SMC Networks LECYU Series, Operation Manual

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3 Wiring and Connection
3-31
3.8 Noise Control and Measures for Harmonic Suppression
This section describes the wiring for noise control and the DC reactor for harmonic suppression.
3.8.1 Wiring for Noise Control
• Because the DRIVER is designed as an industrial device, it provides no mechanism
to prevent noise interference.
• The DRIVER uses high-speed switching elements in the main circuit. Therefore
peripheral devices may receive switching noise. If the equipment is to be used near
private houses or if radio interference is a problem, take countermeasures against
noise.
• If installation conditions by the EMC directive must be met, refer to 3.8.3
EMC
Installation Conditions .
The DRIVER uses microprocessors. Therefore it may receive switching noise from peripheral devices.
To prevent the noise from the DRIVER or the peripheral devices from causing a malfunction of any one of these devices,
take the following precautions against noise as required.
•
Position the input reference device and noise filter as close to the DRIVER 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
the same duct. Keep the main circuit cables separated from the I/O signal cables and the encoder cables
with a gap of at least 30 cm.
•
Do not share the power supply with an electric welder or electrical discharge machine. When the DRIVER
is placed near a high-frequency generator, install a noise filter on the input side of the main circuit power
supply cables and control power supply cables. As for the wiring of noise filter, refer to
(1) Noise Filter
shown below.
•
Take the grounding measures correctly. As for the grounding, refer to (2) Correct Grounding.