Danfoss VLT 2800, Руководство пользователя

Страница: 105 / 166

455 Frequency range monitor
(MON. FREQ. RANGE)
Value:
Disable [0]
Enable [1]
Function:
his parameter is used if warning 33 Out of frequency
range must be turned off in the display in process con-
trol closed loop. This parameter does not affect the
extended status word.
Description of choice:
Select Enable [1] to enable the readout in the display
if warning 33 Out of frequency range occurs. Select
Disable [0] to disable the readout in the display if warn-
ing 33 ut of frequency range occurs.
456 Brake Voltage Reduce
(BRAKE VOL REDUCE)
Value:
0 - 25 V if 200V device
0
0 - 50 V if 400V device
0
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 cir-
cuit.
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 connected feedback signal from the process to a
feedback value that equals the square root of the con-
nected 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.
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 converter translates the
feedback signal to a squared feedback value.
= factory setting, () = display text, [] = value for use in communication via serial communication port
MG.27.E2.02 - VLT is a registered Danfoss trademark 105
Pr
ogr
a
mmi
ng