ABB ACQ580 - Page 274

270 Parameters
80.13 Flow feedback
function
Selects a function between the flow feedback sources
selected by parameters 80.11 Flow feedback 1 source and
80.12 Flow feedback 2 source.
The result of the function (for any selection) is multiplied by
parameter 80.14 Flow feedback multiplier.
In1
In1 Use 80.11 Flow feedback 1 source directly as the flow value. 0
In2 Use 80.12 Flow feedback 2 source directly as the flow value. 1
Reserved 2…7
sqrt(In1) Flow is calculated as a square root of a differential pressure
measurement:
The differential pressure value is selected with 80.11 Flow
feedback 1 source.
8
sqrt(In1-In2) Flow is calculated as a square root of two measured absolute
pressure measurements:
The pressure measurement sources are selected with 80.11
Flow feedback 1 source and 80.12 Flow feedback 2 source.
9
HQ curve The HQ curve is used for flow calculation.
You can configure pressure sensor settings with parameter
group 81 Sensor settings.
The figure below shows the HQ performance curve of the
pump for the flow calculation function.
100
No. Name/Value Description Def/FbEq16
k ΔP
kP
1
P
2
–()
H [m] or H [ft]
Q [m
3
/h] or
Q [gpm]
4
2
1
3
5