AHF 005/010
Description
■
Ordering numbers, 440 - 480 V
Danfoss ordering number
Typical Danfoss frequency converter series
I
AHF,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
(I
FC,L
) can by calculated using the nominal motor
current (I
M,N
) and displacement 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 (U
L
) 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 (I
AHF,N
) equal to or larger than the calculated
frequency converter line input current (I
FC,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
