Chapter 6 Optional Accessories | VFD-ED
Figure 6-5 Installing a DC Reactor
THD (Total Harmonic Distortion)
The table below shows the THDi specification when using Deltas drives (three-phase power models) to
work with AC/DC reactors.
Motor Drive Spec.
Models without
AC/DC Reactors
Models without Built-in DC Reactors
Models with Built-in DC
Reactors in
3% Input AC
5% Input AC
4% DC
3% Input
5% Input
5th 73.3% 38.5% 30.8% 25.5% 27.01% 25.5%
7th 52.74% 15.3% 9.4% 18.6% 9.54% 8.75%
11th 7.28% 7.1% 6.13% 7.14% 4.5% 4.2%
13th 0.4% 3.75% 3.15% 0.48% 0.22% 0.17%
THDi 91% 43.6% 34.33% 38.2% 30.5% 28.4%
NOTE:
1. THDi may vary due to different installation conditions and environment (wires, motors).
2. For three-
phase power models, Delta provides 4% DC reactors and 3% AC reactors. Refer to the
following sections to select your applicable reactors.
Table 6-7
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