AHF 005/010
Description
■Ordering numbers, 440 - 480 V
Danfoss ordering number Typical Danfoss frequency converter seriesIAHF,N Typical Motor
Used [HP] AHF 005 AHF 010 VLT 5000 VLT 6000 HVAC VLT 8000 AQUA
19 A 10, 15 175G6612 175G6634 5011, 5016 6011, 6016 8011, 8016
26 A 20 175G6613 175G6635 5022 6022 8022
35 A 25, 30 175G6614 175G6636 5027, 5032 6027, 6032 8027
43 A 40 175G6615 175G6637 5042 6042 8032
72 A 50, 60 175G6616 175G6638 5052, 5062 6052, 6062 8042, 8052
101 A 75 175G6617 175G6639 5072 6072 8062, 8072
144 A 100, 125 175G6618 175G6640 5102, 5125 6102, 6122 8102, 8122
180 A 150 175G6619 175G6641 5150 6150 8150
217 A 200 175G6620 175G6642 5200 6175 8200
289 A 250 175G6621 175G6643 5250 6225 8250
Higher ratings can be achieved by paralleling the filter units
324 A 300 144 A and 180 A units 5300 6275 8300
397 A 350 180 A and 217 A units 5350 6350 8350
506 A 450 217 A and 289 A units 5450 6400 8450
578 A 500 Two 289 A units 5500 6500 8500
* Please note that the matching of the typical Danfoss frequency converter and filter is pre-calculated based
on 480V and assuming typical motor load. VLT 5000 series is based on a 160 % torque application, while
VLT 6000 and 8000 series are based on 110% torque application.
The pre-calculated filter current may be varying from the input current ratings of VLT 5000, VLT 6000 and
VLT 8000 series as stated in the respective operating instructions, as these numbers are based on different
operating conditions.
■Calculation of the exact filter size needed
For optimal performance the harmonic filter should
be sized for the line input current to the frequency
converter, i.e. the input current drawn based on the
expected load of the frequency converter and not
the size of the frequency converter itself!
The line input current to the frequency converter
(IFC,L) can by calculated using the nominal motor
current (IM,N)anddisplacement power factor (Cos
φ)) of the motor. Both data are normally printed
on the nameplate of the motor. In the case where
the nominal motor voltage (U M,N) is unequal to the
actual line-line voltage (UL) the calculated current
must be corrected with the ratio between these
voltages as shown in the equation below.
The harmonic filter chosen must have a nominal
current (IAHF,N ) equal to or larger than the calculated
frequency converter line input current (IFC,L).
If several frequency converters are to be connected
to the same filter, the harmonic filter must be sized
according to the sum of the calculated line currents.
If the harmonic filter is sized for the load, and
the motor of the corresponding frequency
converter is changed, the current must be
re-calculated to avoid overload of the harmonic filter.
MG.80.B2.02 - VLT is a registered Danfoss trademark 5
