VLT
®
8000 AQUA
Introduction
■ 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.
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.
■ 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
Danfoss ordering numberI
AHF,N
Typical Motor Used
[kW]
AHF 005 AHF 010
VLT 8000
10 A 4, 5.5 175G6600 175G6622 8006, 8008
19 A 7.5 175G6601 175G6623 8011, 8016
26 A 11 175G6602 175G6624 8022
35 A 15, 18.5 175G6603 175G6625 8027
43 A 22 175G6604 175G6626 8032
72 A 30, 37 175G6605 175G6627 8042, 8052
101 A 45. 55 175G6606 175G6628 8062, 8072
144 A 75 175G6607 175G6629 8102
180 A 90 175G6608 175G6630 8122
217 A 110 175G6609 175G6631 8152
289 A 132, 160 175G6610 175G6632 8202, 8252
324 A 175G6611 175G6633
370 A 200 175G6688 175G6691 8302
Higher ratings can be achieved by paralleling the filter units
434 A 250 Two 217 A units 8352
578 A 315 Two 289 A units 8452
613 A 355 289 A and 324 A units 8502
648 A 400 Two 324 A units 8602
740 A 450 Two 370 A units 8652
MG.83.A2.02 - VLT is a registered Danfoss trademark
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