Danfoss VLT 8000 AQUA series Operating Instructions Manual page 23

Harmonic filter
Harmonic currents do not directly affect the electricity
consumption but has an impact on following conditions:
Higher total current to be handled by the installations
- Increases load on transformer (sometimes it will
require a larger transformer, particular at retrofit)
- Increases heat losses in transformer and installation
- In some cases demands larger cables,
switches and fuses
Higher voltage distortion due to higher current
- Increase risk for disturbing electronic equipment
connected to same grid
A high percentage of rectifier load from eg frequency
converters, will increase the harmonic current, which
must be reduced to avoid the above consequences.
Therefore the frequency converter has as standard,
built in DC coils reducing the total current with about
40% (compared to devices without any arrangement
for harmonic suppression), down to 40-45% ThiD.
Ordering numbers, Harmonic filters
Harmonic filters are used to reduce mains harmonics
• AHF 010: 10% current distortion
• AHF 005: 5% current distortion
380-415 V, 50 Hz
I Typical Motor Used
AHF,N
[kW]
10 A
19 A
26 A
35 A
43 A
72 A
101 A
144 A
180 A
217 A
289 A
324 A
370 A
Higher ratings can be achieved by paralleling the filter units
434 A
578 A
613 A
648 A
740 A
MG.83.A2.02 - VLT is a registered Danfoss trademark
Danfoss ordering number
AHF 005
4, 5.5 175G6600
7.5 175G6601
11 175G6602
15, 18.5 175G6603
22 175G6604
30, 37 175G6605
45. 55 175G6606
75 175G6607
90 175G6608
110 175G6609
132, 160 175G6610
175G6611
200 175G6688
250
315
355
400
450
®
VLT
In some cases there is a need for further suppression
(eg retrofit with frequency converters). For this purpose
Danfoss can offer two advanced harmonic filters
AHF05 and AHF10, bringing the harmonic current
down to around 5% and 10% respectively. For further
details see instruction MG.80.BX.YY.
MCT 31
The MCT 31 harmonic calculation PC tool enables
easy estimation of the harmonic distortion in a given
application. Both the harmonic distortion of Danfoss
frequency converters as well as non-Danfoss frequency
converters with different additional harmonic reduction
measurements, such as Danfoss AHF filters and
12-18-pulse rectifiers, can be calculated.
Ordering number:
Please order your CD containing the MCT 31 PC
tool using code number 130B1031.
AHF 010
175G6622
175G6623
175G6624
175G6625
175G6626
175G6627
175G6628
175G6629
175G6630
175G6631
175G6632
175G6633
175G6691
Two 217 A units
Two 289 A units
289 A and 324 A units
Two 324 A units
Two 370 A units
8000 AQUA
VLT 8000
8006, 8008
8011, 8016
8022
8027
8032
8042, 8052
8062, 8072
8102
8122
8152
8202, 8252
8302
8352
8452
8502
8602
8652
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