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
