2.7A Fan issue - S7/S9

[babycicak]

Hi, Im changing my fan to 2,7A, with 6000rpm, after change, the miner both s7/s9 cant detect the fan., red light on after 5 min and machine stop hashing. Anyone have same problem before? please help.

[flameruk]

Hi, Im changing my fan to 2,7A, with 6000rpm, after change, the miner both s7/s9 cant detect the fan., red light on after 5 min and machine stop hashing. Anyone have same problem before? please help.

Does your new fan have 3-Wires?
Needs to feed a tachometer signal back to the controller card.
In times of need I've put a fan on the miner and connected to the power supply direct.
Then I've left an old fan plugged on the controller and cable tied it up in the rack.
New fan moves air at full power, old fan keeps the controller happy.

Apart from that what is the model of the fan you got?
Delta do one which is the same as the S9 OEM fan but hard to get here in the UK.

[fanatic26]

I remember buying a bunch of delta fans to add fans to our S7-LN machines and to get them to read we had to swap the two data wires so the s7 could read them

[HagssFIN]

Is the pin order same? If not, you'll need to carefully with a small screw driver remove pins and then re-attach them to the connector in a correct order.
I have done this once for Sunon MagLev fan and it is possible with a correct tool for the job.

[NotFuzzyWarm]

I remember buying a bunch of delta fans to add fans to our S7-LN machines and to get them to read we had to swap the two data wires so the s7 could read them

Ah ha! That explains the Delta datasheet I just looked at for their newest fans. Their wiring diagram showed yellow as the PWM command and blue as feedback which is the reverse of most fan wire colors....

Thought they may have screwed up the diag or I was going nuts...

The other possible 'gotcha' is that there are 2 styles of PWM control and of course they are also the reverse of each other: 1 uses zero or very low pulse duty-cycle = full speed and as duty-cycle increases the fan slows down. This is safest because if the command wire is cut or shorts the fan runs a full speed. The other control method is 100% duty-cycle = 100% speed. Anyone ever check to see which Bitmain uses?

[babycicak]

you are right, i switch between yellow and blue wire, and it's work now!

I remember buying a bunch of delta fans to add fans to our S7-LN machines and to get them to read we had to swap the two data wires so the s7 could read them

Ah ha! That explains the Delta datasheet I just looked at for their newest fans. Their wiring diagram showed yellow as the PWM command and blue as feedback which is the reverse of most fan wire colors....

Thought they may have screwed up the diag or I was going nuts...

The other possible 'gotcha' is that there are 2 styles of PWM control and of course they are also the reverse of each other: 1 uses zero or very low pulse duty-cycle = full speed and as duty-cycle increases the fan slows down. This is safest because if the command wire is cut or shorts the fan runs a full speed. The other control method is 100% duty-cycle = 100% speed. Anyone ever check to see which Bitmain uses?

[RadekG]

I remember buying a bunch of delta fans to add fans to our S7-LN machines and to get them to read we had to swap the two data wires so the s7 could read them

Ah ha! That explains the Delta datasheet I just looked at for their newest fans. Their wiring diagram showed yellow as the PWM command and blue as feedback which is the reverse of most fan wire colors....

Thought they may have screwed up the diag or I was going nuts...

The other possible 'gotcha' is that there are 2 styles of PWM control and of course they are also the reverse of each other: 1 uses zero or very low pulse duty-cycle = full speed and as duty-cycle increases the fan slows down. This is safest because if the command wire is cut or shorts the fan runs a full speed. The other control method is 100% duty-cycle = 100% speed. Anyone ever check to see which Bitmain uses?

Bitmain uses no-wire = 100% speed. I removed bloue PWM pin from fan during Antminer S5 overheat times. It forced the fan to run at 100% speed regardless of firmware fan control bug.