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Routers that support temperature monitoring will display temperature reading. In CLI/Winbox it will display degrees Celsius. Using scripts/API/SNMP this value will be shown in CLI/Winbox multiplied by 10. There are various temperature sensors depending on the device. These sensors may refer to: cpu-temperature, pcb-temperature, sfp-temperature. Device tested ambient temperature range you can find in specification description at mikrotik.com. Tested ambient temperature range is temperature in which device can be physically located. It is not the same as temperature which reports system health monitor!
Fan control and
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behavior
/system health set
Using this menu users will be able to control fan behaviour on TILE architecture devices. Currently, for other RouterBOARD devices, there is no option to manually control FAN behaviour.
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For devices with PWM fans, the speed will linearly increase or decrease from 9..88% (note: below 100W the fan RPM=0)
Limited manual fan-control option
Note: Starting from RouterOS version 7.9beta4 limited manual fan-control options have been added for CRS3xx, CRS5xx and CCR2xxx devices.
Fan behavior can be manipulated using the settings section of system health:
/system health settings set Available parameters are described below:
| Parameter | Description |
|---|---|
| fan-full-speed-temp | Sets the temperature value upon which the fan speed will be increased to the maximum possible rpm. Reads temperature from CPU, PHY, SWITCH and SFP and adjusts fan speed based on the component with the highest temperature. Value range for this setting is -273 to 65 |
| fan-target-temp | Sets the target temperature for the hottest component. Based on this setting adjusts fan behavior to hold temperatures in target range. Value range for this setting is -273 to 65 |
| fan-min-speed-percent | Sets the minimum percentage of fan speed thus not allowing fans to have a lower rpm than this value. Value range for this setting is 0 - 100 |
| fan-control-interval | Sets the actual temperature data read interval to get temperature values from CPU, PHY, SWITCH and SFP. Value range of this setting is 5 to 30 *NOTE: THIS SETTING DIRECTLY AFFECTS CPU USAGE |
CPU and SFP temperature
If CPU or SFP temperatures exceed 58C, the fans will start to spin. The higher the temperature, the faster the fans will spin. For devices with PWM fans, as the CPU or SFP temperatures exceed 58C, the fans will linearly increase their RPM to try to keep the temperature at 58C if possible. For devices with DC fans, as the CPU or SFP temperatures exceed 58C, the fans will start spinning but at a higher minimum RPM by default. This may result in cooling the device to the point where the fans turn-off completely. After which the temperature may slowly increase to 58C and the fans will turn on again. Currently, there is one exception. The S+RJ10 modules have a temperature threshold of 65C before they trigger the fans. Since it's a higher temperature threshold, the fans will start spinning at a higher initial speed to cool the device.
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