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Table 20 specifies the k-factor used by the inverter according to the pipeline diameter when using sensor
F3.00.
Table of correspondence of diameters and k-factors for flow sensor F3.00
Pipe diameter
[inch]
1/2
3/4
1
1 1/4
1 1/2
2
2 1/2
3
3 1/2
4
5
6
8
10
12
14
16
18
20
24
Table 22: Diameter of pipelines, FK conversion factor, minimum and maximum admissible flow
CAUTION: always refer to the manufacturer's installation notes and compatibility of electric parameters of the
flow sensor and those of the inverter, as well as exact correspondence of connections. Incorrect settings will
cause false flow readings with possible undesired shutdown or continuous operation without stops.
6.5.12 FZ: Setting zero flow frequency
It expresses the frequency below which it may be considered that there is zero flow in the system.
It can be set only if FI has been set to operate without a flow sensor. If FI has been set to operate with a flow
sensor, the parameter FZ is blocked. The parameter disabled message is indicated by an icon showing a
padlock.
If FZ = 0 Hz is set the inverter will use the self-adaptive operating mode, instead if FZ ≠ 0 Hz is set then the
inverter will use the minimum frequency operating mode (see par. 6.5.9.1).
6.5.13 FT: Shutdown threshold setting
This sets a minimum flow threshold, below which, if there is pressure, the inverter stops the electric pump.
This parameter is used in both operation with and without flow sensor, but the two parameters are different;
therefore even when the setting of FI is changed, the FT value remains consistent with the type of operating
mode without overwriting the two values. In operation with the flow sensor, the FT parameter is in litres/minute
or gal/min, while without the flow sensor the value is adimensional.
In the same page, as well as the flow shutdown setting FT, the measured flow rate is displayed, to facilitate
user operations. This appears in a highlighted box below the name of the FT parameter, and bears the text
"fl". In operating mode without flow sensor, the minimum flow "fl" displayed in the box is not immediately
available, and may take a few minutes of operation for the figure to be calculated.
CAUTION: if an excessively high FT value is set, undesired shutdown may occur; if the value is too low
operation may be continuous without stops.
Internal DN pipe
diameter [mm]
15
20
25
32
40
50
65
80
90
100
125
150
200
250
300
350
400
450
500
600
ENGLISH
Minimum flow l/min
K-factor
225,0
142,0
90,0
60,7
42,5
24,4
15,8
11,0
8,0
6,1
4,0
2,60
1,45
0,89
0,60
0,43
0,32
0,25
0,20
0,14
112
Maximum flow
1,6
2,8
4,4
7,2
11,3
17,7
29,8
45,2
57,2
70,7
110,4
159,0
282,6
441,6
635,9
865,5
1130,4
1430,7
1766,3
2543,4
l/min
85
151
236
386
603
942
1592
2412
3052
3768
5888
8478
15072
23550
33912
46158
60288
76302
94200
135648
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