9.1 Overview of RS-485 Communication
9.1.5 RS-485 noise suppression
Depending on the operating environment, the malfunction may occur due to the noise generated by the inverter.
Possible measures to prevent such malfunction are: separating the wiring, use of shielded cable, isolating the
power supply, and adding an inductance component. The description shown below is an example of adding an
inductance.
Refer to the RS-485 Communication User’s Manual, Chapter 2, Section 2.2.4 “Precautions for long wiring
(between inverter and motor)” for details.
Adding inductance components
Keep the impedance of the signal circuit high against the high-frequency noises by inserting an inductance
component, such as by inserting a choke coil in series or passing the signal line through a ferrite core.
RS-485 communications cable
Pass the wiring through the ferrite core or
wind the ferrite core with the wiring a few times
Fig. 9.1-3 Adding an inductance component
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