VLT
®
4000 VT
416 Feedback conversion
(FEEDBACK CONV)
Value:
✭
Linear (LINEAR)
[0]
Square root (SQUARE ROOT)
[1]
Function:
In this parameter, a function is selected which
converts a connected feedback signal from the
process to a feedback value that equals the square
root of the connected signal.
This is used, e.g. where regulation of a flow (volume)
is required on the basis of pressure as feedback signal
(flow = constant x
√
pressure). This conversion makes it
possible to set the reference in such a way that there
is a linear connection between the reference and the
flow required. See drawing in next column.
Feedback conversion should not be used if
2-zone regulation in parameter 417
Feedback
function
has been selected.
Description of choice:
If
Linear
[0] is selected, the feedback signal and the
feedback value will be proportional. If
Square root
[1] is selected, the VLT AFD translates the feedback
signal to a squared feedback value.
417 Feedback function
(2 FEEDBACK, CALC.)
Value:
Minimum (MINIMUM)
[0]
✭
Maximum (MAXIMUM)
[1]
Sum (SUM)
[2]
Difference (DIFFERENCE)
[3]
Average (AVERAGE)
[4]
2-zone minimum (2 ZONE MIN)
[5]
2-zone maximum (2 ZONE MAX)
[6]
Function:
This parameter allows a choice between
different calculation methods whenever two
feedback signals are used.
MG.40.A7.22 - VLT is a registered Danfoss trademark
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