Technical Specifications 9-11
650V AC Drive
Supply Harmonic Analysis (400V unfiltered)
Assumptions: (Short circuit fault to Neutral)
5kA short circuit supply capability at 230V 1φ, equivalent to 146μH supply impedance
7.5kA short circuit supply capability at 230V 3φ, equivalent to 56μH supply impedance
10kA short circuit supply capability at 400V 3φ, equivalent to 73μH supply impedance
THD
Q
h
2
1n
h40
=
h2
%
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 650V
Motor Power (kW)
0.37 0.55 0.75 1.1 1.5 2.2 3.0 4.0 5.5 7.5
Fundamental Voltage (V)
400 400 400 400 400 400 400 400 400 400
Typical Motor Efficiency %
85 85 85 85 85 85 85 85 85 85
Harmonic No. RMS Current (A)
1
0.6 0.9 1.3 1.9 2.6 3.8 5.2 6.9 9.5 12.7
3
0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
5
0.6 0.9 1.2 1.8 2.4 3.6 4.7 6.3 8.4 11.0
7
0.6 0.9 1.2 1.7 2.3 3.3 4.3 5.7 7.4 9.5
9
0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
11
0.5 0.8 1.0 1.5 1.9 2.6 3.3 4.2 4.9 5.8
13
0.5 0.7 0.9 1.3 1.6 2.2 2.7 3.4 3.7 4.0
15
0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
17
0.4 0.6 0.7 0.9 1.2 1.5 1.6 1.9 1.5 1.3
19
0.4 0.5 0.6 0.8 0.9 1.1 1.1 1.3 0.8 0.7
21
0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
23
0.3 0.4 0.4 0.5 0.5 0.5 0.4 0.4 0.5 0.7
25
0.2 0.3 0.3 0.3 0.4 0.3 0.2 0.3 0.5 0.7
27
0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
29
0.1 0.2 0.2 0.2 0.1 0.2 0.2 0.3 0.4 0.4
31
0.1 0.1 0.1 0.1 0.1 0.2 0.3 0.3 0.3 0.3
33
0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
35
0.1 0.1 0.1 0.1 0.1 0.2 0.2 0.2 0.2 0.3
37
0.0 0.1 0.1 0.1 0.1 0.2 0.2 0.1 0.2 0.2
39
0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
40
0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
Total RMS Current (A) 1.5 2.1 2.8 4.0 5.1 7.4 9.5 12.4 16.0 20.6
THD (V) % 0.1634 0.2209 0.2817
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