ABB i-bus FCC/S 1 1 Series Product Manual page 272

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ABB i-bus KNX
Parameters
7.10.1.3.4.1 Example: Three-speed fan, fan control with hysteresis
Fig. 49: Fan control with hysteresis
Using hysteresis avoids continual switching between the fan speeds caused by fluctuating input
signals around the threshold value.
FCC/S 1.X.X.1 | 2CDC 508 200 D0211 Rev A 272