SSINVERTER SSI700, User Manual, Page: 136 / 148

SSI700 User Manual EMC
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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.
Solution Interference Type
• 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.
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 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.
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 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.
Communication
interference
• Enlarge the capacitance at the low-speed DI. A maximum of 0.11uF
capacitance is suggested.
• Enlarge the capacitance at the AI. A maximum of 0.22 uF is
Suggested.
I/O interference