A – Top cover
B – Brim
C – Base part
D – Base cover
E – Screw(s)
F - Fan cover
G - Top clip
When option module A and/
or option module B is/are
used, the brim (B) must be
fitted to the top cover (A).
B3 Enclosure B4 - C3 - C4 Enclosure
3.6.16 Input Filters
Harmonic current distortion is caused by the 6-pulse diode rectifier of the variable speed drive. The harmonic currents are affecting the installed serial
equipment identical to reactive currents. Consequently harmonic current distortion can result in overheating of the supply transformer, cables etc. De-
pending on the impedance of the power grid, harmonic current distortion can lead to voltage distortion also affecting other equipment powered by the
same transformer. Voltage distortion is increasing losses, causes premature aging and worst of all erratic operation. The majority of harmonics are reduced
by the built-in DC coil but if additional reduction is needed, Danfoss offers two types of passive filters.
The Danfoss AHF 005 and AHF 010 are advanced harmonic filters, not to be compared with traditional harmonic trap filters. The Danfoss harmonic filters
have been specially designed to match the Danfoss frequency converters.
AHF 010 is reducing the harmonic currents to less than 10% and the AHF 005 is reducing harmonic currents to less than 5% at 2% background distortion
and 2% imbalance.
3.6.17 Output Filters
The high speed switching of the frequency converter produces some secondary effects, which influence the motor and the enclosed environment. These
side effects are addressed by two different filter types, -the du/dt and the Sine-wave filter.
3 VLT AQUA Selection VLT
®
AQUA Drive Design Guide
80
MG.20.N5.02 - VLT
®
is a registered Danfoss trademark
3
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