3.8 Noise Control and Measures for Harmonic Suppression3-333 Wiring and Connection3.8 Noise Control and Measures for Harmonic SuppressionThis section describes the wiring for noise control and the DC reactor for harmonic suppression.3.8.1 Wiring for Noise ControlThe SERVOPACK uses microprocessors. Therefore it may receive switching noise from peripheral devices.To prevent the noise from the SERVOPACK or the peripheral devices from causing a malfunction of any oneof these devices, take the following precautions against noise as required.• Position the input reference device and noise filter as close to the SERVOPACK as possible.• Always install a surge absorber in the relay, solenoid and electromagnetic contactor coils.• Do not bundle or run the main circuit cables together with the I/O signal cables or the encoder cables in thesame duct. Keep the main circuit cables separated from the I/O signal cables and the encoder cables with agap of at least 30 cm.• Do not use the same power supply as electric welders, electrical discharge machines, and similar devices. Ifthe SERVOPACK is placed near equipment that generates high-frequency noise, install a noise filter on theinput side of the main circuit power supply cable and control power supply cable, even if the same powersupply is not used. Refer to (1) Noise Filter for the noise filter connection method.• Take the grounding measures correctly. As for the grounding, refer to (2) Correct Grounding.• Because the SERVOPACK is designed as an industrial device, it provides no mecha-nism to prevent noise interference.• The SERVOPACK uses high-speed switching elements in the main circuit. Thereforeperipheral devices may receive switching noise. If the equipment is to be used nearprivate houses or if radio interference is a problem, take countermeasures againstnoise.• If installation conditions by the EMC directive must be met, refer to 2.4 EMC Installa-tion Conditions inΣ-V Series User's Manual Setup Rotational Motor (No.: SIEPS800000 43).
