5.1 Standard RS-485 Communications Ports
5-17
Chap. 5 USING STANDARD RS-485
(2) Measures on side generating noise
Carrier frequency:
It is possible to lower the noise level by lowering the setting of function code
F26 [Motor operation noise (carrier frequency)]. However, be aware that
lowering the carrier frequency can result in higher levels of noise from other
sources.
Equipment:
It is possible to contain noise (radiation/inductance) by passing the power wires
through a metal duct or using a metal control panel.
Isolated power
supply:
It is possible to curb the propagation of noise (conductance) by using an
isolated transformer for the inverter power supply.
(3) Measures to lower noise level
Consider using a zero-phase reactor (9.6.5) and an EMC filter (9.6.2). Normally, you should
consider measure (3) if measures (1) and (2) do not lower the noise to the allowable level for the
equipment.
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