Technical data
452 Controller range
(pid contr. range)
Value:
0 - 200 %
10 %
Function:
This parameter is only active if in parameter 100 Con-
figuration the selection made is Speed regulation,
closed loop.
The controller range (bandwidth) limits the output from
the PID controller as a % of motor frequency f
M,N
.
Description of choice:
The required % value can be selected for motor fre-
quency f
M,N
. If the controller range is reduced the
speed variations will be less during initial tuning.
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.
457 Phase loss function
(PHASE LOSS FUNCT)
Value:
Trip (TRIP) [0]
Autoderate & warning (AUTODERATE &
WARNING) [1]
Warning (WARNING) [2]
Function:
Select the function which is to be activated if the mains
imbalance becomes too high or if a phase is missing.
Description of choice:
At Trip [0] the frequency converter will stop the motor
within a few seconds (depending on drive size).
If Autoderate & warning [1] is selected, the drive will
export a warning and reduce the output current to 50
% of I
VLT,N
to maintain operation.
At Warning [2] only a warning will be exported when a
mains failure occurs, but in severe cases, other ex-
treme conditions might result in a trip.
NB!
If Warning has been selected, the life ex-
pectancy of the drive will be reduced when
the mains failure persists.
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.
VLT
®
2800 Series
= factory setting, () = display text, [] = value for use in communication via serial communication port
108 MG.27.E3.02 - VLT
®
is a registered Danfoss trademark