Decrease Noise; Connect A Noise Filter To The Input Side (Primary Side); Connect A Noise Filter To The Output Side (Secondary Side) - YASKAWA GA80U4720ABM Manual

Table of Contents

3.14 Decrease Noise

The main circuit terminal block for the drive and the terminal block for the noise filter come in different shapes. The drive has a European-

style terminal block and the noise filter has a circular terminal block. Use caution when you prepare the ends of the wires.

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

• 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 3.77 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.

shows an example of noise filter wiring.

NOTICE: Do not connect phase-advancing capacitors, LC/RC noise filters, or leakage breakers (GFCI) 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 3.78 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

• Inductive noise:

The noise from electromagnetic induction can have an effect on the signal line and can cause the controller to malfunction.

D - Other controller

C - Noise filter on output side

(secondary side)

YASKAWA SIEPC71061737B GA800 Drive Technical Reference