Danfoss VLT 2800 Series, Руководство по эксплуатации

Страница: 53 / 103

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.
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.
NB!
Parameter groups 500 Serial communica-
tion and 600 Service functions are not
included in this manual. Please contact
Danfoss and ask for the VLT 2800 Design
Guide.
VLT
®
2800 Series
= factory setting, () = display text, [] = value for use in communication via serial communication port
52 MG.27.A2.02 - VLT
®
is a registered Danfoss trademark