EMC
MD380 User Manual
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7.5 Solutions to Common EMC Interference Problems
The AC drive generates very strong interference. Although EMC measures are taken, the
interference may still exist due to improper cabling or grounding during use. When the AC
drive interferes with other devices, adopt the following solutions.
Interference Type Solution
Leakage protection
switch tripping
• Connect the motor housing to the PE of the AC drive.
• Connect the PE of the AC drive to the PE of the mains power supply.
• Add a safety capacitor to the power input cable.
• Add magnetic rings to the input drive cable.
AC drive interference
during running
• Connect the motor housing to the PE of the AC drive.
• Connect the PE of the AC drive to the PE of the mains voltage.
• Add a safety capacitor to the power input cable and wind the cable
with magnetic rings.
• Add a safety capacitor to the interfered signal port or wind the
signal cable with magnetic rings.
• Connect the equipment to the common ground.
Communication
interference
• Connect the motor housing to the PE of the AC drive.
• Connect the PE of the AC drive to the PE of the mains voltage.
• Add a safety capacitor to the power input cable and wind the cable
with magnetic rings.
• Add a matching resistor between the communication cable source
and the load side.
• Add a common grounding cable besides the communication cable.
• Use a shielded cable as the communication cable and connect the
cable shield to the common grounding point.
I/O interference
• Enlarge the capacitance at the low-speed DI. A maximum of 0.11
uF capacitance is suggested.
• Enlarge the capacitance at the AI. A maximum of 0.22 uF is
suggested.
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