Solutions to Common EMC Interference Problems
‑123‑
Step
Solution
5
Increase the capacitor filter at the low‑speed DI. The
recommended maximum value is 0.1 uF. The required capacitor
voltage withstanding level is 50 V and above.
6
Increase the capacitor filter at the AI. The recommended
maximum value is 0.22 uF. The required capacitor voltage
withstanding level is 50 V and above.
7
Add a magnetic buckle to the signal cable, or wind the signal
cable on the magnetic ring for one to two turns.
8
Use a shielded power cable and ground the shielding layer
securely.
9
Try to remove the grounding screw on the control board. For
details, see "
3.4.2 Grounding of the Control Board
"
on page
89Grounding of the Control Board
.
6.4 Communication Interference
6.4.1 RS485 and CAN Communication Interference
Make rectification according to the following table.
Step
Solution
1
Add a 120 Ω termination resistor at both ends of the bus.
2
Use the multi‑core shielded twisted‑pair (STP) instead, and
ground the shielding layer at both ends.
3
Separate the communication cable and power cable at a distance
of at least 30 cm.
4
For multi‑node communication, adopt the daisy chain mode.
5
For multi‑node communication, add an equipotential bonding
wire between the nodes.
6
Add a magnetic buckle at both ends of the communication cable,
or wind the communication cable on the magnetic ring for one to
two turns.
7
Wind the output U/V/W cables of the AC drive on a magnetic ring
for two to four turns.
8
Use a shielded power cable and ground the shielding layer
securely.
6.4.2 EtherCAT and PROFINET Communication Interference
Make rectification according to the following table.
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