Appendix A Foreign Standards
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347
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A.7 Solutions to EMC Interference
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.
Table A-1 Typical EMC interference problems and solutions
Interference Type Solution
ELCB tripping
◆
Reduce the carrier frequency.
◆
Shorten the length of the controller cables.
◆
Wind a magnetic ring around the controller input cables except the
PE cable.
◆
to ground on the power input side by disconnecting the grounding
grounding side of the Y capacitor to ground of the input terminals.
◆
For tripping during controller running or when controller is
enabled, take leakage current suppression measures (install a
wind magnetic ring).
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.
◆
Wind the power input cables with a magnetic ring.
◆
Add a safety capacitor or magnetic ring to the interfered signal
terminal.
◆
Add an extra 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.
◆
Wind the power input cable with magnetic rings.
◆
Add a termination resistor between the communication cable
source and the load side.
◆
Add a common grounding cable besides the communication
◆
Use a shielded cable as the communication cable and connect the
cable shield to the common ground.
◆
Adopt daisy chain mode for multi-node communication and
reserve branch length of less than 30 cm.
I/O interference
◆
Enlarge the capacitance at the low-speed DI. A maximum of 0.1 uF
capacitance is suggested.
◆
Enlarge the capacitance at the AI. A maximum of 0.22 uF is
suggested.
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