9.5 Solutions to Common EMC Interference Problems
The controller generates very strong interference. Although EMC measures are taken,
the interference may still exist due to improper cabling or grounding during use. When the
controller interferes with other devices, adopt the following solutions.
Interference Type Solution
Leakage protection
switch tripping
•
Connect the motor housing to the PE of the controller.
•
Connect the PE of the controller 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.
Controller
interference during
running
•
Connect the motor housing to the PE of the controller.
•
Connect the PE of the controller 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 controller.
•
Connect the PE of the controller 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.
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