A-10
CDD3000-HF Operation Manual
A.4 Change in
system load
through use of a
line choke
System load
1) THD = Total Harmonic Distortion (U
5
...U
41
)
Mains voltage asymmetry
Recommended:
The example shows that the benefits of a line choke with 4 % short-circuit
voltage are multi-faceted. We therefore recommend that you use a line
choke as a matter of course.
Without line
choke
With line choke Change
7.3 kVA drive
controller, mains
impedance 0.6 mH
7.3 kVA drive
controller, mains
impedance 6 mH
Without line
choke compared
to with line choke
Voltage distortion (THD)
1)
99 % 33 % -67 %
Mains current amplitude 18.9 A 9.7 A -48 %
Mains current effective 8.5 A 6.23 A -27 %
Commutation notches
referred to the mains
voltage
28 V 8 V -70%
Life of the DC-link
capacitors
Nominal life
2 to 3 times
nominal life
+100 to 200 %
Change in system load through use of a line choke with 4 % short circuit
voltage based on the example of a 7.3 kVA drive controller CDD34.010-HF
operating in the part load range
Without line choke With line choke
7.3 kVA drive controller,
mains impedance 0.6 mH
7.3 kVA drive controller,
mains impedance 6 mH
Asymmetry of mains
voltage
0 % +3 % -3 % 0 % +3 % -3 %
Mains current amplitude 18.9 A 25.4 A 25.1 A 9.7 A 10.7 A 11 A
Mains current effective 8.5 A 10.5 A 10.2 A 6.2 A 6.7 A 6.8 A
Effect of line choke with asymmetric mains voltage based on the example of a
7.3 kVA drive controller CDD34.010-HF operating in the part load range
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