VLT
®
2800 Series
Programming
Function:
The user sets the voltage by which the level for
resistor braking is reduced. It is only active when
resistor in parameter 400 is selected.
Description of choice:
The greater the reduction value, the faster the
reaction to a generator overload. Should only
be used if there are problems with overvoltage
in the intermediate circuit.
461 Feedback conversion
(FEEDBAC CONV.)
Value:
✭Linear (LINEAR)
[0]
Square root (SQUARE ROOT)
[1]
Function:
In this parameter, a function is selected which converts
a connec ted 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 o f p ressure
as feedback signal (flow = constant x
).
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.
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 frequency co nverter translates the
feedback signal to a squared feedback value.
✭ = factory setting. () = di splay text [] = value for use in communication via serial communicat ion port
MG.28.E9.02 - VLT is a registered Danfoss trademark
107
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