3 Wiring and Connection
3.10.1 Wiring for Noise Control
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3.10 Noise Control and Measures for Harmonic Suppression
This section describes the wiring for noise control and the DC reactor for harmonic suppression.
3.10.1 Wiring for Noise Control
The SERVOPACKs and converters use microprocessors. Therefore it may receive switching noise from
peripheral devices.
To prevent the noise from a SERVOPACK, converter, 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 a SERVOPACK or converter 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. If the SERVOPACK
is placed near equipment that generates high-frequency noise, install a noise filter on the input side of the
main circuit power supply cables and control power supply cables, even if the same power supply is not
used. 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.
• Because the SERVOPACKs and converters are designed as an industrial device, it
provides no mechanism to prevent noise interference.
• The SERVOPACKs and converters use 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 countermea-
sures against noise.
• If installation conditions by the EMC directive must be met, refer to 2.4 EMC Installa-
tion Conditions in
Σ
-V User’s Manual for Use with Large-Capacity Models Setup Rota-
tional Motor (No.: SIEP S800000 89).
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