Omron 3G3FV-PDRT1-SIN user manual Noise Prevention for Peripheral Devices

CompoBus/D Communications Line Design Chapter 2

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	Surge suppressor
(Installed next to device)	(Installed next to device)

DC input type	Device	AC input type	Device
	(such as a motor)		(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.

Device

(such as a motor)

Ferrite core 0443-1641151

Nisshin Electric Co, Ltd.

•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.

T-branch Tap or Power Supply Tap or Communications Connector

Master

PS Slave

Master

Power Supply Tap

PS Slave

Ground at only one point

Power Supply Tap

PS Slave PS

When there is only one power supply When there are two or more power supplies

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