Delta VFD-ED Series, User Manual

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06 Optional Accessories | VFD-ED
6-9
Installing a DC reactor
THD (Total Harmonic Distortion)
The table below shows the THDi specification when using Delta's 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
Reactors in
Series Spec.
3% Input
AC Reactor
5% Input
AC Reactor
4%
DC Reactor
3% Input
AC Reactor
5% Input
AC Reactor
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 THDi may vary due to different installation conditions and environment (wires, motors).
THDi Specification
Note: For three-phase power models, Delta provides 4% DC reactors and 3% AC reactors. Refer to the following
sections to select your applicable reactors.