SSD 605C Product Manual - page 192
11-8
Technical Specifications
605C Frequency Inverter
Supply Harmonic Analysis
Assumptions: 10000A short circuit supply capability, equivalent to 73
µH supply impedance
THD(V) x 100
=
=
∑ Q
Q
h2
1n
h 40
=
h 2
%
where Q
1n
is the rated rms value of the fundamental voltage of the supply transformer.
The results conform to stage 1, stage 2 and stage 3 of the Engineering Recommendation G.5/3
September 1976, Classification ‘C’: Limits for Harmonics in the UK Electricity Industry
.
Drive Type
605C
Motor Power (kW)
5.5
7.5
11
15
Fundamental Voltage (V)
415
415
415
415
Typical Motor Efficiency %
88
89
91
92
Harmonic No.
RMS Current (A)
1
10.29
11.95
17.20
22.73
5
8.65
10.06
14.05
18.37
7
7.14
8.39
11.37
14.67
11
3.90
4.66
5.59
6.89
13
2.54
2.98
3.20
3.80
17
0.65
0.88
0.94
1.31
19
0.53
0.71
1.03
1.41
23
0.54
0.70
0.78
0.92
25
0.44
0.54
0.51
0.61
29
0.23
0.32
0.43
0.55
31
0.22
0.31
0.43
0.50
35
0.20
0.28
0.29
0.30
37
0.16
0.22
0.23
0.29
Total RMS Current (A)
15.9
18.64
25.83
33.72
THD (V) %
0.87
1.16
1.51
1.84