EMC: Wiring for Duet 2 Ethernet
I developed a system with 7 stepper motors and wanted to share my results according EMC.
In the picture below you can see the drawing of the motor cables i used for the EMC Test and the results (courtesy of Bureau Veritas CPS Germany GmbH). The pigtails of the cables are screwed into the steel plate, directly next to the Duet-Board. With this setup I got the best results in the laboratory (test method EN 55016-2-3:2017) and stayed below 40 dBμV/m / 47 dBμV/m, which is necessary for industrial machines.
Of course you allways have to make your own EMC tests, but maybe this information is helpful for somebody.
Thanks for sharing! It's common to need to take EMC precautions with stepper motor cables when the machine as a whole is not shielded.
On the Duet 3 MB6HC, EXP3HC and Duet 3 Mini we added additional components on the board to reduce EMI from stepper cables, so in some cases no additional precautions will be required.