# How S6700 switches adjust their FAN Speed

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The display fan speed-adjust threshold minus command displays the temperature thresholds for fan speed adjustment. The switch will detect the temperature every 30 seconds, the temperature ranges and steps for adjusting the fan speed are based on the experimental results in lab, at the beginning the fan speed is 55%:
1)If after two times of detections (30 seconds x 2=60seconds), every time the temperature remains higher than 60 degrees, the fan speed will increase from 55% to 60%; If after two times of detections (30 seconds x 2=60seconds), every time the temperature remains lower than 60 degrees, the fan speed will remain at 55%.
2)If after two times of detections (30 seconds x 2=60seconds), every time the temperature remains higher than 60 degrees, the fan speed will increase from 60% to 65%; If after two times of detections (30 seconds x 2=60seconds), every time the temperature remains lower than 55 degrees, the fan speed will decrease from 60% to 55%.
3)If after two times of detections (30 seconds x 2=60seconds), every time the temperature remains higher than 58 degrees, the fan speed will increase from 65% to 70%; If after two times of detections (30 seconds x 2=60seconds), every time the temperature remains lower than 56 degrees, the fan speed will decrease from 65% to 60%.
4)If after two times of detections (30 seconds x 2=60seconds), every time the temperature remains higher than 56 degrees, the fan speed will increase from 70% to 80%; If after two times of detections (30 seconds x 2=60seconds), every time the temperature remains lower than 54 degrees, the fan speed will decrease from 70% to 65%.
5)If after two times of detections (30 seconds x 2=60seconds), every time the temperature remains higher than 56 degrees, the fan speed will increase from 80% to 90%; If after two times of detections (30 seconds x 2=60seconds), every time the temperature remains lower than 52 degrees, the fan speed will decrease from 80% to 70%.
6)If after two times of detections (30 seconds x 2=60seconds), every time the temperature remains higher than 56 degrees, the fan speed will increase from 90% to 100%; If after two times of detections (30 seconds x 2=60seconds), every time the temperature remains lower than 53 degrees, the fan speed will decrease from 90% to 80%.
7)If after two times of detections (30 seconds x 2=60seconds), every time the temperature remains higher than 54 degrees, the fan speed will remain at 100%; If after two times of detections (30 seconds x 2=60seconds), every time the temperature remains lower than 54 degrees, the fan speed will decrease from 100% to 90%.

Please be noted the fan speed can only be adjusted step by step, it can’t be jumped more than 1 step, for example, it can’t be adjust from 65% to 55 in one step.

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