Air flow detection
The SCA_DXCoolingNordic input "FanBeltIn"shall be connected to an airflow signal from another macro, e.g. the fan differential pressure switch. The user has the option to add an own airflow switch for the SCA_DXCoolingNordic or to disable the function entering a "1" as a default value of the input. .
Attention: It is highly recommended to connect an airflow switch to avoid damages.
If an airflow switch is connected, any output stage of this step-controller can switch on only, if the SCA_DXCoolingNordic has detected airflow. If the airflow input will detect a failure during normal operation at this input, the SCA_DXCoolingNOrdic will stop immediately, without considering the blocking off times.
After "FanBeltIn" becomes true, the I-enable delay (which is equal to the adjusted I-time) will be effective, to provide only proportional control at start-up.