive link open to anyone, or if you want to. I did request access with a note saying I got the link from this forum post.

Dieser Beitrag wurde bereits 1 mal editiert, zuletzt von »Speedy-VI« (14. März 2022, 20:51)

Montag, 14. März 2022, 20:55

I tried your link but it says I have to request access. I am not sure if you can make a Google Drive link open to anyone, or if you want to. I did request access with a note saying I got the link from this forum post.
I THINK I fixed the link in the original post....

Remayz

Senior Member

Montag, 14. März 2022, 21:07

can't see it.
maybe try imagebam, or an other image sharing service. they even give youBBcode links to embed that, right into the forum :)

your two sensors are connected straight to the octo? or is one connected on another device, or the motherboard for example?

If one of the sensor is lost from time to time, the fan will lose its control variable and speed up to its default backup speed.
That could cause the spiky behaviour you see, and be caused by something outside of the Octo

Montag, 14. März 2022, 21:20

can't see it.
maybe try imagebam, or an other image sharing service. they even give youBBcode links to embed that, right into the forum :)

your two sensors are connected straight to the octo? or is one connected on another device, or the motherboard for example?

If one of the sensor is lost from time to time, the fan will lose its control variable and speed up to its default backup speed.
That could cause the spiky behaviour you see, and be caused by something outside of the Octo
Here is another try:

Both sensors are connected directly to the Octo, so the sensor loss is probably not the issue. However, my being very new to Aquasuite is probably the issue, just not sure what I might have done wrong....

Dieser Beitrag wurde bereits 2 mal editiert, zuletzt von »sailing_nut« (14. März 2022, 21:22)

Remayz

Senior Member

Montag, 14. März 2022, 23:24

duh, seems to be the zero RPM mode of your fans i guess.
When you set the curve to water temp, you have values up in the 25 - 35°, which is high in the fan curve.

When you use delta T°, the value is very small, and you approach 0% PWM. when the fan controller receives that, it kicks on at full speed.

You'll have to change that fan curve. it is waaaaay too low.

As a starting point you could set the lowest speed at about 20 - 25% PWM for, say 2 or 3°C temperature. that's close to the lowest delta T you can have.

Under load, depending on what gear you have, and how many rads, you may want to set the fastest fan RPM (100% PWM) at 15 - 20°


try that then adjust to taste, to have better temps, or lower noise.

Edit :
I didn't explain ^^

On the automatic curve setup where you are now, enter the values i gave you as a starting point
Minimum temperature 2°
Minimum power : 25
Maximum temperature : 20°
Maximum power : 100

And set the curve shape slider in the middle (straight line).

See how it goes :)

Dieser Beitrag wurde bereits 1 mal editiert, zuletzt von »Remayz« (14. März 2022, 23:31)

Dienstag, 15. März 2022, 01:28

@Remayz

Thanks for the information! I tried the settings you gave me but the behavior was the same. I saw that in the status section the output was spiking to 100% then dropping.

I then saw that I had messed about with the minimum (5%) and maximum (35%) power in the fan setup. I changed the maximum to 100% and the fan is behaving as expected and following the curve.

Dienstag, 15. März 2022, 09:14

@Remayz

Thanks for the information! I tried the settings you gave me but the behavior was the same. I saw that in the status section the output was spiking to 100% then dropping.

I then saw that I had messed about with the minimum (5%) and maximum (35%) power in the fan setup. I changed the maximum to 100% and the fan is behaving as expected and following the curve.


Also try ticking "Hold Minimum Power" towards the bottom of the config screen. Some fans dont like to fall to low percentages

Dienstag, 15. März 2022, 13:03

@Remayz

Thanks for the information! I tried the settings you gave me but the behavior was the same. I saw that in the status section the output was spiking to 100% then dropping.

I then saw that I had messed about with the minimum (5%) and maximum (35%) power in the fan setup. I changed the maximum to 100% and the fan is behaving as expected and following the curve.


Also try ticking "Hold Minimum Power" towards the bottom of the config screen. Some fans dont like to fall to low percentages
Thanks WinstonWoof! I have EK Vardar fans and they are fine going all the way to 0% (At least experimentally I determined that.)

Remayz

Senior Member

Dienstag, 15. März 2022, 14:53

my bad, vardar fans stop below 25%

try setting minimum power to 26 ?

Dienstag, 15. März 2022, 15:57

Not all vardar fan behave the same, there are quite a few versions. There is also a hysteresis - after the fan stops it will need a higher duty to restart, than the minimum duty it can still work at.

Dienstag, 15. März 2022, 21:18

my bad, vardar fans stop below 25%

try setting minimum power to 26 ?

I would just leave min power at 5% initially but also tick "Use Start Boost"

if still problematic then switch to 25/26% minimum

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