Setting for PI Control
When using PI control, the control value is calculated by the PI algorithm and then transmitted to the controller. The controller switches the fan or switch the fan speed according to the preset threshold range.
Setting thresholds
Threshold value OFF ↔ speed 1
Control value ≥ Threshold value → Fan speed = 1
Control value < Threshold value → Fan turns off
Threshold value speed 1 ↔ speed 2
Control value ≥ Threshold value → Fan speed = 2
Control value < Threshold value → Fan speed = 1
Threshold value speed 2 ↔ speed 3
Control value ≥ Threshold value → Fan speed = 3
Control value < Threshold value → Fan speed = 2
Hysteresis threshold value
It is practical to set hysteresis around the threshold value. This prevents a continuous switching between the fan speed levels.
However, if you do not want to use this function, set the hysteresis to "0". The fan then switches when the threshold value is reached.
Example
|
Parameter |
Setting |
|---|---|
|
Hysteresis threshold value |
+/–10 |
|
Threshold value |
50 |
|
Upper threshold |
50 + 10 = 60 |
|
Lower threshold |
50 – 10 = 40 |
If the control value is between 60 and 40 → no change
Control value ≥ 60 / < 40 → change of speed / fan off