Inovance MD500-PLUS Series - Control Circuit Interference; High-Speed Pulse Interference; Common I;O Signal Interference

Troubleshooting for Common EMC Interference Problems
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9.4 Control Circuit Interference
9.4.1 High-Speed Pulse Interference
Follow the following table for troubleshooting.
Step
Action
1
Use a shielded twisted‑pair cable and ground it at both ends.
2
Connect the motor enclosure to the PE terminal of the AC drive.
3
Connect the PE terminal of the AC drive to the PE terminal of the
grid.
4
Add an equipotential bonding grounding wire between the host
controller and the AC drive.
5
Separate the signal cable from the power cable by a distance of at
least 30 cm.
6
Add a ferrite clamp to the signal cable, or wind the signal cable on a
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 ensure that the shield is well‑
grounded.
9.4.2 Common I/O Signal Interference
The AC drive generates very strong interference. Despite EMC measures taken, the
interference may still exist due to improper routing or grounding. When the AC drive
interferes with other equipment, follow the following table for troubleshooting.
Step
Action
1
Use shielded cables as the I/O signal cables, with the shield
connected to the PE terminal.
2
Reliably connect the PE terminal of the motor to the PE terminal
of the AC drive, and connect the PE terminal of the AC drive to the
PE terminal of the grid.
3
Add an equipotential bonding grounding wire between the host
controller and the AC drive.
4
Wind the output U/V/W cables of the AC drive on a magnetic ring
for two to four turns.
5
Increase capacitance at low‑speed DI. The upper limit of
capacitance is 0.1 μF.
6
Increase capacitance at AI. The upper limit of capacitance is 0.22
μF.