Delta C2000 Series - Page 132

Chapter 7 Optional AccessoriesC2000
7-25
Following table is the THDi value of Delta motor drive matching AC/DC reactor:
Drive Spec. Models without built-in DC reactor Models with built-in DC reactor
Reactor
Spec.
No AC/DC
reactor
3% input AC
reactor
5% input AC
reactor
4% DC reactor
No AC/DC
reactor
3% input AC
reactor
5% input AC
reactor
5th 73.3% 38.5% 30.8% 25.5% 31.16% 27.01% 25.5%
7th 52.74% 15.3% 9.4% 18.6% 23.18% 9.54% 8.75%
11th 7.28% 7.1% 6.13% 7.14% 8.6% 4.5% 4.2%
13th 0.4% 3.75% 3.15% 0.48% 7.9% 0.22% 0.17%
THDi 91% 43.6% 34.33% 38.2% 42.28% 30.5% 28.4%
Note: THDi may have some difference due to different installation conditions (like wires or motors) and environment.
Installing an AC reactor on the input side of an AC motor drive can increase line impedance, improve
the power factor, reduce input current, and reduce interference generated from the motor drive. It also
reduces momentary voltage surges or abnormal current spikes. For example, when the main power
capacity is higher than 500 kVA, or when using a switching capacitor bank, momentary voltage and current
spikes may damage the AC motor drive’s internal circuit. An AC reactor on the input side of the AC motor
drive protects it by suppressing surges.
Installation
Install an AC input reactor in series with the three output phases U V W to Motor as shown below:
Wiring of AC output reactor
AC Output reactor
Table 7-33
Figure 7-8