ADLINK NuPRO-E320 - Manual (Page 64)

50 BIOS Setup
Automatic mode
Temperature 1 Limit of OFF
When the temperature (°C) is higher than the set value, Fan1
will run at Start PWM speed. When the temperature is lower
than the set value, Fan1 will stop.
Temperature 1 Limit of Start
When the temperature (°C) is higher than the set value, Fan1
will increase its speed by Slope PWM 1 value.
Fan 1 Start PWM
Sets a value to control the fan speed between Limit of OFF and
Limit of Start. Minimum is 0 and Maximum is 127.
Slope PWM 1
The Slope PWM Value sets the rate of increase the fan speed
when the temperature is above Limit of Start.