3.14 Decrease Noise
110 YASKAWA SIEPC71061753C GA500 Technical Manual
3.14 Decrease Noise
Note:
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.
◆ Connect a Noise Filter to the Input Side (Primary Side)
High-speed switching makes noise in the drive output. This noise flows from the drive to the power supply, and
can have an effect on other equipment. Install a noise filter to the input side of the drive to decrease the quantity of
noise that flows to the power supply. A noise filter will also stop noise from entering the drive from the power
supply.
• Use a noise filter specially designed for drives.
• Install the noise filter as close as possible to the drive.
A - Power Supply
B - Input side (primary side) noise filter
C - Drive
D - Other controller
Figure 3.60 Example of Connecting the Noise Filter on the Input Side (Primary Side)
Note:
Drive models GA50CxxxxExx have built-in input noise filters. When you use these drives, make sure that the filter specifications align
with the application and applicable regulations. Refer to European Standards on page 162 for more information.
◆ Connect a Noise Filter to the Output Side (Secondary Side)
A noise filter on the output side of the drive decreases inductive noise and radio frequency interference.
Figure 3.61 shows an example of noise filter wiring.
NOTICE: Do not connect phase-advancing capacitors, LC/RC noise filters, or leakage breakers (RCM/RCD) to the motor
circuit. If you connect these devices to the output circuits, it can cause damage to the drive and connected equipment.
A - Power supply
B - Drive
C - Noise filter on output side (secondary side)
D - Motor
Figure 3.61 Example of Connecting the Noise Filter on the Output Side (Secondary Side)
Note:
Glossary
• Radio frequency interference:
Electromagnetic waves radiated from the drive and cables make noise through the full radio bandwidth that can have an effect on
nearby devices.
• Inductive noise:
The noise from electromagnetic induction can have an effect on the signal line and can cause the controller to malfunction.
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