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E9000 Server V100R001 User Guide 24

This document describes the overview, functions, structure, installation, and configuration methods of the E9000.
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Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
Fan Module Control Modes

Fan Module Control Modes

This section describes the three fan module control modes, relationship between the fan speed and temperature, and fan speed adjustment curves.

Control Modes

Fan modules are controlled in the following three modes:

  • Start mode

    When fan modules are powered on, the default fan speed is 30% and lasts for 3s. When the fan module software is initialized, fan modules enter main control mode or automatic mode based on the communication status.

  • Automatic mode

    Before communicating with the active management module, fan modules automatically adjust the fan speed based on the temperature sensor.

  • Main control mode

    After communicating properly with fan modules, the active management module adjusts the fan speed based on the temperatures of the chassis and components. Fan modules do not adjust the fan speed based on their temperatures in this mode.

Automatic Mode

The following describes the relationship between the fan speed and temperature (T in Figure 1 Fan speed curve) in automatic mode:

  • T < 35°C (95°F): The fan speed is 25%.
  • 35°C ≤ T < 65°C (149°F): The fan speed linearly changes between 25% and 100%.
  • 65°C (149°F) ≤ T: The fan speed is 100%.
Figure 2-18 Fan speed curve

Main Control Mode

Figure 2-18 shows the relationship between the fan speed and the air intake vent temperature (T) in main control mode. Other factors that affect the fan speed are not described here, such as board temperature alarms and component temperatures.

  • T < 25°C (77°F): The fan speed is 25%.
  • 25°C (77°F) ≤ T < 30°C (86°F): The fan speed linearly changes between 25% and 40%.
  • 30°C (86°F) ≤ T < 35°C (95°F): The fan speed linearly changes between 40% and 50%.
  • 35°C (95°F) ≤ T < 45°C (113°F): The fan speed linearly changes between 50% and 80%.
  • 45°C (113°F) ≤ T < 55°C (131°F): The fan speed linearly changes between 80% and 100%.
  • 55°C (131°F) ≤ T: The fan speed is 100%.
Figure 2-19 Fan speed curve
NOTE:

Possible causes of sudden increases in fan speed are as follows:

  • Certain fan units in the fan module zone are abnormal.
  • The management modules fail to obtain the temperature of the air intake vent sensor.
  • The fan modules fail to communicate with the management modules.
  • A board temperature alarm is generated or there are high-temperature board components in the fan module zone.
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Updated: 2019-08-30

Document ID: EDOC1000015897

Views: 95031

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