Operation Mode Indirect Volume Flow Control,
parameter Operation Mode 440 = 5
This operation mode is suitable for volume flow control based on pressure measurement.
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.
Adjustment to the application and measurement is done via Ind. Volume Flow Control Factor 446.
The actual values are calculated from the system data to be parameterized, reference pressure and
volume flow, according to the bad point method, as described in chapter 20.4.2 "20.4.2".
The output frequency is limited by Minimum Frequency 418 and Maximum Frequency 419.
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