General knowledge and Recurring problem about Fan

Ⅰ.Fan specifications

    use standard 12038 size 4-wire fan.

ⅰ）12038 means the fan size：120*120*38mm，as shown below

ⅱ）Fan speed and air output

The fan speed of the 17 and 19 series miners is 6000 rpm (individual rear fans are 4800 rpm, which can be replaced by 6000 rpm), and the air output is 315CFM.

Please refer to the air output and wind speed data of other models:

https://support.bitmain.com/hc/zh-cn/articles/900002654946

ⅲ）There are 4 fan power PINs

Sort in the same direction,the one marked with an arrow or a solid square is the first one ：

①cpu fan PWM：Intelligent temperature control

②cpu fan in：Speed measurement

③cpu fan PWR：Fan powered

④GND：Ground wire

Ⅱ.Troubleshooting

ⅰ）The corresponding relationship between the control board fan number and the log number is as follows.

J12, J13, J15, J14 correspond to fan_id=3, 2, 0, 1 in the log respectively.

ⅱ）The speed of the 4 fans are all 0

Generally it is a power supply problem. The 12V power supply is abnormal. Replug the 12V power cord or replace the power supply to solve it.

ⅲ）The fan is missing, the total number of fans is less than 4, or the fan speed is 0 when viewed on the user panel.

①Check the fan cable and fan extension cable for bad contact, and reinsert it, as shown in the figure below.

②The fan is damaged, replace it directly.

ⅳ) Fan speed is too low

①Check the fan cable and fan extension cable for bad contact, and reinsert it, as shown in the figure below.

②The fan is damaged, replace it directly.

ⅴ) Physical damage or vibration

As you can see from the above picture, the fan blade has been broken. In this case, it must be replaced. Damaged blades will cause the mining machine to vibrate, which will cause damage to the mining machine for a long time. There are also some fans with slight deformation, abnormal bearings, and deformation of the fan grille causing the fan blades to scratch the grille, etc., all of which have the same problem. In short, once the fan of the miner has abnormal noise or vibration, it should be replaced immediately.

ⅵ) Fan speed is too high

From the working status interface of the miner, the fan speed has reached 30,600 rpm, and the miner is still working. The fan we use is 6000 rpm, and the speed cannot reach such a high speed. It has been confirmed that there has been a problem inside this fan. If such problems are found, in order to ensure the stable operation of the miner, it is recommended to replace it directly.

ⅶ）Broken fan cable

From the above picture, the fan cable has been damaged, which may cause a short circuit with the chassis or other cables. This type of problem can generally be seen from the log that the fan is faulty, and it is generally manifested as a low fan speed or a missing fan. If such problems are found, in order to ensure the stable operation of the miner, it is recommended to replace it directly.

ⅷ）From the log or batch scanning tool, it can be found that the speed of one fan is much lower than that of the other fans.

The miner will not report an error when the above abnormality occurs, but this situation should be paid special attention to, usually because the fan has failed. Damaged fans should be detected and replaced in time to avoid batch failures during shutdown. Insufficient fans will affect the operation of the mining machine.