tion stress and bearing currents. By supplying the motor with a sinusoidal voltage waveform, the switching acoustic noise from the
motor is also eliminated.
For more detailed information, see the VLT® Sine-Wave Filter MCC 101 factsheet.
However, this type of filter also produces a voltage drop and there may be a reduction in the available control bandwidth. This can
sometimes make it impossible to use this filter type. Again, as for the dU/dt filter, losses are linked to the switching frequency.
For more detailed information, see the VLT® Output Filters Design Guide.
3.4.6 Motor Cables and Motor
Motor cables
Motor cables introduce mainly ohmic losses: the longer the cables, the more resistance. In general, when correctly selected, the
losses in cables shorter than 25 m (82 ft) can be neglected. In single-wire cables with individual shielding, current causes losses in
the cable shielding. These losses can be neglected when using 3-wire cables.
Motor
There are many different types of motors that can be operated with a drive. The solution for dealing with losses in motors is there-
fore depending on the individual motor type and installation. In standard IEC 61800-9-2:2017 annex D, a discussion on motor load
and losses is found.
A method to evaluate the losses generated in the motor operated with a drive can be found in the standards IEC 60034-2-1 and IEC
TS 60034-2-4.
AJ330233902305en-000201 / 130R059626 | Danfoss A/S © 2021.05
Product Overview
VLT® Compressor Drive CDS 803
Design Guide
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