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Issue with NB eLoop B12-3 not displaying fan RPM

post #1 of 7
Thread Starter 
So I have 3 of the 1900 RPM eLoop fans on one of my rads, connected to my fan controller with a 3 way splitter. The issue I have is that the fan RPM only gets displayed at 6V speeds (around 1000 rpm). The fan starts up at around 4V, but the RPM readout on my fan controller reads 0 until I reach 6V speeds.
I tried connecting only 1 fan up at a time, tried different splitters and different channels, with the same result each time. Is it just a quirk of the eLoop fans that RPM readouts don't get displayed correctly at low volts?
post #2 of 7
I have exactly the same problem with the same fans on an Aquaero 5. It is so frustrating. I wanted these fans to be the replacements on my entire rig but they leave much to be desired.
I was contemplating getting others versions of the same fan, the PWM ones but I don't want to waste money and have the same problems.
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Kusanagi
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post #3 of 7
Thread Starter 
I found another instance of this happening, Martin tested some of these fans in one of his fan round-ups and the rpm readout wasn't working correctly.However, he only noted this in passing.
post #4 of 7
Yeah I noticed that too. Mine do exactly the same thing. At low volts they report nothing, then all of a sudden report a huge speed, then as volts increase they eventually settle down.

It seems the B12-4 that Martin tested did not suffer the same problem.

I have tried to contact Noiseblocker about the problem but have had not had any response.
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Kusanagi
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post #5 of 7
I have a number of B12-3 variants and like you have stated... once the voltage drops down under 6v, the RPM reading gets a little unstable and somewhere around 5v or so the RPM reading no longer registers - although the fans are still spinning OK.

I decided to have a closer look at this issue with my scope today and it looks as if the pulse waveform on the RPM output signal wire loses its nice square wave shape as the supply voltage drops below 6v. Once you get down to 4v, the pulse is quite distorted on the trailing edge and this is why most fan controllers cannot read the RPM at this point.

I have knocked up a small add-on circuit which restores the shape of the waveform and it seems to allow you to read RPM even when running them down to slightly under 4v. On a B12-3 fan, it permits RPM readings right down to under 800 RPM - From memory my fan was being driven with around 3.8v at this point.

Note that I have been testing my circuit with an Aquaero 6XT controller so results may vary with other brands of fan controllers.

The circuit is very simple [less than $2 worth of parts] so if anyone is interested, I can post up a pic of the schematic.
Edited by Costas - 5/30/14 at 4:50am
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post #6 of 7
Please post schematic, I hope u still reading this
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post #7 of 7
A tad late.... however - here it is for future reference....

X1 three pin header is where the fan plugs in and X2 header is where the fan controller's fan channel is connected to.

Corsair 900D
(12 items)
 
Déjà vu
(16 items)
 
 
CPUMotherboardGraphicsGraphics
I7-6700K ASUS Maximus VIII Formula EVGA 980Ti Classified EVGA 980Ti Classified 
RAMHard DriveHard DriveCooling
Corsair CMD32GX4M4B3200C16 Samsung 512GB 950 Pro M2 Samsung 1TB 850 Pro Custom 
OSMonitorKeyboardPower
Win 10 ASUS PG278Q Corsair K70 RGB Corsair AX1500i 
CaseMouseAudioOther
Caselabs SMA8 Razer Deathadder 2013 On-Board Aquacomputer Aquaero 6XT 
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Corsair 900D
(12 items)
 
Déjà vu
(16 items)
 
 
CPUMotherboardGraphicsGraphics
I7-6700K ASUS Maximus VIII Formula EVGA 980Ti Classified EVGA 980Ti Classified 
RAMHard DriveHard DriveCooling
Corsair CMD32GX4M4B3200C16 Samsung 512GB 950 Pro M2 Samsung 1TB 850 Pro Custom 
OSMonitorKeyboardPower
Win 10 ASUS PG278Q Corsair K70 RGB Corsair AX1500i 
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