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Fans
============

PWM Fan
-----------

There are 3 PWM fans on the Pironman 5 Pro MAX.

The PWM fan on the Pironman 5 Pro MAX is controlled by the Raspberry Pi system.

Regarding cooling solutions for the Raspberry Pi 5, especially under heavy load, the design of the Pironman 5 Pro MAX incorporates a smart cooling system. It features a primary PWM fan and two supplementary RGB fans. The cooling strategy is closely integrated with the Raspberry Pi 5's thermal management system.

The PWM fan's operation is based on the Raspberry Pi 5's temperature:

* Below 50°C, the PWM fan remains off (0% speed).
* At 50°C, the fan starts at a low speed (30% speed).
* Reaching 60°C, the fan increases to a medium speed (50% speed).
* At 67.5°C, the fan ramps up to a high speed (70% speed).
* At 75°C and above, the fan operates at full speed (100% speed).

This temperature-to-speed relationship also applies when the temperature decreases, with a 5°C hysteresis. The fan speed reduces when the temperature falls 5°C below each of these thresholds.

* Commands to monitor the PWM fan. To check the PWM fan's status:

  .. code-block:: shell
  
    cat /sys/class/thermal/cooling_device0/cur_state

* To view the PWM fan's speed:

  .. code-block:: shell

    cat /sys/devices/platform/cooling_fan/hwmon/*/fan1_input

In the Pironman 5 Pro MAX, the PWM fan is a critical component for maintaining optimal operating temperatures, particularly during intensive tasks, ensuring the Raspberry Pi 5 runs efficiently and reliably.

**Fan Specifications**

.. image:: img/size_fan.png

* **Extermal dimension**: 40*40*10MM
* **Rated Input power**: 5V/0.106A
* **Rated Speed**: 4000RPM
* **Weight**: 13.5±5g/pcs
* **Life**: 30,000 hours (room temperature 25°C)
* **Accoustic Sound**: 22.31dBA
* **Maximum Air Flow**: 2.46CFM
* **Max.Air Pressure**: 0.62mm-H2O
* **Operating Temperature**: -10℃~+60℃
* **Storage Temperature**: -20℃~+70℃

**Pin Definitions**

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   * - Pin
     - Color
     - Description
   * - 1
     - Blue
     - PWM signal for controlling fan speed
   * - 2
     - Red
     - 5V power supply
   * - 3
     - Black
     - Ground
   * - 4
     - Yellow
     - Date in of internal RGB LED
   * - 5 
     - Green
     - Date out of internal RGB LED


Tower Cooler
----------------------------

The Pro MAX, the tower cooler is a high-performance cooling solution designed to keep your Raspberry Pi 5 at optimal temperatures during demanding tasks. It features a large aluminum heat sink and a fan that can be controlled via PWM to adjust cooling performance as needed. The tower cooler is compatible with the Raspberry Pi 5 and can be easily installed using the included screws and mounting bracket.


.. image:: img/size_tower_cooler.png

**Warning**

Do not touch the blades, or let the power wires wrap around the fan, or pull the power wires with force to avoid damaging the fan.

Do not use in environments with flammable gases or any danger.

When the fan is working, please do not try to lock the fan for a long time. If you do so, the fan will burn out due to the high heat generated by the continuous stoppage.

When assembling the fan, please pay special attention to the noise generated by resonance or vibration.

Do not drop the Icecube Tower Cooler from height, as this may affect the balance of the fan’s blades.