YASKAWA LA500, Technical Manual

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3.11 Improve the Power Factor
70 YASKAWA SIEPYEULA5001C LA500 Technical Manual
3.11 Improve the Power Factor
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Connect an AC Reactor or a DC Reactor
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Overview
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.
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Connect an AC Reactor
A - Power Supply
B - MCCB C - AC reactor
D - Drive
Figure 3.33 AC Reactor Connection Example
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Connect a DC Reactor
When you install a DC reactor, remove the jumper between ter1 and +2. If you will not use a DC reactor,
do not remove the jumper. Refer to
Figure 3.34 for an example of how to wire the DC reactor.
A - Power Supply
B - MCCB C - Drive
D - DC reactor
Figure 3.34 DC Reactor Connection Example
Note:
You cannot connect a DC reactor to drive models B001 to B018.
For single-phase drives, an AC reactor has the same effect as a DC reactor. To improve the power factor on single-phase drives, install
an AC reactor on the drive input side.