3.14 Decrease Noise
122 YASKAWA SIEPC71061737B GA800 Drive Technical Reference
3.14 Decrease Noise
Note:
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.
◆ 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
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
C - Drive
D - Other controller
Note:
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)
◆ 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 3.78 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
B - Drive
C - Noise filter on output side
(secondary side)
D - Motor
Figure 3.78 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.
To Next Page
Loading...
