Mechanical & Electrical
Installation
2
2.21 Improve the Power Factor
YASKAWA ELECTRIC SIEP C710617 05F YASKAWA AC Drive GA700 Technical Manual 125
2.21 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, you should use an AC reactor,
regardless of the conditions of the power supply.
• The main circuit terminal block for the drive, and the terminal blocks for the AC and DC reactors come in different shapes. The drive
has a European-style terminal block, and the AC and DC reactors have a circular terminal block. Use caution when you prepare the
ends of the wires.
■ Connect an AC Reactor
Note:
When you connect an AC reactor to the output side (secondary side) of the driver, set C6-02 = 1 [Carrier Frequency Selection = 2.0
kHz].
A - Power supply
B - MCCB
C - AC reactor
D - Drive
Figure 2.126 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 2.127 for an example of how to wire the DC reactor.
A - Power supply
B - MCCB
C - Drive
D - DC reactor
Figure 2.127 DC Reactor Connection Example
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