ABB ACQ580 Firmware Manual page 274

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