12 EMC NICE3000
new
User Manual
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12.9 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.
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.
● For tripping at the moment of power-on, cut off the large capacitor to ground on the
power input side by disconnecting the grounding side of the external or built-in lter and
disconnecting the 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 leakage current lter, install safety capacitor + wind
magnetic ring, 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 differential cable.
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 0.11 uF capacitance is suggested.
Enlarge the capacitance at the AI. A maximum of 0.22 uF is suggested.
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