Appendix 2 Common EMC Problems and Solutions
‑154‑
Figure 6‑2 I/O signal cables with capacitance increased
6.4 RS485&CAN Communication Interference
Take the measures listed in the following table to suppress interference.
No. Measure
1
Install a 120 Ω termination resistor on each end 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 daisy chain mode for multi‑node communication layout.
5
Add an equipotential bonding grounding cable between nodes during multi‑node
communication (see “
Cabinet system grounding
”
on page 95
).
6
Install ferrite clamps on both sides of the communication cable or wind the
magnetic ring by one or two turns (see “
Figure 2–21
”
on page 54
).
7
Install the magnetic ring on the output side (UVW) of the servo drive by two to four
turns (see “
Figure 2–20
”
on page 53
).
8
Use shielded power cables and ground the shield properly.
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