Hello,

I recently finished building my controller for a DIY router machine (image attached).

I am using 3x these closed loop steppers: https://www.omc-stepperonline.com/cl...5Bnema%2024%5D
When they arrived I noticed that the motor cable was not shielded.
I made my own shielded cable assembly for one of the motors, but I am getting some very strange behavior with this (strange for me at least...)

When I connect the drain wire from that cable to my ground terminal (controller side) and power-on the system the stepper makes a loud whiny noise and nothing really works.
Any ideas what might be happening ?

Thanks in advance!!