Sine-Wave Filters - Danfoss VLT AutomationDrive FC 300 Design Manual

FC 300 Design Guide
A – Top cover
B – Brim
C – Base part
D – Base cover
E – Screw(s)
Place the top cover as shown. If an A or B option
is used the brim must be fitted to cover the top
inlet. Place the base part C at the bottom of the
drive and use the clamps from the accessory
bag to correctly fasten the cables. Holes for ca-
ble glands:
Size A2: 2x M25 and 3xM32
Size A3: 3xM25 and 3xM32

8.11. Sine-wave Filters

When a motor is controlled by a frequency converter, resonance noise will be heard from the motor. This noise, which is the result of the design of the
motor, arises every time an inverter switch in the frequency converter is activated. The frequency of the resonance noise thus corresponds to the switching
frequency of the frequency converter.
For the FC 300 Series, Danfoss can supply a Sine-wave filter to dampen the acoustic motor noise.
The filter reduces the ramp-up time of the voltage, the peak load voltage U
voltage become almost sinusoidal. Consequently, the acoustic motor noise is reduced to a minimum.
The ripple current in the Sine-wave Filter coils, will also cause some noise. Solve the problem by integrating the filter in a cabinet or similar.
and the ripple current ΔI to the motor, which means that current and
PEAK
MG.33.BA.02 - VLT ® is a registered Danfoss trademark
8. Options and Accessories
8
163