BONFIGLIOLI ACTIVE Cube ACU 201-01 Operating Instructions Manual page 224

Operation mode indirect volume flow control,
parameter 440 = 5
Operation mode
This operation mode is suitable for volume flow control based on pressure measure-
ment.
The square rooted actual value enables, for example, direct measurement of the
active pressure in the system via the intake nozzle of the fan. The active pressure
has a square proportion to the volume flow and thus forms the control figure for the
volume flow control. The calculation corresponds to the "Law of Proportionality"
which is generally valid for centrifugal machines.
Adaptation to the application in question and measurement are done via the
Ind. vol-
446. The actual values are calculated from the system data
ume flow control factor
to be parameterized, reference pressure and volume flow, according to the bad point
method, as described in chapter "Volume Flow and Pressure".
418 and
The output frequency is limited by the
Minimum frequency Maximum fre-
419.
quency
Operating Instructions ACU
224 06/13