Control board causes interference via USB

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Softfoot
Posts: 21
Joined: Tue Oct 01, 2019 6:42 pm

Control board causes interference via USB

Post by Softfoot » Sun Nov 03, 2019 10:21 am

When I have my I3 Pro C with a GT2560 A+ controller connected to my PC via USB I see lines of interference running up the monitor !!
Its almost like mains hum.

If I power down the printer or unplug the USB it disapears.

I tried removing F2 from the controller but it made no difference (it did stop the controller being powered from the PC which seems a good idea).

The printer and the PC and the LCD monitor are all plugged into the same wall socket.

Any suggestions ??
Could it be a ground loop ??

TIA,
Dave

Jarda3d
Posts: 184
Joined: Sat Jan 26, 2019 8:42 am

Re: Control board causes interference via USB

Post by Jarda3d » Mon Nov 04, 2019 7:26 am

Use the same 230V outlet for all devices. Check that your home power lines are safety grounded. Check that you are away from RF communication devices or from running microwave oven behind the wall.
A10M Slic3r profile: here and fresh on github (lot of tips here)
A10 Slic3r profile: here
TIP: tight all screws and wheels (except right side of Z axis) and re-align frame while assembly. And silence it.

Softfoot
Posts: 21
Joined: Tue Oct 01, 2019 6:42 pm

Re: Control board causes interference via USB

Post by Softfoot » Wed Nov 06, 2019 7:26 am

They are all plugged into the same outlet and are all fully grounded at least as far as the plug is concerned.

A USB isolator solves the problem so I suspect it is a ground loop of some sort.

I note that the mains earth onthe Greeetech supplied PSU is not connected to the case of the PSU or the black ground wires on the 12V output wgich seems a bit odd.

Dave

Jarda3d
Posts: 184
Joined: Sat Jan 26, 2019 8:42 am

Re: Control board causes interference via USB

Post by Jarda3d » Thu Nov 07, 2019 4:08 am

It could be problem with the mains cable too, try to change it.

Check with multimeter beep test grounding of frame to GND socket, and GND to PE socket.

You need to solve it for safety reasons.
A10M Slic3r profile: here and fresh on github (lot of tips here)
A10 Slic3r profile: here
TIP: tight all screws and wheels (except right side of Z axis) and re-align frame while assembly. And silence it.

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