Solutions To Common EMC Problems
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10.3 I/O Signal Interference
10.3.1High-speed Pulse Interference
Take the following measures to eliminate interference.
Step Measure
1
Used shielded twisted pairs and ground both ends.
2
Connect the motor enclosure to the PE terminal of the drive.
3
Connect the PE terminal of the drive to that of the power grid.
4
Add equipotential bonding grounding cables between the host
controller and drive.
5
Route signal cables and power cables through different routes at a
distance of at least 30 cm.
6
Install the magnetic buckle to the signal cable or wind the signal
cable around the magnetic ring for one or two turns.
7
Install the magnetic ring to the U, V, and W cables of the drive, and
wind the cables around the magnetic ring for two to four turns.
8
Use shielded power cables with the shield grounded properly.
10.3.2Common I/O Signal Interference
The drive generates strong interference during operation, which may interfere with
other devices due to improper wiring or grounding. When the drive interferes with or
is interfered by other devices, adopt the following measures.
No.
Solution
1
Use shielded I/O signal cables with the shield connected to the PE
terminal.
2
Connect the PE terminal of the motor to that of the drive, and
connect the PE terminal of the drive to that of the power grid.
3
Add an equipotential bonding grounding cable between the host
controller and the AC drive.
4
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.
5
Increase the capacitance at the low‑speed DI. A maximum of 0.1 uF
capacitance is recommended.
6
Increase the capacitance at the AI. A maximum of 0.22 uF is
recommended.
7
Install a ferrite clamp or a magnetic ring to the signal cable and
wind the signal cable for one to two turns.
8
Use a shielded power cable and ground the shield securely.
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