Improve The Power Factor; Connect An Ac Reactor Or A Dc Link Choke - YASKAWA GA80U4720ABM Manual

Table of Contents

3.12 Improve the Power Factor

AC reactors and DC link chokes decrease surges in current and improve the power factor on the input side of the

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).

• 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, 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 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.

Connect an AC Reactor

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

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

A - Power supply

C - AC reactor

Figure 3.75 AC Reactor Connection Example

for an example of how to wire the DC link choke.

D - DC link choke

Figure 3.76 DC Link Choke Connection Example

YASKAWA SIEPC71061737B GA800 Drive Technical Reference