Danfoss VLT AQUA Drive FC 202, Design Manual, Page: 59 / 218

By connecting the AHF 005 or AHF 010 in front of a Danfoss VLT® drive, the total harmonic current distortion generated back to the
mains is reduced to 5% (AHF 005) and 10% (AHF 010).
For order numbers and more information on harmonic mitigation, refer to
10.17 Harmonics Overview , 13.2.11 Ordering of Harmonic
Filters , and for more detailed information the VLT® Advanced Harmonic Filters AHF 005/AHF 010 Design Guide .
7.7.2 VLT® Sine-wave Filters
Table 18: VLT® Sine-wave Filters
Option name FC 102 FC 103 FC 202 FC 301 FC 302
VLT
®
Sine-wave Filter MCC 101 x x x x x
When a drive controls a motor, resonance noise is heard from the motor. This noise, which is the result of the motor design, occurs
every time an inverter switch in the drive is activated. The frequency of the resonance noise thus corresponds to the switching fre-
quency of the drive.
Danfoss supplies 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
PEAK
), and the ripple current (ΔI) to the motor, which means that current and voltage become almost sinusoidal. The
acoustic motor noise is reduced to a minimum.
The ripple current in the sine-wave filter coils also causes some noise. Solve the problem by integrating the filter in a cabinet or
enclosure.
For order numbers and more information on how to dimension sine-wave filters, refer to
13.2.12 Order Numbers for VLT® Sine-wave
Filters MCC 101 , and for more detailed information the VLT® FC Series Output Filter Design Guide .
7.7.3 VLT® dU/dt Filters
Table 19: VLT® dU/dt Filters
Option name FC 102 FC 103 FC 202 FC 301 FC 302
VLT
®
Sine-wave Filter MCC 102 x x x x x
Danfoss supplies dU/dt filters. dU/dt filters are differential mode, low-pass filters that reduce motor terminal phase-to-phase peak
voltages and reduce the rise time to a level that lowers the stress on the insulation at the motor windings. This is especially an issue
with short motor cables.
Compared to the sine-wave filters, the dU/dt filters have a cut-off frequency above the switching frequency.
For order numbers and more information on how to dimension dU/dt filters, refer to
10.14 dU/dt Conditions , 13.2.13 Order Numbers
for VLT® dU/dt Filters MCC 102 , and for more detailed information the VLT® FC Series Output Filter Design Guide .
7.7.4 VLT® Common-mode Filters
Table 20: VLT® Common Mode Filters
Option name FC 102 FC 103 FC 202 FC 301 FC 302
VLT
®
Common Mode Filter MCC 105 x x x x x
High-frequency common-mode cores (HF-CM cores) reduce electromagnetic interference and eliminate bearing damage by electri-
cal discharge. They are special nanocrystalline magnetic cores that have superior filtering performance compared to regular ferrite
cores. The HF-CM core acts like a common-mode inductor between phases and ground.
Installed around the 3 motor phases (U, V, W), the common-mode filters reduce high-frequency common-mode currents. As a result,
high-frequency electromagnetic interference from the motor cable is reduced.
For ordering numbers, refer to the
VLT® FC Series Output Filter Design Guide .
7.7.5 VLT® Brake Resistors
Table 21: VLT
®
Brake Resistors
Option name FC 102 FC 103 FC 202 FC 301 FC 302
VLT
®
Brake Resistor MCE 101 x – x x x
AJ300847815559en-000101 / 130R0337 | 59 Danfoss A/S © 2020.09
Options and Accessories Overview
VLT® AQUA Drive FC 202
Design Guide