Countermeasures Against Noise - YASKAWA SGD7S-1R9D Product Manual

4.1.2

Countermeasures against Noise

The SERVOPACK is designed as an industrial device. It therefore provides no measures to pre-
vent radio interference. The SERVOPACK uses high-speed switching elements in the main circuit.
Therefore peripheral devices may be affected by switching noise.
Important
If the equipment is to be used near private houses or if radio interference is a problem, take

countermeasures against noise.

The SERVOPACK uses microprocessors. Therefore, it may be affected by switching noise from
peripheral devices.
To prevent the noise from the SERVOPACK or the peripheral devices from causing malfunc-
tions of any devices, take the following countermeasures against noise as required.
• Install the input reference device and Noise Filter as close to the SERVOPACK as possible.
• Always install a Surge Absorber for relays, solenoids, and Magnetic Contactor coils.
• Do not place the following cables in the same duct or bundle them together. Also, separate
the cables from each other by at least 30 cm.
•Main Circuit Cables and I/O Signal Cables
•Main Circuit Cables and Encoder Cables
• Do not share the power supply with an electric welder or electrical discharge machine. If the
SERVOPACK is placed near a high-frequency generator, install Noise Filters on the input side
on the Main Circuit Power Supply Cable and Control Power Supply Cable even if the same
power supply is not shared with the high-frequency generator. Refer to the following section
for information on connecting Noise Filters.
Noise Filters on page 4-6
• Implement suitable grounding measures. Refer to the following section for information on
grounding measures.
4.1.3 Grounding on page 4-8
4.1 Wiring and Connecting SERVOPACKs
4.1.2 Countermeasures against Noise
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