2.20 Improve the Power Factor
128 YASKAWA SIEPC71061723A YASKAWA AC Drive CR700 Technical Manual
2.20 Improve the Power Factor
◆ Connect an AC Reactor or a DC Reactor
AC reactors and DC reactors decrease surges in current and improve the power factor on the input side of the
drive.
Connect an AC reactor or a DC reactor to the input side (primary side) in the these conditions:
• To decrease harmonic current or improve the power factor of the power supply
• When there is switching of phase advancing capacitor
• With a large capacity power supply transformer (600 kVA or more).
Note:
• You can use an AC reactor and DC reactor together.
• When you connect a thyristor converter (for example, a DC drive) to the same power supply system, use an AC reactor.
• The main circuit terminal block for the drive and the terminal blocks for the AC and DC reactors come in different shapes. Correctly
prepare the ends of the wiring.
• Ground the AC and DC reactors (option) on the back of the mounting base. Remove all paint from the mounting surface of the control
panel.
■ Connect an AC Reactor
A - Power Supply
B - MCCB
C - AC reactor
D - Drive
Figure 2.144 AC Reactor Connection Example
■ Connect a DC Reactor
When you install a DC link choke, remove the jumper between terminals +1 and +2. If you will not use a DC link
choke, do not remove the jumper. Refer to
Figure 2.145 for an example of how to wire the DC reactor.
A - Power supply
B - MCCB
C - Drive
D - DC reactor
Figure 2.145 DC Reactor Connection Example
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