Air flow control

The measured value of the air is calculated using the duct pressure and the temperature


During plant modes 1 to 6, the SPB_AirFlowControl will be released as soon as the input "FanEnableSig" becomes true (=1). The setpoint for the SPB_StatPressControl is defined by one of the three setpoint as described in the chapter "Air flow setpoint", while the proportional band and integral time respectively are defined by the parameters AFL-02 and AFL-03.

The next figure shows the internal control signal of the SPB_AirFlowControl in relation to its setpoint and proportional band.


The fan speed control signal will be limited between the minimum and maximum signals as defined by the parameters FSC-02 and FSC-03.


Description

Default value

AFL-01: setpoint increase/ decrease per minute

2500 m³/h

AFL-02: P-band air flow control

1000 m³/h

AFL-03: I-time air flow control

0 sec

FSC-02: minimum fan speed signal

0 %

FSC-03: maximum fan speed signal

100 %