Danfoss VLT 2800 Design Manual page 95

Programming
NOTICE
The switching frequency is reduced automatically as a
function of the load. See Temperature-Dependent
Switching Frequency under Special Conditions.
When LC-filter connected is selected in parameter 412
Variable switching frequency, the minimum switching
frequency is 4.5 kHz.
412 Variable switching frequency
Value:
Without LC-filter (WITHOUT LC-FILTER)
LC-filter connected
(LC-filter connected)
Function:
Set the parameter to [3] LC-filter connected if an LC-filter is
connected between the adjustable frequency drive and the
motor.
Description of choice:
Select [3] LC-filter connected if an LC-filter is connected
between the adjustable frequency drive and the motor, as
otherwise the adjustable frequency drive cannot protect
the LC-filter.
NOTICE
When the LC filter is selected, the switching frequency is
changed to 4.5 kHz.
413 Overmodulation function
Value:
Off (off)
On (on)
Function:
This parameter allows connection of the overmodulation
function for the output voltage.
Description of choice:
[0] Off 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 feature, e.g. on
grinding machines.
[1] On means that an output voltage can be obtained
which is greater than the mains voltage (up to 5 %).
414 Minimum feedback FB
Value:
-100,000.000 - par. 415 FB
MAX
Function:
Parameters 414 Minimum feedback, FB
feedback, FB are used to scale the display text to make
MAX
it show the feedback signal in a process unit proportionally
to the signal on the input.
Description of choice:
Set the value to be shown in the display as the minimum
feedback signal value on the selected feedback input
MG27E402
Design Guide
[2]
[3]
[0]
[1]
MIN
0.000
and 415 Maximum
MIN
Danfoss A/S © Rev. May/2014 All rights reserved.
(parameters 308 Terminal 53, analog input voltage/314
Terminal 60, analogue input current).
415 Maximum feedback, FB
Value:
FB - 100,000.000
MIN
Function:
See description of parameter 414 Minimum feedback, FB
Description of choice:
Set the value to be shown in the display when the
maximum feedback has been obtained on the selected
feedback input (parameters 308 Terminal 53, analog input
voltage/314 Terminal 60, analogue input current).
416 Process units
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
m /s (m3/s)
l/min. (l/m)
3
m /min. (m3/min)
l/h (l/h)
3
m /h (m3/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
Ft /s (ft3/s)
Gal/min. (gal/min)
3
Ft /min. (Ft3/min)
Gal/h (gal/h)
3
Ft /h (Ft3/h)
MAX
1500.000
.
4
MIN
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