Decrease Noise; Connect A Noise Filter To The Input Side (Primary Side); Connect A Noise Filter To The Output Side (Secondary Side) - YASKAWA CR700 Technical Manual

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2.22 Decrease Noise

High-speed switching makes noise in the drive output. This noise flows from the drive to the power supply, and

can possibly 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 also prevents 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

The input side (primary side) noise filter model is LNFD-xx.

Figure 2.146 Example of Connecting the Noise Filter on the Input Side (Primary Side)

A noise filter on the output side of the drive decreases inductive noise and radio frequency interference.

Figure 2.147

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

Figure 2.147 Example of Connecting the Noise Filter on the Output Side (Secondary Side)

• 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.

Prevent Inductive Noise

In addition to installing a noise filter, you can also run all wiring through a grounded metal conduit to decrease

inductive noise occurring at the output side. Put the cables a minimum of 30 cm (11.8 in) away from the signal

line to prevent induced noise. Ground the cables to metal conduits.

D - Other controller

C - Noise filter on output side (secondary side)

YASKAWA SIEPC71061723A YASKAWA AC Drive CR700 Technical Manual