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

[Aiph5u (Aiph5u (not affiliated with Onefinity))]

Hey John,

@TheyCallMeJohn

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.

You can check if it is this issue the following way if you have a Multimeter:

1. Unplug all power from the machine (shut down the Controller properly before).

2. Disconnect all ground wires from the metal parts of the machine. If you use a spindle, or a grounded milling motor, unplug it.

3. Set Multimeter to “Resistance/Ohms” and attach one measuring tip to the machine (e.g. machine’s foot; ensure good connection on metal).

4. At the connector on the CNC Controller case, unplug the plug coming from the stepper motor which makes the noise.
   

   

5. On the cable you just unplugged from the Controller, you see a four-contact Amphenol/Molex Plug:

@mkngjoy

5. Stick the other measuring tip of the Multimeter into one of these four contacts of the stepper cable plug.
   It should measure no resistance.
6. Repeat with remaining three contacts of the plug. If any of these show a low resistance, you seem to have a short between a stepper wire and the rail. If this is the case, you can watch the video Support : How to Access the inner tube motor wire and check if you find it.