Electrical Installation
3
3.12 Improve the Power Factor
YASKAWA SIEPC71061737D GA800 Drive Technical Reference 143
3.12 Improve the Power Factor
◆ Connect an AC Reactor or a DC Link Choke
AC reactors and DC link chokes decrease surges in current and improve the power factor on the input side of the
drive.
Connect an AC reactor or a DC link choke 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 link choke 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 reactor and DC Link Choke come in different shapes. The
drive has a European-style terminal block, and the AC reactor and DC Link Choke have a circular terminal block. Correctly prepare the
ends of the wiring.
• Ground the AC reactor and DC Link Choke (option) on the back of the mounting base. Remove all paint from the mounting surface of the
control panel.
■ 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 3.89 AC Reactor Connection Example
■ Connect a DC Link Choke
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 3.90 for an example of how to wire the DC link choke.
A - Power supply
B - MCCB
C - Drive
D - DC link choke
Figure 3.90 DC Link Choke Connection Example
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