# Onefinity Controller Stopping Mid-Program (solved: EMI / Static Build up)

**URL:** <https://forum.onefinitycnc.com/t/onefinity-controller-stopping-mid-program-solved-emi-static-build-up/9041>\
**Category:** Controller (Buildbotics) Discussion\
**Created:** [November 20, 2021, 7:39pm UTC](https://forum.onefinitycnc.com/t/onefinity-controller-stopping-mid-program-solved-emi-static-build-up/9041 "2021-11-20T19:39:44Z")\
**Posts on this page:** 1\
**Showing post:** 8

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**Author:** ![TheyCallMeJohn](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.onefinitycnc.com/theycallmejohn/32/7657_2.png) [@TheyCallMeJohn](https://forum.onefinitycnc.com/u/TheyCallMeJohn)\
**Post date:** [January 3, 2022, 3:42pm UTC](https://forum.onefinitycnc.com/t/onefinity-controller-stopping-mid-program-solved-emi-static-build-up/9041/8 "2022-01-03T15:42:45Z")

</div>

I hope this is my issue as well. I had I randomly shut down Saturday night 2.5 hours into a carved I grounded the table (it is an old drafting table so it has metal frame which the controller is screwed too.)

I also grounded all the dust collection back to the unit.

 ![IMG_8863](https://us1.discourse-cdn.com/flex022/uploads/onefinitycnc/original/3X/2/3/23a4fcadf0cba9cc5fc7ff7b72eb823f423eab47.jpeg)

 ![IMG_8870](https://us1.discourse-cdn.com/flex022/uploads/onefinitycnc/original/3X/3/e/3e6176562ce22030fc1969b9b98ec3c9af4d01a2.jpeg)

 ![IMG_8864](https://us1.discourse-cdn.com/flex022/uploads/onefinitycnc/original/3X/6/7/671f810b7b07f9418e4aa5007d912d5186d85f5b.jpeg)

 ![IMG_8869](https://us1.discourse-cdn.com/flex022/uploads/onefinitycnc/original/3X/3/7/3785b875cc40070ad8b64f07f011908582298816.jpeg)

 ![IMG_8868](https://us1.discourse-cdn.com/flex022/uploads/onefinitycnc/original/2X/d/dd3ebffa212005549bc6934f75dd32359129fbd8.jpeg)

In the last picture you can see I have a grounding point at the stepper, when I connected this ground, the motor started making a humming clicking noise. I disconnected it before operation but it was concerning as I wanted to ground the rails. Hopefully someone more knowledgeable than I could explain this.

Also I should I note that my controller was already fed via a UPS on a separate protected circuit.

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