Danfoss VLT 2800 Series General Information

Function:
This parameter is only active if in parameter 100 Con-
figuration the selection made is Speed regulation,
closed loop. The FF function sends a larger or smaller
part of the reference signal outside the PID controller
in such a way that the PID controller only has an influ-
ence on part of the control signal. Any change to the
set point will thus have a direct effect on the motor
speed. The FF factor provides high dynamism when
changing the set point and less overswing.
Description of choice:
The required % value can be selected in the interval f
MIN
- f
MAX
. Values over 100 % are used if the set point
variations are only small.
452 Controller range
(pid contr. range)
Value:
0 - 200 %
10 %
Function:
This parameter is only active if Speed regulation,
closed-loop is made in parameter 100 Configuration.
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:
This 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 Out of frequency range occurs.
456 Brake Voltage Reduce
(BRAKE VOL REDUCE)
Value:
0 - 25 V if 200 V device
0
0 - 50 V if 400 V 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 adjustable frequency drive 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.
VLT
®
2800 Series
= factory setting, () = display text, [] = value for use in communication via serial communication port
MG.27.A2.22 - VLT
®
is a registered Danfoss trademark 77
Programming

Danfoss VLT 2800 Series Specifications

General

Brand	Danfoss
Model	VLT 2800 Series
Category	DC Drives
Language	English