Harmonic filter
Harmonic currents do not directly affect the electricity
consumption but has an impact on following condi-
tions:
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 in-
stallation
-
In some cases demands larger cables,
switches and fuses
Higher voltage distortion due to higher current
-
Increase risk for disturbing electronic equip-
ment 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 pur-
pose 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.
Ordering numbers, Harmonic filters
Harmonic filters are used to reduce mains harmonics
• AHF 010: 10% current distortion
• AHF 005: 5% current distortion
380-415V, 50Hz
I
AHF,N
Typical Motor Used
[kW]
Danfoss ordering number VLT 6000
AHF 005 AHF 010
10 A 4, 5.5 175G6600 175G6622 6006, 6008
19 A 7.5 175G6601 175G6623 6011
26 A 11 175G6602 175G6624 6016
35 A 15, 18.5 175G6603 175G6625 6022, 6027
43 A 22 175G6604 175G6626 6032
72 A 30, 37 175G6605 175G6627 6042, 6052
101 A 45. 55 175G6606 175G6628 6062, 6072
144 A 75 175G6607 175G6629 6102
180 A 90 175G6608 175G6630 6122
217 A 110 175G6609 175G6631 6152
289 A 132, 160 175G6610 175G6632 6172, 6222
324 A 175G6611 175G6633
370 A 200 175G6688 175G6691 6272
Higher ratings can be achieved by paralleling the filter units
434 A
250 Two 217 A units 6352
578 A 315 Two 289 A units 6402
613 A 355 289 A and 324 A units 6502
648 A 400 Two 324 A units 6552
648 A 450 Two 324 A units 6602
VLT
®
6000 HVAC Series
MG.61.B5.02 - VLT
®
is a registered Danfoss trademark 41
Introduction to HVAC
To Next Page
Loading...
Need help?
General