Danfoss VLT FCD 311 Design Manual page 84

this may help to minimise possible acoustic noise
from the motor.
NB!:
The output frequency of the frequency con-
verter can never assume a value higher than
1/10 of the switching frequency.
Description of choice:
When the motor is running, the switching frequency
is adjusted in parameter 411 Switching frequency
until the frequency has been obtained at which the
motor is as low-noise as possible.
NB!:
The switching frequency is reduced
automatically as a function of the load. See
Temperature-Dependent Switching Frequency under
Special Conditions.
413 Overmodulation function
413
(OVERMODULATION)
Value:
Off (OFF)
On (ON)
Function:
This parameter allows connection of the overmodu-
lation function for the output voltage.
Description of choice:
Off [0] means that there is no overmodulation of the
output voltage, which means that torque ripple on
the motor shaft is avoided. This can be a good fea-
ture, e.g. on grinding machines.
On [1] means that an output voltage can be obtained
which is greater than the mains voltage (up to 5 %).
414 Minimum feedback, FB
414
(MIN. FEEDBACK)
Value:
-100,000.000 - par. 415 FB
Function:
Parameter 414 Minimum feedback, FB
Maximum feedback, FB
MAX
display text to make it show the feedback signal in a
process unit proportionally to the signal on the input.
= factory setting. () = display text [] = value for use in communication via serial communication port
84
[0]
[1]
MIN
0.000
MAX
and 415
MIN
are used to scale the
®
VLT FCD Series
Description of choice:
Set the value to be shown on the display as the min-
imum feedback signal value on the selected
feedback input (parameters 308/314 Analog inputs).
415 Maximum feedback, FB
415
(MAX. FEEDBACK)
Value:
FB - 100,000.000
MIN
Function:
See description of parameter 414 Minimum feed-
back, FB .
MIN
Description of choice:
Set the value to be shown on the display when the
maximum feedback has been obtained on the se-
lected feedback input (parameter 308/314 Analogue
inputs).
416 Process units
416
(REF/FEEDB. UNIT)
Value:
No unit ( NO UNIT)
% (%)
ppm (PPM)
rpm (RPM)
bar (BAR)
Cycles/min (CYCLE/MI)
Pulses/s (PULSE/S)
Units/s (UNITS/S)
Units/min. (UNITS/MI)
Units/h (UNITS/H)
 
C ( C)
Pa (PA)
l/s (L/S)
3 3
m /s (M /S)
l/min. (L/M)
3 3
m /min. (M /MIN)
l/h (L/H)
3 3
m /h (M /H)
Kg/s (KG/S)
Kg/min. (KG/MIN)
Kg/hour (KG/H)
Tons/min. (T/MIN)
Tons/hour (T/H)
Metres (M)
Nm (NM)
m/s (M/S)
m/min. (M/MIN)
 
F ( F)
In wg (IN WG)
gal/s (GAL/S)
3 3
Ft /s (FT /S)
MG.04.A1.02 - VLT is a registered Danfoss trade mark
MAX
1500.000
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