Solutions To Common EMC Problems
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10.4 Communication Interference
10.4.1RS485 and CAN Communication Interference
Obverse the following steps for troubleshooting.
No. Step
1
Install a 120 Ω termination resistor at both ends of the bus.
2
Replace with multi‑conductor shielded twisted pair cables and
ground both ends of the shield.
3
Separate communication cables from power cables with a distance
of at least 30 cm.
4
Adopt the daisy chain mode for multi‑node communication cabling.
5
For multi‑node communication, add an equipotential bonding
grounding cable between nodes.
6
Add a ferrite clamp at both ends of the communication cable or add
a magnetic ring at both ends of the communication cable and wind
the communication cable through the magnetic ring for one to two
turns.
7
Install a magnetic ring to the U, V, and W output cables at the drive
side and wind the cables through the magnetic ring for two to four
turns.
8
Use shielded power cables and ground the shield properly.
10.4.2EtherCAT and PROFINET Communication Interference
Take the measures listed in the following table.
No.
Description
1
Check that the communication network cables meet the
specification requirements for shielded Cat 5e cables.
2
Check that the communication port cable is connected properly.
3
Separate the communication cable from the power cable by a
distance of at least 30 cm.
4
For multi‑node communication, add an equipotential bonding
grounding cable between nodes.
5
Check that the cable between two nodes is no longer than 100 m in
length.
6
Install the ferrite clamp on both sides of the communication cable
and wind the cable around the ferrite clamp by one or two turns.
7
Install a magnetic ring to the U, V, and W output cables at the drive
side and wind the cables through the magnetic ring for two to four
turns.
8
Use a shielded power cable and ground the shield securely.
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