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2-4-5 Noise Prevention for Peripheral Devices
• Install surge suppressors on devices that generate noise, particularly devices that have an inductive
component such as motors, transformers, solenoids, and magnetic coils.
Surge suppressor
(Installed next to device)
DC input type Device
(such as a motor)
AC input type
Surge suppressor
(Installed next to device)
Device
(such as a motor)
• If a surge suppressor does not fit on the device, installing a ferrite core directly next to the device’s
contactors, such as a contactor may be effective.
Ferrite core 0443-1641151
Nisshin Electric Co, Ltd.
Device
(such as a motor)
• Insert a line filter on the primary side of the communications power supply.
• When there are two or more communications power supplies, the communications power cables can
be grounded by simply connecting a single Power Supply Tap near the center of the communications
cable. Do not ground shielding wire at more than one place.
Master
T-branch Tap or Power Supply Tap
or Communications Connector
Slave
Ground at only one point
When there is only one power supply When there are two or more power supplies
PS
PS PS PS
Master
Slave Slave Slave
Power Supply Tap Power Supply Tap
CompoBus/D Communications Line Design Chapter 2