The Macro "SPB_AirFlowControl" is a control module providing duct air flow filtering and control as an input for the variable fan speed control module. The module has integrated features for plant overrides.


The" SPB_AirFlowControl" module provides filtering of the duct air flow and an analogue output for the variable fan speed control module. The duct air flow is filtered to provide a smoothed value, which is used to eliminate sudden duct air flow variations and thus provides a more stable operation of the duct air flow control.


The module has analogue inputs for a duct air flow sensor, a duct differential pressure sensor, a damper control signal and a digital input for the fan enable signal. It has an analogue output for fan speed command.


The module incorporates plant mode overrides and program initialise from the power failure module.