9-8
Technical Specifications
650V AC Drive
Supply Harmonic Analysis (230V filtered)
Assumptions:
(Short circuit fault to Neutral)
5kA short circuit supply capability at 230V 1
, equivalent to 146
H supply impedance
7.5kA short circuit supply capability at 230V 3
, equivalent to 56
H supply impedance
10
kA short circuit supply capability at 400V 3
, equivalent to 73
H 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 and stage 2 of the Engineering Recommendation G.5/4 February 2001,
Classification ‘C’: Limits for Harmonics in the UK Electricity Industry
.
Drive Type
650V
Motor Power (kW)
0.25
0.37
0.55
0.75
1.1
1.5
2.2
3.0
4.0
Fundamental Voltage (V)
230
230
230
230
230
230
230
230
230
Typical Motor Efficiency %
85
85
85
85
85
85
85
85
85
Harmonic No.
RMS Current (A)
1
7.4
7.5
7.8
8.2
9.0
10.3
TBA
TBA
TBA
3
1.4
0.2
1.9
2.2
2.9
3.9
5
2.9
0.4
4.4
4.6
4.8
5.2
7
1.1
0.5
1.9
2.0
2.3
2.5
9
0.2
0.2
0.2
0.3
0.4
0.4
11
0.1
0.1
0.2
0.2
0.2
0.3
13
0.0
0.1
0.1
0.1
0.1
0.1
15
0.1
0.0
0.1
0.1
0.1
0.1
17
0.0
0.1
0.0
0.0
0.0
0.1
19
0.0
0.0
0.0
0.0
0.0
0.1
21
0.0
0.0
0.0
0.0
0.0
0.1
23
0.0
0.0
0.0
0.0
0.0
0.0
25
0.0
0.0
0.0
0.0
0.0
0.0
27
0.0
0.0
0.0
0.0
0.0
0.0
29
0.0
0.0
0.0
0.0
0.0
0.0
31
0.0
0.0
0.0
0.0
0.0
0.0
33
0.0
0.0
0.0
0.0
0.0
0.0
35
0.0
0.0
0.0
0.0
0.0
0.0
37
0.0
0.0
0.0
0.0
0.0
0.0
39
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
Total RMS Current (A)
8.2
7.5
9.3
9.9
10.9
12.5
THD (V) %
0.3559
0.0972
0.5426
0.5733
0.6277
0.7055