Reducing Noise; Connecting A Noise Filter To Input Side (Primary Side); Connecting A Noise Filter To (Secondary Side) - YASKAWA GA700 Technical Manual

2.22

Reducing Noise

Note:
The main circuit terminal block for the drive, and terminal block for the noise filter come in different shapes. The drive comes with a
European style terminal block and the noise filter comes with a round terminal block. Take due care when preparing the ends of the
wires.
◆

Connecting a Noise Filter to Input Side (Primary Side)

Drive outputs generate noise as a result of high-speed switching. This noise flows from inside the drive back to
the power supply, possibly affecting other equipment. Installing a noise filter to the input side of the drive can
reduce the amount of noise flowing back into the power supply. This also prevents noise from entering the drive
from the power supply.
• Use a noise filter specifically designed for drives.
• Install the noise filter as close as possible to the drive.
A - Power supply
B - Input side (primary side) noise
filter
Note:
The model of the input side (primary side) noise filter is LNFD-xx.
Figure 2.68 Example of Connection of Noise Filter on Input Side (Primary Side)
◆

Connecting a Noise Filter to (Secondary Side)

A noise filter on the output side of the drive reduces inductive noise and radio frequency interference.
The following figure illustrates an example of output-side noise filter wiring.
NOTICE: Do not connect phase-advancing capacitors or LC/RC noise filters to the output circuits. Failure to comply could
damage the drive, phase-advancing capacitors, LC/RC noise filters or RCM/RCD.
A - Power supply
B - Drive
Figure 2.69 Example of Connection of Noise Filter on Output Side (Secondary Side)
Note:
Glossary
Radio frequency interference: Electromagnetic waves radiated from the drive and cables create noise throughout the radio bandwidth
that can affect surrounding devices.
Inductive noise: Noise generated by electromagnetic induction can affect the signal line and may cause the controller to malfunction.
YASKAWA ELECTRIC SIEP C710617 01B YASKAWA AC Drive GA700 Technical Manual
C - Drive
D - Other controller
C - Noise filter on output side
(secondary side)
D - Motor

2.22 Reducing Noise

93
2